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#17515 From: "Olivier" <ilgalla@...>
Date: Sun Nov 15, 2009 8:56 am
Subject: Re: RKSB - 104 Right switch 		oli_flickr
Offline Offline
Send Email Send Email
  
--- In GeigerCounterEnthusiasts@yahoogroups.com, "Sicurezza Torre WTC"
<torre.wtc@...> wrote:
> SI. The sound is not so loud but just a clik.

Just to be clear, you connected the piezo between the emitter pin of component
VT1 (in the schemathics) and ground? Grazie!

Reply | Forward | Messages in this Topic (6)
#17514 From: "arthurok" <arthurok@...>
Date: Sun Nov 15, 2009 2:08 am
Subject: Re: Looking for VCR tape storage case 		arthurok_2000
Online Now Online Now
Send Email Send Email
 
try  e  bay
----- Original Message -----
From: Geo>K0FF
Sent: Saturday, November 14, 2009 11:06 AM
Subject: [GeigerCounterEnthusiasts] Looking for VCR tape storage case

 

These are the clear or semi clear individual storage cases that VCR size tapes fit into for protection. They also make goo boxes for electronic projects. Once available cheap everywhere, now can't find them. Need 2 or 3 dozen for school Geiger projects.
 
Geo


Reply | Forward | Messages in this Topic (3)
#17513 From: "arthurok" <arthurok@...>
Date: Sun Nov 15, 2009 1:56 am
Subject: Re: Re: Zerners 		arthurok_2000
Online Now Online Now
Send Email Send Email
 
right  sir  because    the  bulbs   will  be effectively running  at      full  rms    voltage  
at  50%  duty  cycle
----- Original Message -----
From: robert8rpi
Sent: Saturday, November 14, 2009 10:28 AM
Subject: [GeigerCounterEnthusiasts] Re: Zerners

 

Hi Arthur,
This would be about right if we were trying to run lamps at half brightness fron their rated voltage, but we are trying to run full brightness from twice the supply voltage so 50% is correct. A small adjustmaent would be a good idea to tweak the voltage.

Regards,
Robert G8RPI.

--- In GeigerCounterEnthusiasts@yahoogroups.com, "arthurok" <arthurok@...> wrote:
>
> because they are lamp filaments a 50% duty cycle wont provide exactly half brightness. i think more like a 30% dutycycle is correct
> ----- Original Message -----
> From: robert8rpi
> To: GeigerCounterEnthusiasts@yahoogroups.com
> Sent: Friday, November 13, 2009 2:56 PM
> Subject: [GeigerCounterEnthusiasts] Re: Zerners
>
>
>
> Hi,
> A voltage converter won't work well as you need one for each line to the trailer, Side lights, brake lights, numberplate light etc.
> Zeners will work but you need big ones. Simple math zenner voltage = 14V, zenner power = total lamp wattage on that line. Here in the UK brake lights are 21W each so you would need a 45W or 50W zenner for just that line. This would not be practical unless you can find some surplus high power diodes. Easiest solution is to change the bulbs to 24V ones!
> If you have electronic abilities you could put a cheap MOSFET (e.g IRF510) in each line with all the gates being driven by a 50% duty cycle squarewave. This will give half the power out and will work fine with filament lamps. No need for big heatsinks either. You could buld this into an adaptor lead.
>
> Robert G8RPI.
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@ wrote:
> >
> > Hi all I know that this is not the correct group to ask this question
> > really but after belonging to it for a long time with the great minds that are
> > here I figure some of you will have a simple answer. So here it is I have a
> > military truck with a 24 volt dc system, what do I need to make up to my
> > trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ?
> > if so what size ? any ideas please let me know. Thankyou, Mark
> >
>


Reply | Forward | Messages in this Topic (19)
#17512 From: "Sicurezza Torre WTC" <torre.wtc@...>
Date: Sat Nov 14, 2009 7:18 pm
Subject: Re: Re: RKSB - 104 Right switch 		happynewlaser
Offline Offline
Send Email Send Email
 
SI. The sound is not so loud but just a clik.
----- Original Message -----
From: Olivier
Sent: Saturday, November 14, 2009 7:53 PM
Subject: [GeigerCounterEnthusiasts] Re: RKSB - 104 Right switch

 



--- In GeigerCounterEnthusiasts@yahoogroups.com, "Sicurezza Torre WTC" <torre.wtc@...> wrote:
> I connected my piezo just in the output of the first cmos after the detection. Unfortunately it is in the lower pcb so you hve to dismount. The sound is not so loud but in normal enviroment the clik is enought.

Thank you for the information. I did not yet dismount the two PCBs, but as soon as i do it, i will try your solution for the piezo speaker (sound simpler than mine). I used an op-amp as a comparator reading the signal from pin 4 (counting clockwise) of the rear connector.
Are you italian? I am.

Olivier


Reply | Forward | Messages in this Topic (6)
#17511 From: "Olivier" <ilgalla@...>
Date: Sat Nov 14, 2009 6:53 pm
Subject: Re: RKSB - 104 Right switch 		oli_flickr
Offline Offline
Send Email Send Email
  
--- In GeigerCounterEnthusiasts@yahoogroups.com, "Sicurezza Torre WTC"
<torre.wtc@...> wrote:
> I connected my piezo just in the output of the first cmos after the detection.
Unfortunately it is in the lower pcb so you hve to dismount. The sound is not so
loud but in normal enviroment the clik is enought.

Thank you for the information. I did not yet dismount the two PCBs, but as soon
as i do it, i will try your solution for the piezo speaker (sound simpler than
mine). I used an op-amp as a comparator reading the signal from pin 4 (counting
clockwise) of the rear connector.
Are you italian? I am.

Olivier

Reply | Forward | Messages in this Topic (6)
#17510 From: "Geo>K0FF" <GEOelectronics@...>
Date: Sat Nov 14, 2009 5:06 pm
Subject: Looking for VCR tape storage case 		K0FF
Offline Offline
Send Email Send Email
 
These are the clear or semi clear individual storage cases that VCR size tapes fit into for protection. They also make goo boxes for electronic projects. Once available cheap everywhere, now can't find them. Need 2 or 3 dozen for school Geiger projects.
 
Geo

Reply | Forward | Messages in this Topic (3)
#17509 From: "Geo>K0FF" <GEOelectronics@...>
Date: Sat Nov 14, 2009 4:46 pm
Subject: Re: Re: Zerners 		K0FF
Offline Offline
Send Email Send Email
  
That is probably true but my way draws no current unless it is tasked. Geo
----- Original Message -----
From: "robert8rpi" <robert8rpi@...>
To: <GeigerCounterEnthusiasts@yahoogroups.com>
Sent: Saturday, November 14, 2009 10:24 AM
Subject: [GeigerCounterEnthusiasts] Re: Zerners


> Hi Geo,
> The advantage of the PWM circuit is reduced power consumption. Your
> circuit will work but will dissipate as much power again as the lamps. The
> PWM just has switching losses. One oscillator will drive all the MOSFETs.
> If you could easilly isolate the ground return then you could put a single
> MOSFET in the ground circuit.
>
> Robert G8RPI..
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, "Geo>K0FF"
> <GEOelectronics@...> wrote:
>>
>> how about a couple of 2N3055's driven by a 12V zener. As many as it takes
>> to
>> get the Amps needed. About 5 Amps each.  Geo
>> ----- Original Message -----
>> From: "robert8rpi" <robert8rpi@...>
>> To: <GeigerCounterEnthusiasts@yahoogroups.com>
>> Sent: Friday, November 13, 2009 2:56 PM
>> Subject: [GeigerCounterEnthusiasts] Re: Zerners
>>
>>
>> > Hi,
>> > A voltage converter won't work well as you need one for each line to
>> > the
>> > trailer, Side lights, brake lights, numberplate light etc.
>> > Zeners will work but you need big ones. Simple math zenner voltage =
>> > 14V,
>> > zenner power = total lamp wattage on that line. Here in the UK brake
>> > lights are 21W each so you would need a 45W or 50W zenner for just that
>> > line. This would not be practical unless you can find some surplus high
>> > power diodes. Easiest solution is to change the bulbs to 24V ones!
>> > If you have electronic abilities you could put a cheap MOSFET (e.g
>> > IRF510)
>> > in each line with all the gates being driven by a 50% duty cycle
>> > squarewave. This will give half the power out and will work fine with
>> > filament lamps. No need for big heatsinks either. You could buld this
>> > into
>> > an adaptor lead.
>> >
>> > Robert G8RPI.
>> >
>> > --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@ wrote:
>> >>
>> >> Hi all I know that this is not the correct group to ask this question
>> >> really but after belonging to it for a long time with the great minds
>> >> that are
>> >> here I figure some of you will have a simple answer. So here it is I
>> >> have
>> >> a
>> >> military truck with a 24 volt dc system, what do I need to make up to
>> >> my
>> >> trailer  pigtail to hook up to my 12 volt dc trailer like a zerner in
>> >> line ?
>> >> if so what  size ? any ideas please let me know. Thankyou,   Mark
>> >>
>> >
>> >
>> >
>> >
>> > ------------------------------------
>> >
>> > Yahoo! Groups Links
>> >
>> >
>> >
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Reply | Forward | Messages in this Topic (19)
#17508 From: "robert8rpi" <robert8rpi@...>
Date: Sat Nov 14, 2009 4:28 pm
Subject: Re: Zerners 		robert8rpi
Offline Offline
Send Email Send Email
  
Hi Arthur,
This would be about right if we were trying to run lamps at half brightness fron
their rated voltage, but we are trying to run full brightness from twice the
supply voltage so 50% is correct. A small adjustmaent would be a good idea to
tweak the voltage.

Regards,
Robert G8RPI.

--- In GeigerCounterEnthusiasts@yahoogroups.com, "arthurok" <arthurok@...>
wrote:
>
> because they  are  lamp filaments     a 50%   duty  cycle  wont provide
exactly half brightness.    i  think  more  like a 30%  dutycycle  is  correct
>   ----- Original Message -----
>   From: robert8rpi
>   To: GeigerCounterEnthusiasts@yahoogroups.com
>   Sent: Friday, November 13, 2009 2:56 PM
>   Subject: [GeigerCounterEnthusiasts] Re: Zerners
>
>
>
>   Hi,
>   A voltage converter won't work well as you need one for each line to the
trailer, Side lights, brake lights, numberplate light etc.
>   Zeners will work but you need big ones. Simple math zenner voltage = 14V,
zenner power = total lamp wattage on that line. Here in the UK brake lights are
21W each so you would need a 45W or 50W zenner for just that line. This would
not be practical unless you can find some surplus high power diodes. Easiest
solution is to change the bulbs to 24V ones!
>   If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
in each line with all the gates being driven by a 50% duty cycle squarewave.
This will give half the power out and will work fine with filament lamps. No
need for big heatsinks either. You could buld this into an adaptor lead.
>
>   Robert G8RPI.
>
>   --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@ wrote:
>   >
>   > Hi all I know that this is not the correct group to ask this question
>   > really but after belonging to it for a long time with the great minds that
are
>   > here I figure some of you will have a simple answer. So here it is I have
a
>   > military truck with a 24 volt dc system, what do I need to make up to my
>   > trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line
?
>   > if so what size ? any ideas please let me know. Thankyou, Mark
>   >
>

Reply | Forward | Messages in this Topic (19)
#17507 From: "robert8rpi" <robert8rpi@...>
Date: Sat Nov 14, 2009 4:24 pm
Subject: Re: Zerners 		robert8rpi
Offline Offline
Send Email Send Email
  
Hi Geo,
The advantage of the PWM circuit is reduced power consumption. Your circuit will
work but will dissipate as much power again as the lamps. The PWM just has
switching losses. One oscillator will drive all the MOSFETs. If you could
easilly isolate the ground return then you could put a single MOSFET in the
ground circuit.

Robert G8RPI..

--- In GeigerCounterEnthusiasts@yahoogroups.com, "Geo>K0FF" <GEOelectronics@...>
wrote:
>
> how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
> get the Amps needed. About 5 Amps each.  Geo
> ----- Original Message -----
> From: "robert8rpi" <robert8rpi@...>
> To: <GeigerCounterEnthusiasts@yahoogroups.com>
> Sent: Friday, November 13, 2009 2:56 PM
> Subject: [GeigerCounterEnthusiasts] Re: Zerners
>
>
> > Hi,
> > A voltage converter won't work well as you need one for each line to the
> > trailer, Side lights, brake lights, numberplate light etc.
> > Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> > zenner power = total lamp wattage on that line. Here in the UK brake
> > lights are 21W each so you would need a 45W or 50W zenner for just that
> > line. This would not be practical unless you can find some surplus high
> > power diodes. Easiest solution is to change the bulbs to 24V ones!
> > If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> > in each line with all the gates being driven by a 50% duty cycle
> > squarewave. This will give half the power out and will work fine with
> > filament lamps. No need for big heatsinks either. You could buld this into
> > an adaptor lead.
> >
> > Robert G8RPI.
> >
> > --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@ wrote:
> >>
> >> Hi all I know that this is not the correct group to ask this question
> >> really but after belonging to it for a long time with the great minds
> >> that are
> >> here I figure some of you will have a simple answer. So here it is I have
> >> a
> >> military truck with a 24 volt dc system, what do I need to make up to my
> >> trailer  pigtail to hook up to my 12 volt dc trailer like a zerner in
> >> line ?
> >> if so what  size ? any ideas please let me know. Thankyou,   Mark
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>

Reply | Forward | Messages in this Topic (19)
#17506 From: "K0FF" <GEOelectronics@...>
Date: Sat Nov 14, 2009 3:12 pm
Subject: Re: Zerners 		K0FF
Offline Offline
Send Email Send Email
  
The circuit is here:
http://www.elecfree.com/circuit/power-supply/12-volt-30-amp-by-7812/

If there is an electric brake...........forget it. Too dangerous it might fail.

Geo

--- In GeigerCounterEnthusiasts@yahoogroups.com, "Geo>K0FF" <GEOelectronics@...>
wrote:
>
> how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
> get the Amps needed. About 5 Amps each.  Geo
> ----- Original Message -----
> From: "robert8rpi" <robert8rpi@...>
> To: <GeigerCounterEnthusiasts@yahoogroups.com>
> Sent: Friday, November 13, 2009 2:56 PM
> Subject: [GeigerCounterEnthusiasts] Re: Zerners
>
>
> > Hi,
> > A voltage converter won't work well as you need one for each line to the
> > trailer, Side lights, brake lights, numberplate light etc.
> > Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> > zenner power = total lamp wattage on that line. Here in the UK brake
> > lights are 21W each so you would need a 45W or 50W zenner for just that
> > line. This would not be practical unless you can find some surplus high
> > power diodes. Easiest solution is to change the bulbs to 24V ones!
> > If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> > in each line with all the gates being driven by a 50% duty cycle
> > squarewave. This will give half the power out and will work fine with
> > filament lamps. No need for big heatsinks either. You could buld this into
> > an adaptor lead.
> >
> > Robert G8RPI.
> >
> > --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@ wrote:
> >>
> >> Hi all I know that this is not the correct group to ask this question
> >> really but after belonging to it for a long time with the great minds
> >> that are
> >> here I figure some of you will have a simple answer. So here it is I have
> >> a
> >> military truck with a 24 volt dc system, what do I need to make up to my
> >> trailer  pigtail to hook up to my 12 volt dc trailer like a zerner in
> >> line ?
> >> if so what  size ? any ideas please let me know. Thankyou,   Mark
> >>
> >
> >
> >
> >
> > ------------------------------------
> >
> > Yahoo! Groups Links
> >
> >
> >
>

Reply | Forward | Messages in this Topic (19)
#17505 From: "Sicurezza Torre WTC" <torre.wtc@...>
Date: Sat Nov 14, 2009 8:58 am
Subject: Re: Re: Zerners 		happynewlaser
Offline Offline
Send Email Send Email
 

To give the correct answer , we should need the electrical wireing.  The simplest seems to be the parallel to series conversion . Limit are : you need a pair number of lamp in each circuit
You have to connect always to a 24vdc the trailer.
The total powe seems to be around 200w
2 stop light = 2x55
2x position light = 2x25
4x perimetral light= 4x5 
 
The cheaper seems to be the parallel to series conversion . Remember that each lamp is usually ground referred so may be is not so easy to make tehem in series
 
 
 
 
----- Original Message -----
From: wharpt@...
Sent: Saturday, November 14, 2009 2:00 AM
Subject: Re: [GeigerCounterEnthusiasts] Re: Zerners

 

Uhh, guys (and gals that may be out there) why not just wire a duplicate set of bulbs in series with the existing bulbs? Doesn't have to be mounted on the trailer, just in a box with the 24v leads coming in one side thru the bulbs and out to the 12 v trailer. Two 12V bulbs in series should equal 24V, right?
 
Wharpt
 
In a message dated 11/13/2009 3:57:48 P.M. Central Standard Time, GEOelectronics@netscape.com writes:
 

how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
get the Amps needed. About 5 Amps each. Geo
----- Original Message -----
From: "robert8rpi" <robert8rpi@yahoo.co.uk>
To: <GeigerCounterEnthusiasts@yahoogroups.com>
Sent: Friday, November 13, 2009 2:56 PM
Subject: [GeigerCounterEnthusiasts] Re: Zerners

> Hi,
> A voltage converter won't work well as you need one for each line to the
> trailer, Side lights, brake lights, numberplate light etc.
> Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> zenner power = total lamp wattage on that line. Here in the UK brake
> lights are 21W each so you would need a 45W or 50W zenner for just that
> line. This would not be practical unless you can find some surplus high
> power diodes. Easiest solution is to change the bulbs to 24V ones!
> If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> in each line with all the gates being driven by a 50% duty cycle
> squarewave. This will give half the power out and will work fine with
> filament lamps. No need for big heatsinks either. You could buld this into
> an adaptor lead.
>
> Robert G8RPI.
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>>
>> Hi all I know that this is not the correct group to ask this question
>> really but after belonging to it for a long time with the great minds
>> that are
>> here I figure some of you will have a simple answer. So here it is I have
>> a
>> military truck with a 24 volt dc system, what do I need to make up to my
>> trailer pigtail to hook up to my 12 volt dc trailer like a zerner in
>> line ?
>> if so what size ? any ideas please let me know. Thankyou, Mark
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>


Reply | Forward | Messages in this Topic (19)
#17504 From: "arthurok" <arthurok@...>
Date: Sat Nov 14, 2009 6:12 am
Subject: Re: Re: Zerners 		arthurok_2000
Online Now Online Now
Send Email Send Email
 
because they  are  lamp filaments     a 50%   duty  cycle  wont provide exactly half brightness.    i  think  more  like a 30%  dutycycle  is  correct   
----- Original Message -----
From: robert8rpi
Sent: Friday, November 13, 2009 2:56 PM
Subject: [GeigerCounterEnthusiasts] Re: Zerners

 

Hi,
A voltage converter won't work well as you need one for each line to the trailer, Side lights, brake lights, numberplate light etc.
Zeners will work but you need big ones. Simple math zenner voltage = 14V, zenner power = total lamp wattage on that line. Here in the UK brake lights are 21W each so you would need a 45W or 50W zenner for just that line. This would not be practical unless you can find some surplus high power diodes. Easiest solution is to change the bulbs to 24V ones!
If you have electronic abilities you could put a cheap MOSFET (e.g IRF510) in each line with all the gates being driven by a 50% duty cycle squarewave. This will give half the power out and will work fine with filament lamps. No need for big heatsinks either. You could buld this into an adaptor lead.

Robert G8RPI.

--- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>
> Hi all I know that this is not the correct group to ask this question
> really but after belonging to it for a long time with the great minds that are
> here I figure some of you will have a simple answer. So here it is I have a
> military truck with a 24 volt dc system, what do I need to make up to my
> trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ?
> if so what size ? any ideas please let me know. Thankyou, Mark
>


Reply | Forward | Messages in this Topic (19)
#17503 From: "arthurok" <arthurok@...>
Date: Sat Nov 14, 2009 5:47 am
Subject: Re: Re: Zerners 		arthurok_2000
Online Now Online Now
Send Email Send Email
 

how  about  using  mosfets  in  parallel?
----- Original Message -----
From: wharpt@...
Sent: Friday, November 13, 2009 7:00 PM
Subject: Re: [GeigerCounterEnthusiasts] Re: Zerners

 

Uhh, guys (and gals that may be out there) why not just wire a duplicate set of bulbs in series with the existing bulbs? Doesn't have to be mounted on the trailer, just in a box with the 24v leads coming in one side thru the bulbs and out to the 12 v trailer. Two 12V bulbs in series should equal 24V, right?
 
Wharpt
 
In a message dated 11/13/2009 3:57:48 P.M. Central Standard Time, GEOelectronics@netscape.com writes:
 

how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
get the Amps needed. About 5 Amps each. Geo
----- Original Message -----
From: "robert8rpi" <robert8rpi@yahoo.co.uk>
To: <GeigerCounterEnthusiasts@yahoogroups.com>
Sent: Friday, November 13, 2009 2:56 PM
Subject: [GeigerCounterEnthusiasts] Re: Zerners

> Hi,
> A voltage converter won't work well as you need one for each line to the
> trailer, Side lights, brake lights, numberplate light etc.
> Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> zenner power = total lamp wattage on that line. Here in the UK brake
> lights are 21W each so you would need a 45W or 50W zenner for just that
> line. This would not be practical unless you can find some surplus high
> power diodes. Easiest solution is to change the bulbs to 24V ones!
> If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> in each line with all the gates being driven by a 50% duty cycle
> squarewave. This will give half the power out and will work fine with
> filament lamps. No need for big heatsinks either. You could buld this into
> an adaptor lead.
>
> Robert G8RPI.
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>>
>> Hi all I know that this is not the correct group to ask this question
>> really but after belonging to it for a long time with the great minds
>> that are
>> here I figure some of you will have a simple answer. So here it is I have
>> a
>> military truck with a 24 volt dc system, what do I need to make up to my
>> trailer pigtail to hook up to my 12 volt dc trailer like a zerner in
>> line ?
>> if so what size ? any ideas please let me know. Thankyou, Mark
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>


Reply | Forward | Messages in this Topic (19)
#17502 From: "Bill" <wwattson@...>
Date: Sat Nov 14, 2009 2:46 am
Subject: Re: Zerners 		wwattso
Offline Offline
Send Email Send Email
  
It would be easier to use a dropping resistor. The wattage rating of the
resistor has to equal the total of the bulbs in the circuit. The resistance is
roughly equal to the resistance of the filaments in the circuit or 144/total
watts (E^2/W). Just a thought.

Bill




--- In GeigerCounterEnthusiasts@yahoogroups.com, wharpt@... wrote:
>
> Uhh, guys (and gals that may be out there) why not just wire a duplicate
> set of bulbs in series with the existing bulbs? Doesn't have to be mounted on
>  the trailer, just in a box with the 24v leads coming in one side thru the
> bulbs  and out to the 12 v trailer. Two 12V bulbs in series should equal
> 24V,  right?
>
> Wharpt
>
>
> In a message dated 11/13/2009 3:57:48 P.M. Central Standard Time,
> GEOelectronics@... writes:
>
>
>
>
> how about a couple of 2N3055's driven by a 12V zener. As many as it takes
> to
> get the Amps needed. About 5 Amps each. Geo
> ----- Original Message  -----
> From: "robert8rpi" <_robert8rpi@..._
> (mailto:robert8rpi@...) >
> To:  <_GeigerCounterEnthusGeigerCounterEntGeige_
> (mailto:GeigerCounterEnthusiasts@yahoogroups.com) >
> Sent:  Friday, November 13, 2009 2:56 PM
> Subject: [GeigerCounterEnthuSubject: [GeigerCounter
>
> > Hi,
> > A voltage converter won't work well as you  need one for each line to the
> > trailer, Side lights, brake lights,  numberplate light etc.
> > Zeners will work but you need big ones. Simple  math zenner voltage =
> 14V,
> > zenner power = total lamp wattage on that  line. Here in the UK brake
> > lights are 21W each so you would need a  45W or 50W zenner for just that
> > line. This would not be practical  unless you can find some surplus high
> > power diodes. Easiest solution  is to change the bulbs to 24V ones!
> > If you have electronic abilities  you could put a cheap MOSFET (e.g
> IRF510)
> > in each line with all the  gates being driven by a 50% duty cycle
> > squarewave. This will give  half the power out and will work fine with
> > filament lamps. No need  for big heatsinks either. You could buld this
> into
> > an adaptor  lead.
> >
> > Robert G8RPI.
> >
> > --- In _GeigerCounterEnthusGeigerCounterEntGeige_
> (mailto:GeigerCounterEnthusiasts@yahoogroups.com) ,  docico325@,  do
> >>
> >> Hi all I know that this is  not the correct group to ask this question
> >> really but after  belonging to it for a long time with the great minds
> >> that  are
> >> here I figure some of you will have a simple answer. So here  it is I
> have
> >> a
> >> military truck with a 24 volt dc  system, what do I need to make up to my
> >> trailer pigtail to hook up  to my 12 volt dc trailer like a zerner in
> >> line ?
> >> if  so what size ? any ideas please let me know. Thankyou,  Mark
> >>
> >
> >
> >
> >
> >  ------------  ----  ----  -
> >
> > Yahoo!  Groups Links
> >
> >
> >
>

Reply | Forward | Messages in this Topic (19)
#17500 From: wharpt@...
Date: Fri Nov 13, 2009 8:00 pm
Subject: Re: Re: Zerners 		wharpt1
Offline Offline
Send Email Send Email
 
Uhh, guys (and gals that may be out there) why not just wire a duplicate set of bulbs in series with the existing bulbs? Doesn't have to be mounted on the trailer, just in a box with the 24v leads coming in one side thru the bulbs and out to the 12 v trailer. Two 12V bulbs in series should equal 24V, right?
 
Wharpt
 
In a message dated 11/13/2009 3:57:48 P.M. Central Standard Time, GEOelectronics@... writes:
 

how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
get the Amps needed. About 5 Amps each. Geo
----- Original Message -----
From: "robert8rpi" <robert8rpi@yahoo.co.uk>
To: <GeigerCounterEnthusiasts@yahoogroups.com>
Sent: Friday, November 13, 2009 2:56 PM
Subject: [GeigerCounterEnthusiasts] Re: Zerners

> Hi,
> A voltage converter won't work well as you need one for each line to the
> trailer, Side lights, brake lights, numberplate light etc.
> Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> zenner power = total lamp wattage on that line. Here in the UK brake
> lights are 21W each so you would need a 45W or 50W zenner for just that
> line. This would not be practical unless you can find some surplus high
> power diodes. Easiest solution is to change the bulbs to 24V ones!
> If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> in each line with all the gates being driven by a 50% duty cycle
> squarewave. This will give half the power out and will work fine with
> filament lamps. No need for big heatsinks either. You could buld this into
> an adaptor lead.
>
> Robert G8RPI.
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>>
>> Hi all I know that this is not the correct group to ask this question
>> really but after belonging to it for a long time with the great minds
>> that are
>> here I figure some of you will have a simple answer. So here it is I have
>> a
>> military truck with a 24 volt dc system, what do I need to make up to my
>> trailer pigtail to hook up to my 12 volt dc trailer like a zerner in
>> line ?
>> if so what size ? any ideas please let me know. Thankyou, Mark
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Reply | Forward | Messages in this Topic (19)
#17499 From: "Geo>K0FF" <GEOelectronics@...>
Date: Fri Nov 13, 2009 9:47 pm
Subject: Re: Re: Zerners 		K0FF
Offline Offline
Send Email Send Email
  
how about a couple of 2N3055's driven by a 12V zener. As many as it takes to
get the Amps needed. About 5 Amps each.  Geo
----- Original Message -----
From: "robert8rpi" <robert8rpi@...>
To: <GeigerCounterEnthusiasts@yahoogroups.com>
Sent: Friday, November 13, 2009 2:56 PM
Subject: [GeigerCounterEnthusiasts] Re: Zerners


> Hi,
> A voltage converter won't work well as you need one for each line to the
> trailer, Side lights, brake lights, numberplate light etc.
> Zeners will work but you need big ones. Simple math zenner voltage = 14V,
> zenner power = total lamp wattage on that line. Here in the UK brake
> lights are 21W each so you would need a 45W or 50W zenner for just that
> line. This would not be practical unless you can find some surplus high
> power diodes. Easiest solution is to change the bulbs to 24V ones!
> If you have electronic abilities you could put a cheap MOSFET (e.g IRF510)
> in each line with all the gates being driven by a 50% duty cycle
> squarewave. This will give half the power out and will work fine with
> filament lamps. No need for big heatsinks either. You could buld this into
> an adaptor lead.
>
> Robert G8RPI.
>
> --- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>>
>> Hi all I know that this is not the correct group to ask this question
>> really but after belonging to it for a long time with the great minds
>> that are
>> here I figure some of you will have a simple answer. So here it is I have
>> a
>> military truck with a 24 volt dc system, what do I need to make up to my
>> trailer  pigtail to hook up to my 12 volt dc trailer like a zerner in
>> line ?
>> if so what  size ? any ideas please let me know. Thankyou,   Mark
>>
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

Reply | Forward | Messages in this Topic (19)
#17498 From: "robert8rpi" <robert8rpi@...>
Date: Fri Nov 13, 2009 8:56 pm
Subject: Re: Zerners 		robert8rpi
Offline Offline
Send Email Send Email
  
Hi,
A voltage converter won't work well as you need one for each line to the
trailer, Side lights, brake lights, numberplate light etc.
Zeners will work but you need big ones. Simple math zenner voltage = 14V, zenner
power = total lamp wattage on that line. Here in the UK brake lights are 21W
each so you would need a 45W or 50W zenner for just that line. This would not be
practical unless you can find some surplus high power diodes. Easiest solution
is to change the bulbs to 24V ones!
If you have electronic abilities you could put a cheap MOSFET (e.g IRF510) in
each line with all the gates being driven by a 50% duty cycle squarewave. This
will give half the power out and will work fine with filament lamps. No need for
big heatsinks either. You could buld this into an adaptor lead.

Robert G8RPI.

--- In GeigerCounterEnthusiasts@yahoogroups.com, docico325@... wrote:
>
> Hi all I know that this is not the correct group to ask this question
> really but after belonging to it for a long time with the great minds that are
> here I figure some of you will have a simple answer. So here it is I have a
> military truck with a 24 volt dc system, what do I need to make up to my
> trailer  pigtail to hook up to my 12 volt dc trailer like a zerner in line ?
> if so what  size ? any ideas please let me know. Thankyou,   Mark
>

Reply | Forward | Messages in this Topic (19)
#17497 From: "Geo>K0FF" <GEOelectronics@...>
Date: Fri Nov 13, 2009 4:20 pm
Subject: Re: Zerners 		K0FF
Offline Offline
Send Email Send Email
 

Mark, not as problem. This is an international list, carried on in English. It is well known that many of us are not English speakers! All are welcome at any level of English proficiency......
 
Geo
 
----- Original Message -----
Sent: Friday, November 13, 2009 10:16 AM
Subject: Re: [GeigerCounterEnthusiasts] Zerners

No I am the embarrassed one I meant zeners sorry. Mark
 
In a message dated 11/13/2009 10:31:35 A.M. Eastern Standard Time, bobmerk@... writes:
 



I'm really embarrassed to ask, and I don't want to embarrass anybody else, but ....... do you guys mean ZENERs?
 
If not ... what's a Zerner?
 
 
 
 
----- Original Message -----
Sent: Friday, November 13, 2009 10:11 AM
Subject: Re: [GeigerCounterEnthusiasts] Zerners

 

I am not sure how many amps, the lighting on a trailer, stop,turn, running lights. How would I wire a stepdown converter into the signaling circuit that's 24v on the truck and 12 volt to the trailer lights. See I want to leave the 24volt plug there and put a 12 volt plug next to it so depending on which trailer I wanted you can just plug in.
 
In a message dated 11/13/2009 9:18:14 A.M. Eastern Standard Time, torre.wtc@libero.it writes:
 

step down converter. How many amps???
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark


Reply | Forward | Messages in this Topic (19)
#17496 From: docico325@...
Date: Fri Nov 13, 2009 11:16 am
Subject: Re: Zerners 		docusn1
Offline Offline
Send Email Send Email
 
No I am the embarrassed one I meant zeners sorry. Mark
 
In a message dated 11/13/2009 10:31:35 A.M. Eastern Standard Time, bobmerk@... writes:
 



I'm really embarrassed to ask, and I don't want to embarrass anybody else, but ....... do you guys mean ZENERs?
 
If not ... what's a Zerner?
 
 
 
 
----- Original Message -----
Sent: Friday, November 13, 2009 10:11 AM
Subject: Re: [GeigerCounterEnthusiasts] Zerners

 

I am not sure how many amps, the lighting on a trailer, stop,turn, running lights. How would I wire a stepdown converter into the signaling circuit that's 24v on the truck and 12 volt to the trailer lights. See I want to leave the 24volt plug there and put a 12 volt plug next to it so depending on which trailer I wanted you can just plug in.
 
In a message dated 11/13/2009 9:18:14 A.M. Eastern Standard Time, torre.wtc@libero.it writes:
 

step down converter. How many amps???
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark


Reply | Forward | Messages in this Topic (19)
#17495 From: "Robert Merkin" <bobmerk@...>
Date: Fri Nov 13, 2009 3:30 pm
Subject: Re: Zerners 		jameskpolka
Offline Offline
Send Email Send Email
 

I'm really embarrassed to ask, and I don't want to embarrass anybody else, but ....... do you guys mean ZENERs?
 
If not ... what's a Zerner?
 
 
 
 
----- Original Message -----
Sent: Friday, November 13, 2009 10:11 AM
Subject: Re: [GeigerCounterEnthusiasts] Zerners

 

I am not sure how many amps, the lighting on a trailer, stop,turn, running lights. How would I wire a stepdown converter into the signaling circuit that's 24v on the truck and 12 volt to the trailer lights. See I want to leave the 24volt plug there and put a 12 volt plug next to it so depending on which trailer I wanted you can just plug in.
 
In a message dated 11/13/2009 9:18:14 A.M. Eastern Standard Time, torre.wtc@libero.it writes:
 

step down converter. How many amps???
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark


Reply | Forward | Messages in this Topic (19)
#17494 From: docico325@...
Date: Fri Nov 13, 2009 10:11 am
Subject: Re: Zerners 		docusn1
Offline Offline
Send Email Send Email
 
I am not sure how many amps, the lighting on a trailer, stop,turn, running lights. How would I wire a stepdown converter into the signaling circuit that's 24v on the truck and 12 volt to the trailer lights. See I want to leave the 24volt plug there and put a 12 volt plug next to it so depending on which trailer I wanted you can just plug in.
 
In a message dated 11/13/2009 9:18:14 A.M. Eastern Standard Time, torre.wtc@... writes:
 

step down converter. How many amps???
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark

Reply | Forward | Messages in this Topic (19)
#17493 From: "Sicurezza Torre WTC" <torre.wtc@...>
Date: Fri Nov 13, 2009 2:35 pm
Subject: Re: Zerners 		happynewlaser
Offline Offline
Send Email Send Email
 
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark


Reply | Forward | Messages in this Topic (19)
#17492 From: "Sicurezza Torre WTC" <torre.wtc@...>
Date: Fri Nov 13, 2009 2:17 pm
Subject: Re: Zerners 		happynewlaser
Offline Offline
Send Email Send Email
 
step down converter. How many amps???
----- Original Message -----
Sent: Friday, November 13, 2009 1:55 PM
Subject: [GeigerCounterEnthusiasts] Zerners

 

Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark


Reply | Forward | Messages in this Topic (19)
#17491 From: docico325@...
Date: Fri Nov 13, 2009 7:55 am
Subject: Zerners 		docusn1
Offline Offline
Send Email Send Email
 
Hi all I know that this is not the correct group to ask this question really but after belonging to it for a long time with the great minds that are here I figure some of you will have a simple answer. So here it is I have a military truck with a 24 volt dc system, what do I need to make up to my trailer pigtail to hook up to my 12 volt dc trailer like a zerner in line ? if so what size ? any ideas please let me know. Thankyou,  Mark

Reply | Forward | Messages in this Topic (19)
#17490 From: "K0FF" <GEOelectronics@...>
Date: Thu Nov 12, 2009 3:15 pm
Subject: Liquidation Dhyce Collection 		K0FF
Offline Offline
Send Email Send Email
  
George - i am having troubles logging into Yahoo - so please pass this on
to the group.

Liquidation Dhyce Collection - many pieces UR & RAD -
  garage is full and has to make room for the new rock saw and tumblers,
polisher and rough.
since I will be spending much more time in the garage - my shins whould
be cooked - so some of the collection needs to move out.
esp. some hot ones that you collectors might enjoy !

please check out - Ebay seller    Jkoskta

thank you

Jim Kostka  202 207 5437
Leesburg VA

Reply | Forward | Messages in this Topic (2)
#17489 From: "bcer_eh" <chanhopkins@...>
Date: Thu Nov 12, 2009 4:29 am
Subject: Electron scanning microscope 		bcer_eh
Offline Offline
Send Email Send Email
  
If you're in the market check out the British Columbia government's auction
website (called Asset Investment Recovery)
http://www.bcauction.ca/open.dll/showDisplayDocument?sessionID=18058872&disID=58\
54455&docType=Tender&dis_version_nos=0&doc_search_by=Tend&docTypeQual=TN

Current bid = CAN$6.00

Reply | Forward | Messages in this Topic (1)
#17486 From: "Robert Merkin" <bobmerk@...>
Date: Wed Nov 11, 2009 5:51 pm
Subject: Re: The 11th hour 		jameskpolka
Offline Offline
Send Email Send Email
 
Thanks GEO. In peacetime I can negotiate this day reasonably well.
 
It's not peacetime. I am praying that will change very soon.
 
 
Bob
 
 
 
 
----- Original Message -----
From: Geo>K0FF
Sent: Wednesday, November 11, 2009 12:25 PM
Subject: [GeigerCounterEnthusiasts] The 11th hour

 

The 11th hour or the 11th day of the 11th month.
 
Happy Veteran's day.
 
 


Reply | Forward | Messages in this Topic (2)
#17485 From: "Geo>K0FF" <GEOelectronics@...>
Date: Wed Nov 11, 2009 5:25 pm
Subject: The 11th hour 		K0FF
Offline Offline
Send Email Send Email
 
The 11th hour or the 11th day of the 11th month.
 
Happy Veteran's day.
 
 

Reply | Forward | Messages in this Topic (2)
#17484 From: "Geo>K0FF" <GEOelectronics@...>
Date: Wed Nov 11, 2009 2:05 am
Subject: MCA for sale 		K0FF
Offline Offline
Send Email Send Email
 
 
Nuclear Data Model SIX. Everything I know how to check works fine. So far I have not figured out how to turn on the HV, but feeding a pulse to the SIG IN jack registers a count on the CRT screen which is bright and clear.
 
Made in 1986, it has seen little use. Insides look new, it works from 15 small flashlight batteries or external BATT jack.
 
No manual
 
$350 + shipping ( or trade for??)
 
 
Geo

Reply | Forward | Messages in this Topic (2)
#17483 From: "pe1rln" <thijs.has@...>
Date: Tue Nov 10, 2009 9:53 am
Subject: Re: sv500 mod 		pe1rln
Offline Offline
Send Email Send Email
  
Did you already use one tube on the SV500? Should be possible, not?

I'm eagre to know because today I got two tubes SBM-20 and I already have the
SV500 so...

Best regards,

Thijs

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