What I have is a 7493 configured to reset when the count
reaches 12 or when outputs D and C go high.  At other times, I want
the 7493 to reset when the count reaches 10 or when outputs D and B go
high.  For that, I can directly connect D to one reset and the other
reset could go to a double-pole, single-throw switch with the other
two terminals of the switch going to B and C.  I wanted the switch,
however, to be made of digital logic so I only need ground a line to
change from B--Reset to C--reset.
--
Author: Martin McCormick
   INET: martin@...

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Hi Martin,

Fairly spoken: your expanation is not very clear to me. Is it, you
want to connect one of the resets of the 7493 via a CMOS switch to
one of the outputs of the 7493? In that case my imediate reaction is:
why not via an and-gate? It are digital signals, so digital circuit
suit well.
And it seems to me that you are creating a hazard in this way for the
resets are level inputs. At the moment the output goes high (or low,
whatever is applicable) the reset will activate, but when to flip-
flop belonging to the output signal is resetting faster than the
other flip-flops, it is not sure the other flip-flops will also
reset.

As for the CMOS switches, I agree with Declans remark obout other
types. Be aware that the 4016 was an earley design of CMOS switch and
later types are better in general. Depending from what you want see
p.e. 4066 and 4316. The latter has an analog level around 0V, The
4016 and 4066 around halve the supply voltage. Between manufacturers
there are differences in Rdson for the same type of circuit.

>  I need to connect one of the reset lines on a 7493 to one or
> another of two outputs on that counter.  Are there any TTL or
> TTL compatible chips that resemble the CD4016 in that each switch on
> the chip has an input, output and tristate line to turn the switch
> completely off?
>
>  I thought of using a CD4016 for this purpose but I like to
> save those for analog switching and I am not sure it would even work
> properly at 2.4 MHZ which is the clock frequency in the circuit.
>
>  In this particular case, I need non-inverting outputs.  If
> there is such a device, is there also an inverting version of the same
> thing?
>
> Martin McCormick
> --
> Author: Martin McCormick
>   INET: martin@...
>
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> also send the HELP command for other information (like subscribing).
>


--
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A good place to start is, to rip some old hard drives or floppy drives apart,
there you find as part of the servo control at least 3 hall bridges.

Good luck

Friedel



At 01:04 p.m. 10/07/03 -0800, you wrote:
>I'm trying to locate a hall sensor labelled 3HR
>4 pins SMD.
>The device is of japanese design if that helps.
>Picture: sukandar.de/files/hallsensor.jpg
>
>any ideas ?
>
>thanks,
>Sukandar
>
>--
>Author: Sukandar Kartadinata
>  INET: sk@...
>
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>also send the HELP command for other information (like subscribing).

--
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Hi Namaste! (greetings with folded hands)

Siemens seems tobe having Hall Effect semiconductor sensor for the
Applications;
1. Magnetic AC/DC filelds_ EA218/FA22e/FA24/FC32/FC34/SBV525 listed on page;
3.3/section B3  of preferred products '86 catalog   but expensive ea. 270 DM
and >
2. For Magnetic axial fields; probe type  RHY 11    ; costs DM 272
3. position sensor SBV 566  looks like what u describe on page. 3.4  costs
DM 8
4. Hall Generators as multiplicators; SV200C3/SV210/SV230 S costs 50 to 180
DM
5. position sensors KSY10/KSY13 matches ur pack requirements and costs; 8-10
DM , i have a feeling this is what u need..
6. Differential Hall sensor  KSY 20  pages 3.12 -3.13
chk the Siemens url for these type nos and hopefully u should get what you
need
hope this helps  cheers...Hemang
----- Original Message -----
To: Multiple recipients of list CHIPDIR-L <CHIPDIR-L@...>
Sent: Friday, July 11, 2003 11:54 PM


> thanks for the suggestions, Tony.
>
> the sensor is not bad - I have to bring it to a different location w/o
> destroying the original board. It's from a Yamaha musical instrument
> where it's used to measure distance. So it's not just a Hall switch
> where I could replace it with any other Hall Sensor, but something with
> a distinct response curve I suppose, so it'd be cool to have the exact
> same chip.
>
> On Friday, July 11, 2003, at 12:24 AM, TQuiroz@... wrote:
>
> > Not a clue.
> > From the picture, it looks like part of a motor drive from a VCR. Is
> > the sensor bad?
> > If you are looking for a replacement, you are better off ripping a
> > sensor from an old VCR. Maybe floppy drives.
> > For reference, Allegro and Honeywell do have surface mount sensors,
> > but not in the package shown in the picture.
> > You might want to check the usual Japanese suspects: Toshiba, Sony,
> > NEC, Sanyo, Mitsubishi, etc. Don't bother with their European or
> > American sites, go directly to their Japanese sites.
> >
> > Hope this helps.
> > Tony
> >
>
> --
> Author: Sukandar Kartadinata
>   INET: sk@...
>
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--
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Hi list,

I'm looking for basic information of the MC6843 floppy controller chip. An
extensive google search only gave the one answer that I already had: It's a
floppy controller chip by Motorola. I also found out that Hitachi made it's
own version of it, the 46503.

I'd like to know if the chip is another derivate of the all-time popular
NEC765, of which the core is used until today, or if it can do special
things with the disk. In other words: What type of encoding did it use
(mfm, fm, gcr), sector sizes, bitrates, checksumming and stuff.

Pinout and programming of the chip are NOT of interest. I'm more interested
in the way it records data, so I can write a tool that recovers the data
with today's equipment.

Thanks for any help,
--
Jens Schönfeld

--
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thanks for the suggestions, Tony.

the sensor is not bad - I have to bring it to a different location w/o
destroying the original board. It's from a Yamaha musical instrument
where it's used to measure distance. So it's not just a Hall switch
where I could replace it with any other Hall Sensor, but something with
a distinct response curve I suppose, so it'd be cool to have the exact
same chip.

On Friday, July 11, 2003, at 12:24 AM, TQuiroz@... wrote:

> Not a clue.
> From the picture, it looks like part of a motor drive from a VCR. Is
> the sensor bad?
> If you are looking for a replacement, you are better off ripping a
> sensor from an old VCR. Maybe floppy drives.
> For reference, Allegro and Honeywell do have surface mount sensors,
> but not in the package shown in the picture.
> You might want to check the usual Japanese suspects: Toshiba, Sony,
> NEC, Sanyo, Mitsubishi, etc. Don't bother with their European or
> American sites, go directly to their Japanese sites.
>
> Hope this helps.
> Tony
>

--
Author: Sukandar Kartadinata
   INET: sk@...

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On Fri, Jul 11, 2003 at 06:05:46AM -0800, Martin McCormick enlightened us thusly
>  I need to connect one of the reset lines on a 7493 to one or
> another of two outputs on that counter.  Are there any TTL or
> TTL compatible chips that resemble the CD4016 in that each switch on
> the chip has an input, output and tristate line to turn the switch
> completely off?
>
>  I thought of using a CD4016 for this purpose but I like to
> save those for analog switching and I am not sure it would even work
> properly at 2.4 MHZ which is the clock frequency in the circuit.
>
>  In this particular case, I need non-inverting outputs.  If
> there is such a device, is there also an inverting version of the same
> thing?

Don't ignore the 4051-3 cmos switches, and the 4066. Many of these may
be available as 74hc4xxx

On a simpler note, there is also things like the 4019(?) which offers
and/or function; there is also a tristateable version (40157? he offers,
trying to think back to 1981).

These may provide the function you require. I dont think 4xxx cmos is
scared off at 2.4 Mhz. I think you can get 5Mhz easily enough, and 10Mhz
has been seen, although you are departing from reality up there
because of the 100ns propagation time. The current is also up.
--

	 With best Regards,


	 Declan Moriarty.
--
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I need to connect one of the reset lines on a 7493 to one or
another of two outputs on that counter.  Are there any TTL or
TTL compatible chips that resemble the CD4016 in that each switch on
the chip has an input, output and tristate line to turn the switch
completely off?

	 I thought of using a CD4016 for this purpose but I like to
save those for analog switching and I am not sure it would even work
properly at 2.4 MHZ which is the clock frequency in the circuit.

	 In this particular case, I need non-inverting outputs.  If
there is such a device, is there also an inverting version of the same
thing?

Martin McCormick
--
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I'm trying to locate a hall sensor labelled 3HR
4 pins SMD.
The device is of japanese design if that helps.
Picture: sukandar.de/files/hallsensor.jpg

any ideas ?

thanks,
Sukandar

--
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----- Original Message -----

From: gptronics

To: Multiple recipients of list CHIPDIR-L

Sent: Thursday, July 10, 2003 2:14 AM

Subject: mainboard connectors

Hello everybody,

   

I am designing  pcb that has to bear all the connectors that a mainboard bears (stucked PS/2 or two singles,  T-type LPT connector that "contains" the two Com connectors,  GAME Port connector that "contains" the three audio connectors  and ofcourse the atx-power Molex mini-fit jr. connector).

Does any body knows where can i buy these connectors ? Any information (e-mail, fax, telephone, address of the provider) would be appreciated.

 

Thanks in advance

 

George from Greece

At 2003-07-09 13:19 -0800, Jens Schönfeld wrote:
>At 12:44 09.07.2003 -0800, you wrote:
>>
>>I am designing  pcb that has to bear all the connectors that a mainboard bears
(stucked PS/2 or two singles,  T-type LPT connector that "contains" the two Com
connectors,  GAME Port connector that "contains" the three audio connectors  and
ofcourse the atx-power Molex mini-fit jr. connector).
>>Does any body knows where can i buy these connectors ? Any information
(e-mail, fax, telephone, address of the provider) would be appreciated.
>
>You'll have to import them, that's what I had to do for the C-One board. See
>
>www.c64upgra.de/c-one
>
>for details and pictures. It took me months to find out that there's no
reasonable supplier in Europe, so you better start digging for contacts in
Taiwan or China.

Yes, try something like:

http://www.asiansources.com/

But you can probably only get those things
affordably in serious amounts from Asia.

You could also contact your local AMP man.

'Our AMP man' of years back claimed that AMP
either made any connector and better than
the others or that they had a good reason not
to produce it because it wasn't based on sound
technological principles.


Greetings,
Jaap

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Hi Martin,

>  I have the pin-out chart for a 7473 JK flipflop and know that
> at least one configuration is such that for every pulse on the Clock
> the Q and ^Q outputs reverse state.  What do you do with the J and K
> inputs in relation to the outputs to get this configuration?

The only difference between a RS flip-flop and a JK flip-flop is that
R=1=S is forbidden, but J=1=K just let toggle the flip-flop every
clockpuls. The necessary connections with the outputs are made
internaly by the designer.

If you want not to count clockpulses, but events and you have a clock
signal, connect both J and K to the event signal. If you don't have a
clock, connect J and K to 1 (logic High) and connect the event signal
to the clock input.

All these with the assumption that logic 1 = High voltage level.

Succes, Harry

>
>  I had carefully written down the pin-out chart and failed to
> write down the configuration that causes it to act as a one-stage
> counter.
>
>  I am building a chopper modulator and the complimentary
> outputs are just what I need to drive the CD4016 control lines.
>
>  Many thanks and I'll make sure it gets written down this time.
>
> Martin McCormick WB5AGZ  Stillwater, OK
> OSU Information Technology Division Network Operations Group
> --
> Author: Martin McCormick

--
Author: H.C. Croon
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I have the pin-out chart for a 7473 JK flipflop and know that
at least one configuration is such that for every pulse on the Clock
the Q and ^Q outputs reverse state.  What do you do with the J and K
inputs in relation to the outputs to get this configuration?

	 I had carefully written down the pin-out chart and failed to
write down the configuration that causes it to act as a one-stage
counter.

	 I am building a chopper modulator and the complimentary
outputs are just what I need to drive the CD4016 control lines.

	 Many thanks and I'll make sure it gets written down this time.

Martin McCormick WB5AGZ  Stillwater, OK
OSU Information Technology Division Network Operations Group
--
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At 12:44 09.07.2003 -0800, you wrote:
>
>I am designing  pcb that has to bear all the connectors that a mainboard
>bears (stucked PS/2 or two singles,  T-type LPT connector that "contains"
>the two Com connectors,  GAME Port connector that "contains" the three
>audio connectors  and ofcourse the atx-power Molex mini-fit jr. connector).
>Does any body knows where can i buy these connectors ? Any information
>(e-mail, fax, telephone, address of the provider) would be appreciated.

You'll have to import them, that's what I had to do for the C-One board. See

www.c64upgra.de/c-one

for details and pictures. It took me months to find out that there's no
reasonable supplier in Europe, so you better start digging for contacts in
Taiwan or China.

ciao,
--
Jens Schönfeld

--
Author: Jens =?iso-8859-1?Q?Sch=F6nfeld?=
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On Sun, Jul 06, 2003 at 06:39:19PM -0800, Bill Lee enlightened us thusly
> Hi,
> Anyone knows where can I find the color code for zener diode ? What is the
> value for "white brown brown" or "brown brown white"
> Thanks.
>
>
Was this answered?

The code is the same as the resistor code, with a decimal place or two I
imagine.
"white brown brown" or "brown brown white" would be  910 or
11000000000

At a wild guess it is/was a 9.1V zener.

--

	 With best Regards,


	 Declan Moriarty.
--
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Dear List
This was a private mail.
I mail it to the list by a mistake.
Sinc.
Ali



__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
--
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Dear Pieter
I have these prices  from other sources:
     1) MAA501  3USD
     2) A277D   4USD
     3) E355D   1.85USD
for 100+ Quantities.
Can you provide them with less price (or equivalent)?
What will be your delivery time?
By the way I'm in France.
Thanks
Sinc.
Ali


--- Pieter Hoeben <info@...> wrote:
> Hi Ali,
>
> > I need the following Ic's 1.   MAA501  2.   A277d
> 3.   E355d
> > and transistor  KF506 in quantity of >=100
> > Can anyone provide them. A. Marjovi
>
> These are old parts. Produced in country's like
> Czevoslovakia, Russia, East-Germany. I specialize
> in difficult parts, and have seen them before. I buy
> and sell difficult parts as one of my businesses.
>
> Where do you live? I also can advise replacement
> parts
> for the MAA501 and A227d. I have no replacement for
> the
> E355d. I know it is a timer in I2L technology ( very
> old),
> it must be possible to find a replacement. I think I
> can
> also get the original parts. If you live in one of
> the
> old east-european country's, you can get them over
> there.
>
> If you are interested in purchasing them from us, I
> suggest we do that by direct contact, I think this
> email
> list is not meant for commercial use?
>
> Kind regards,
>
> Pieter Hoeben
> ______________________________________________
>
>   Hoeben Electronics 	 Phone:   +31 6 51590081
>   Ronkert 44         	 Fax:     +31 13 5096025
>   5094 EW Lage Mierde  Private: +31 13 5096200
>   The Netherlands    	 E-mail:  info@...
>   http://www.hoeben.com
> ______________________________________________
>
>


__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
--
Author: ali marjovi
   INET: marjovi@...

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Date sent:       Mon, 07 Jul 2003 01:34:19 -0800
To:              Multiple recipients of list CHIPDIR-L
<CHIPDIR-L@...>
Send reply to:   CHIPDIR-L@...
Organization:    Fat City Network Services, San Diego,
California

> JW> Solution to Senditron-question:
>
> JW> Yesterday  a visit from a former tube developing engineer who worked
> JW> at Philips-Valvo for a long time brought some light into this question
> JW> Most of you were guessing right regarding the use of the tube.
>
> JW> If you llok at the picture of mine,
> JW> http://www.wuesten.net/strange/senditron2.jpg
> JW> you willsee that the bulb is pinched on both legs.
>
> JW> Somebody has guessed already that something is missing and he
> JW> was right.
>
> I knew it ;-}}
>

YES,I remember´it´s been you.

And now we know what was missing.

Have a nice day everybody

Jan



mit freundlichen Gruessen---best regards----cordialement

Jan Wuesten

Frag'Jan Zuerst -----Ask Jan First
Dipl. Ing. Jan Philipp Wuesten Elektronik
Rodauer Strasse 38
D- 64372 Ober Ramstadt, Germany
Phone: +49-6154-575556  Fax  : +49-6154-575557
<http://www.die-wuestens.de> (German and English)
mail to <FJZ@...>  or <FJZ@...>

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JW> Solution to Senditron-question:

JW> Yesterday  a visit from a former tube developing engineer who worked
JW> at Philips-Valvo for a long time brought some light into this question
JW> Most of you were guessing right regarding the use of the tube.

JW> If you llok at the picture of mine,
JW> http://www.wuesten.net/strange/senditron2.jpg
JW> you willsee that the bulb is pinched on both legs.

JW> Somebody has guessed already that something is missing and he
JW> was right.

I knew it ;-}}

    Uwe.

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Greeting:
    Where are you?
Ing. Oscar Garcia electrofe@...
----- Original Message -----
To: "Multiple recipients of list CHIPDIR-L" <CHIPDIR-L@...>
Sent: Monday, July 07, 2003 12:59 AM


> Dear Friends
> I need the following Ic's
> 1.   MAA501
> 2.   A277d
> 3.   E355d
> and transistor
>  KF506
> in quantity of >=100
> Can anyone provide them.
> (I've tried USbid.com ,Not any answer yet)
> Thanks
> A. Marjovi
>
> __________________________________
> Do you Yahoo!?
> SBC Yahoo! DSL - Now only $29.95 per month!
> http://sbc.yahoo.com
> --
> Author: ali marjovi
>   INET: marjovi@...
>
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>


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Solution to Senditron-question:

Yesterday  a visit from a former tube developing engineer who worked
at Philips-Valvo for a long time brought some light into this question

Most of you were guessing right regarding the use of the tube.

This is a small summary of what showed up:

1.) it´s NOT a voltage reference cell
2.) it´s not a mechanical inclination switch
3.) it´s a senditron tube, I got some excerpts from a Philips book on
gasfilled tubes which explains how some of them work.

the "normal" senditron is much larger, mine has a length of about 10
cm but they are larger otherwise.
They might be seen as relatives to an ignitron at that time.

My small one does not have the trigger electrode dipping in the Hg
pool as seen in the literature, it has two electrodes only.

If you llok at the picture of mine,

http://www.wuesten.net/strange/senditron2.jpg

you willsee that the bulb is pinched on both legs.

Somebody has guessed already that something is missing and he
was right.
This tube had an external spark gap installed and when fitring this,
field strenth must have been stron enough to ignite the arc in the tube.

I have no idea where this spark gap assembly went to and I have not
seen any pictures confirming this but it´s the only interpretation that
makes sense.

Thank you very much for all your contributions and ideas

Jan from Germany.



mit freundlichen Gruessen---best regards----cordialement

Jan Wuesten

Frag'Jan Zuerst -----Ask Jan First
Dipl. Ing. Jan Philipp Wuesten Elektronik
Rodauer Strasse 38
D- 64372 Ober Ramstadt, Germany
Phone: +49-6154-575556  Fax  : +49-6154-575557
<http://www.die-wuestens.de> (German and English)
mail to <FJZ@...>  or <FJZ@...>

--
Author: Jan Wuesten
   INET: fjz@...

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Dear Friends
I need the following Ic's
1.   MAA501
2.   A277d
3.   E355d
and transistor
  KF506
in quantity of >=100
Can anyone provide them.
(I've tried USbid.com ,Not any answer yet)
Thanks
A. Marjovi

__________________________________
Do you Yahoo!?
SBC Yahoo! DSL - Now only $29.95 per month!
http://sbc.yahoo.com
--
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Hi,
Anyone knows where can I find the color code for zener diode ? What is the
value for "white brown brown" or "brown brown white"
Thanks.


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> Hello,
>
> maybe this is  a bit off-topic but who knows :-)
>
> This is a question for all those interested in history of tubes and
> technology.
>
> I have a strange tube here of totally unknown use:
>
> It´s length is approx 10 cm, looks like a letter "H" with one electrode at
> the bottom of each leg and quite some mercury.
>
> It´s NOT a switch, there is not enough mercury in it to cover both
> electrodes at once in any possible position.
>
> so it must be something else...
>
> pics at
>
> http://www.wuesten.net/strange/senditron1.jpg
> http://www.wuesten.net/strange/senditron2.jpg
>
> What´s written on it:
>
> There is a small stamp on it saying "Senditron" ; ...wter ( disturbed,
> illegible beginning of a word ending with "wter" ) and a datecode 4 /65
> plus a single letter "D"
>
> nothing else.
>
> Anybody having an idea what this is, what it might be good for and
> who might have made it ?
>
> It´s a nice piece in my tubecollection and I always like to know what I
> collect :-)
>
> Thank you
>
> Jan

Hallo Jan,

As a consequence of my hollydays, my reaction is late:

I got the book "Industrial Electronics Handbook" by dr R. Kretzmann,
published by Philips Technical Library (which did not exists
anymore). In that book 5 pages are devoted to Senditrons. The shape
is as a H, but there are more electrodes. If you are interested, mail
it and I will try to scan these pages.

best regards, Harry
--
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Any one have a couple of NE572/SA572 or LM387's laying around collecting dust?

I need a couple of them to duplicate an old patent circuit.

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