shock mount the capsule using a cut down large rubberband,etc or a cut to fit
felt ring etc. it works,done it. plastic foam works,excpt iyt disintegrates with
time.

To: micbuilders@yahoogroups.com
From: wusiwus@...
Date: Thu, 12 Nov 2009 00:58:41 +0000
Subject: [micbuilders] Transsound TSB-2555A CAPSULES




























       I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.



I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.



Regards,



zephyrmic


















_________________________________________________________________
Bing brings you maps, menus, and reviews organized in one place.
http://www.bing.com/search?q=restaurants&form=MFESRP&publ=WLHMTAG&crea=TEXT_MFES\
RP_Local_MapsMenu_Resturants_1x1

[Non-text portions of this message have been removed]

That noise is also capsule dependent. I have two different Schoeps circuits that
behave similarly - one from Zapnspark; "DIY Generic Internal FET capsule Cond.
Microphone (P48)" and one from "Powering Microphones" site. Cable length between
capsule and Schoeps is 10cm.

http://img33.imageshack.us/i/schoepsnoise.gif/

Did you encounter on similar problem?

Jack

I just checked the mic I built with the 2555A, and nothing like that
happens.  I came up with a reasonably clever shockmount, but I think I
would have noticed something that sensitive.

-Scott

zephyrmic wrote:
> I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.
>
> I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.
>
> Regards,
>
> zephyrmic
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
And you'll visualize not taking any chances
But meet them halfway with love, peace, and persuasion
And expect them to rise to the occasion
(from "Glad Tidings", by Van Morrison)

i have built several microphones with these, including a tetrahedral, and never
had this problem.





i would suspect a faultily biased input fet. if it is close to the supply or
ground, it will bottom exactly like a diaphragm, including needing time to
recover.



umashankar

i have published my poems. read (or buy) at http://stores.lulu.com/umashankar





To: micbuilders@yahoogroups.com
From: scott@...
Date: Thu, 12 Nov 2009 07:39:58 -0600
Subject: Re: [micbuilders] Transsound TSB-2555A CAPSULES





I just checked the mic I built with the 2555A, and nothing like that
happens. I came up with a reasonably clever shockmount, but I think I
would have noticed something that sensitive.

-Scott

zephyrmic wrote:
> I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.
>
> I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.
>
> Regards,
>
> zephyrmic
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
And you'll visualize not taking any chances
But meet them halfway with love, peace, and persuasion
And expect them to rise to the occasion
(from "Glad Tidings", by Van Morrison)




_________________________________________________________________
Windows 7: Simplify what you do everyday. Find the right PC for you.
http://windows.microsoft.com/shop

[Non-text portions of this message have been removed]

This is to let you all know that I have posted 14 photos of my first attempt at
a DIY large diameter condenser mic using the TSB-2555A capsule. The photos can
be found in the Photos section under Zephyrmic LDC Mic Build.

Brief notes on the photos are in the Files section under zephyrmic's
DIY\Zephyrmic LDC Condenser Mic Notes. Enjoy! Any comments are appreciated.

Regards,

zephyrmic

i have built several microphones with these, including a tetrahedral, and never
had this problem.

i would suspect a faultily biased input fet. if it is close to the supply or
ground, it will bottom exactly like a diaphragm, including needing time to
recover.

umashankar


I checked if the FET was the problem by making a new head circuit board (see
photo) using a different FET - Sanyo 2SK596, as often used in other ECM
circuits. Changed source & drain resistors to 4K7 instead of 2K2. Works well in
this circuit.

It confirms that the noise I am getting must be mechanical capsule noise, as I
suspected. So it seems that very effective shock/vibration isolation will need
to be incorporated in the mic mount.

Regards,

zephyrmic

I have a Samson C01U USB condenser studio mic. I would like to convert this mic
to a non usb condenser mic. I was told that it's possible to rewire the internal
circuit of the above & still retain it's built-in preamp. If possible i would
prefere to use the mic directly connected to my computer without an external
preamp. Any assistance concerning the above would be most appreciated.

Sorry about the newbie post here, but my issue at hand is that I have had no
success in building my first alice mic. I am not an electronics engineer, but
consider myself to be intelligent and diligent to complete what i started,
so.....

my issue is that after following the alice schematic, did a test, and no sound
input at all, even after crankin it all the way up, then I retraced my steps to
check and reconnected a couple things, but now all i get is "radio station"
pickup....

Any tips or such for a newbie would be great.

-jinpro1

Very nicely done!  Looks like a good, sturdy construction.  Zapnspark's circuit
is great with the 2555a - I've had good results from it in a number of different
applications (vocal and strings/piano seem to work really well, and 2 mics even
did ok as drum overheads).

Darryl

--- In micbuilders@yahoogroups.com, "zephyrmic" <wusiwus@...> wrote:
>
> This is to let you all know that I have posted 14 photos of my first attempt
at a DIY large diameter condenser mic using the TSB-2555A capsule. The photos
can be found in the Photos section under Zephyrmic LDC Mic Build.
>
> Brief notes on the photos are in the Files section under zephyrmic's
DIY\Zephyrmic LDC Condenser Mic Notes. Enjoy! Any comments are appreciated.
>
> Regards,
>
> zephyrmic
>

Any chance you could post photos or scans of what you've built so far?

-Scott

jinpro1 wrote:
> Sorry about the newbie post here, but my issue at hand is that I have had no
success in building my first alice mic. I am not an electronics engineer, but
consider myself to be intelligent and diligent to complete what i started,
so.....
>
> my issue is that after following the alice schematic, did a test, and no sound
input at all, even after crankin it all the way up, then I retraced my steps to
check and reconnected a couple things, but now all i get is "radio station"
pickup....
>
> Any tips or such for a newbie would be great.
>
> -jinpro1
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
And you'll visualize not taking any chances
But meet them halfway with love, peace, and persuasion
And expect them to rise to the occasion
(from "Glad Tidings", by Van Morrison)

Scott,

Can you explain the way you mounted the 2555A capsule and made the shockmount
for it? I would be very interested to know how you did it.

Regards,

zephyrmic


--- In micbuilders@yahoogroups.com, Scott Helmke <scott@...> wrote:
>
> I just checked the mic I built with the 2555A, and nothing like that
> happens.  I came up with a reasonably clever shockmount, but I think I
> would have noticed something that sensitive.
>
> -Scott
>
> zephyrmic wrote:
> > I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.
> >
> > I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.
> >
> > Regards,
> >
> > zephyrmic

to whomever...
Where did you get the capsules TSB 2555A
Do they have that chinese 'fizz' around 10khz and make them sound so harsh?

Luc
--- On Sun, 11/15/09, zephyrmic <wusiwus@...> wrote:

From: zephyrmic <wusiwus@...>
Subject: [micbuilders] Re: Transsound TSB-2555A CAPSULES
To: micbuilders@yahoogroups.com
Received: Sunday, November 15, 2009, 9:18 PM







 













Scott,



Can you explain the way you mounted the 2555A capsule and made the shockmount
for it? I would be very interested to know how you did it.



Regards,



zephyrmic



--- In micbuilders@ yahoogroups. com, Scott Helmke <scott@...> wrote:

>

> I just checked the mic I built with the 2555A, and nothing like that

> happens.  I came up with a reasonably clever shockmount, but I think I

> would have noticed something that sensitive.

>

> -Scott

>

> zephyrmic wrote:

> > I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.

> >

> > I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.

> >

> > Regards,

> >

> > zephyrmic























       __________________________________________________________________
Yahoo! Canada Toolbar: Search from anywhere on the web, and bookmark your
favourite sites. Download it now
http://ca.toolbar.yahoo.com.

[Non-text portions of this message have been removed]

The TSB-2555A can be purchased from JLI.  You have to email or call and
ask, because they're not on the website, but they're available.

http://www.jlielectronics.com/

They do have a typical Chinese condenser high frequency boost, but if
you are building your own you can use higher-quality capacitors in the
circuit to prevent the usual nasty harshness.  A lot of affordable (or
even semi-expensive) mics use cheaper parts (especially capacitors)
which compromises the sound.

-Scott

-Scott

Luc Belanger wrote:
> to whomever...
> Where did you get the capsules TSB 2555A
> Do they have that chinese 'fizz' around 10khz and make them sound so harsh?
>
> Luc

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
And you'll visualize not taking any chances
But meet them halfway with love, peace, and persuasion
And expect them to rise to the occasion
(from "Glad Tidings", by Van Morrison)

Not sure how really effective this is, but it was the best idea I came
up with.

http://www.scotthelmke.com/Isaac-shockmount-1.jpg
http://www.scotthelmke.com/Isaac-shockmount-2.jpg
http://www.scotthelmke.com/Isaac-shockmount-3.jpg

-Scott

zephyrmic wrote:
>
> Scott,
>
> Can you explain the way you mounted the 2555A capsule and made the shockmount
for it? I would be very interested to know how you did it.
>
> Regards,
>
> zephyrmic
>
>
> --- In micbuilders@yahoogroups.com, Scott Helmke <scott@...> wrote:
>> I just checked the mic I built with the 2555A, and nothing like that
>> happens.  I came up with a reasonably clever shockmount, but I think I
>> would have noticed something that sensitive.
>>
>> -Scott
>>
>> zephyrmic wrote:
>>> I have recently built a mic - photos later - using a TSB 2555A capsule and
ZAPNSPARK Generic Back Electret Condenser Microphone circuit. Initial tests
sound good as far as I can tell. One problem encountered is that the capsule is
very sensitive to any movement, e.g. hand holding or other movement,
particularly front-to-back, rather than sideways, causes what seems to be the
diaphragm to bottom out on the back plate. Results in immediate loss of signal
till diaphragm separates from backplate, from what I can tell. Seems at present
that to be useful the whole mic will need to be well isolated from
shock/movement with an effective shockmount, and very well shielded from breath
pops.
>>>
>>> I have tried two capsules with the same results. Has anyone had the same
experience with these capsules? Does this seem to be a normal feature of this
capsule? If so, what measures can be taken to minimize the occurrence of the
problem, apart from my observations above? Looking forward to any answers from
anyone who has used these capsules.
>>>
>>> Regards,
>>>
>>> zephyrmic
>
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>
>

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
And you'll visualize not taking any chances
But meet them halfway with love, peace, and persuasion
And expect them to rise to the occasion
(from "Glad Tidings", by Van Morrison)

Thanks for that. Gives me some ideas. I will have to look at how best to modify
my mount for side address.

zephyrmic

--- In micbuilders@yahoogroups.com, Scott Helmke <scott@...> wrote:
>
> Not sure how really effective this is, but it was the best idea I came
> up with.
>
> http://www.scotthelmke.com/Isaac-shockmount-1.jpg
> http://www.scotthelmke.com/Isaac-shockmount-2.jpg
> http://www.scotthelmke.com/Isaac-shockmount-3.jpg
>
> -Scott
>
> zephyrmic wrote:
> >
> > Scott,
> >
> > Can you explain the way you mounted the 2555A capsule and made the
shockmount for it? I would be very interested to know how you did it.
> >
> > Regards,
> >
> > zephyrmic
> >
> >
> > --- In micbuilders@yahoogroups.com, Scott Helmke <scott@> wrote:
> >> I just checked the mic I built with the 2555A, and nothing like that
> >> happens.  I came up with a reasonably clever shockmount, but I think I
> >> would have noticed something that sensitive.
> >>
> >> -Scott

to build my own dynamic microphone, does anybody have a block diagram and know
what parts i should get and in which order i should assemble them? I also want
to add  a hi pass and low pass filter for making a telephonelike EQ on it.
Thanks,
Alexandra
alexajungle@...

Here are a couple of ideas for shock mounting side address capsules:

http://tinyurl.com/ylqam6m

The half rubber ball idea is not mine. I would give proper credit if I could
just remember where I saw it.

Cheers.

Jim G.
ZAPNSPARK


--- In micbuilders@yahoogroups.com, "zephyrmic" <wusiwus@...> wrote:
>
> Thanks for that. Gives me some ideas. I will have to look at how best to
modify my mount for side address.
>
> zephyrmic
>
> --- In micbuilders@yahoogroups.com, Scott Helmke <scott@> wrote:
> >
> > Not sure how really effective this is, but it was the best idea I came
> > up with.
> >
> > http://www.scotthelmke.com/Isaac-shockmount-1.jpg
> > http://www.scotthelmke.com/Isaac-shockmount-2.jpg
> > http://www.scotthelmke.com/Isaac-shockmount-3.jpg
> >
> > -Scott
> >
> > zephyrmic wrote:
> > >
> > > Scott,
> > >
> > > Can you explain the way you mounted the 2555A capsule and made the
shockmount for it? I would be very interested to know how you did it.
> > >
> > > Regards,
> > >
> > > zephyrmic
> > >
> > >
> > > --- In micbuilders@yahoogroups.com, Scott Helmke <scott@> wrote:
> > >> I just checked the mic I built with the 2555A, and nothing like that
> > >> happens.  I came up with a reasonably clever shockmount, but I think I
> > >> would have noticed something that sensitive.
> > >>
> > >> -Scott
>

use a eq to shape the spectrum for a telephone sound

To: micbuilders@yahoogroups.com
From: alexajungle@...
Date: Mon, 16 Nov 2009 17:50:54 +0000
Subject: [micbuilders] to build my own dynamic microphone




























       to build my own dynamic microphone, does anybody have a block diagram and
know what parts i should get and in which order i should assemble them? I also
want to add  a hi pass and low pass filter for making a telephonelike EQ on it.

Thanks,

Alexandra

alexajungle@...


















_________________________________________________________________
Hotmail: Trusted email with Microsoft's powerful SPAM protection.
http://clk.atdmt.com/GBL/go/177141664/direct/01/
http://clk.atdmt.com/GBL/go/177141664/direct/01/


[Non-text portions of this message have been removed]

12 or 18db per octave 300hz to 3khz bandpass should do it...

Luc

--- On Tue, 11/17/09, Robert Munger <audisar@...> wrote:

From: Robert Munger <audisar@...>
Subject: RE: [micbuilders] to build my own dynamic microphone
To: micbuilders@yahoogroups.com
Received: Tuesday, November 17, 2009, 9:52 AM


use a eq to shape the spectrum for a telephone sound

To: micbuilders@yahoogroups.com
From: alexajungle@...
Date: Mon, 16 Nov 2009 17:50:54 +0000
Subject: [micbuilders] to build my own dynamic microphone






















 


   
     
     
      to build my own dynamic microphone, does anybody have a block diagram and
know what parts i should get and in which order i should assemble them? I also
want to add  a hi pass and low pass filter for making a telephonelike EQ on it.

Thanks,

Alexandra

alexajungle@...






   
     

   
   






                            
_________________________________________________________________
Hotmail: Trusted email with Microsoft's powerful SPAM protection.
http://clk.atdmt.com/GBL/go/177141664/direct/01/
http://clk.atdmt.com/GBL/go/177141664/direct/01/


[Non-text portions of this message have been removed]



------------------------------------

Yahoo! Groups Links






       __________________________________________________________________
Looking for the perfect gift? Give the gift of Flickr!

http://www.flickr.com/gift/

[Non-text portions of this message have been removed]

Ribbon mic?

--- In micbuilders@yahoogroups.com, Robert Munger <audisar@...> wrote:
>
>
> use a eq to shape the spectrum for a telephone sound
>
> To: micbuilders@yahoogroups.com
> From: alexajungle@...
> Date: Mon, 16 Nov 2009 17:50:54 +0000
> Subject: [micbuilders] to build my own dynamic microphone
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>       to build my own dynamic microphone, does anybody have a block diagram
and know what parts i should get and in which order i should assemble them? I
also want to add  a hi pass and low pass filter for making a telephonelike EQ on
it.
>
> Thanks,
>
> Alexandra
>
> alexajungle@...
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
>
> _________________________________________________________________
> Hotmail: Trusted email with Microsoft's powerful SPAM protection.
> http://clk.atdmt.com/GBL/go/177141664/direct/01/
> http://clk.atdmt.com/GBL/go/177141664/direct/01/
>
>
> [Non-text portions of this message have been removed]
>

When I started recording max SPL in the mic database, I decided to standardize
on 0.5% THD. Meaning, all the SPL values I show are at 0.5% THD.

Some vendors use the 1% THD standard, though. Is there any linear conversion
from 1% to 0.5%?

I assume this isn't necessarily linear, but if there is a reliable conversion,
I'd appreciate knowing about it. Otherwise I'll just change the db to accept
either standard, and display that with the measurement.

Thanks.

Yes it's 6db
John L

recordinghacks
When I started recording max SPL in the mic database, I decided to
standardize on 0.5% THD. Meaning, all the SPL values I show are at 0.5% THD.

Some vendors use the 1% THD standard, though. Is there any linear conversion
from 1% to 0.5%?

I assume this isn't necessarily linear, but if there is a reliable
conversion, I'd appreciate knowing about it. Otherwise I'll just change the
db to accept either standard, and display that with the measurement.

Thanks.






--------------------------------------------------------------------------------



No virus found in this incoming message.
Checked by AVG - www.avg.com
Version: 8.5.425 / Virus Database: 270.14.69/2508 - Release Date: 11/17/09
07:40:00

--- "alexajungle" wrote:
> to build my own dynamic microphone, does anybody have a block
> diagram and know what parts i should get and in which order i
> should assemble them?

Even people who know exactly how to build a dynamic microphone
wouldn't attempt it.  Unless you mean a ribbon microphone which
is a DIY project that some people have tried.  But a traditional
coil and magnet dynamic mic seems way beyond reason.

> I also want to add a hi pass and low pass filter for making a
> telephonelike EQ on it.

The first-order effect of the "telephone sound" is to limit the
bandwidth to around 300Hz ~ 2500Hz. With either separate high-
pass and low-pass filters, or with a bandpass filter.  This is
pretty easy to do with most audio editing applications.

The second order effects of the "telephone sound" are high
distortion and background noise.

If you really want to build your own dynamic mic, you can
often buy dynamic elements from the same usual suspects that
sell condenser elements.  Then just make your enclosure like
you would if you were making a condenser mic.
If you really want the old telephone sound, why not get an
old telephone and get the old carbon button mic element out
of it?  It would require a power supply for the button, but
it ought to be easy enough to reverse engineer if you can
get your hands on an old phone.  Unscrew the mic cover from
the handset and take out the button.  Or just leave it in
the handset and wire it up there. :)

Good luck!

Bryan



> --- "alexajungle" wrote:
> > to build my own dynamic microphone, does anybody have a
> > block  diagram and know what parts i should get and in
> > which order i  should assemble them?
>
> Even people who know exactly how to build a dynamic
> microphone wouldn't attempt it.  Unless you mean a ribbon
> microphone which is a DIY project that some people have
> tried.  But a traditional coil and magnet dynamic mic
> seems way beyond reason.
>
> > I also want to add a hi pass and low pass filter for
> > making a  telephonelike EQ on it.
>
> The first-order effect of the "telephone sound" is to
> limit the bandwidth to around 300Hz ~ 2500Hz. With either
> separate high- pass and low-pass filters, or with a
> bandpass filter.  This is pretty easy to do with most
> audio editing applications.
>
> The second order effects of the "telephone sound" are high
> distortion and background noise.
>
>
>
> ------------------------------------
>
> Yahoo! Groups Links
>
>
>

No. I disagree. It's all about specsmanship.
You can argue all you want about what the number means. It is
intended to indicate the onset of overload. The difference in level
between 0.5% and 1% might be 6dB for one model, but another model
would probably be totally different because there is no guarantee
that the shape of the distortion vs level curve is the same. What if
microphone A uses an FET, and microphone B uses a tube?

My own feeling is that someone "led a heart" by changing their
measurement to 1% THD in order to have a "better" looking number. The
devil is in the details. Caveat Emptor.
--rick chinn
Uneeda Audio
=======================================
Posted by: "John Lundsten"
<mailto:john.lundsten@...?Subject=
Re%3A%20max%20SPL%20conversion>john.lundsten@...
<http://profiles.yahoo.com/lundsten_john>lundsten_john




Tue Nov 17, 2009 12:19 pm (PST)


Yes it's 6db
John L
recordinghacks
When I started recording max SPL in the mic database, I decided to
standardize on 0.5% THD. Meaning, all the SPL values I show are at 0.5% THD.
Some vendors use the 1% THD standard, though. Is there any linear conversion
from 1% to 0.5%?
I assume this isn't necessarily linear, but if there is a reliable
conversion, I'd appreciate knowing about it. Otherwise I'll just change the
db to accept either standard, and display that with the measurement.

you can use reciprocity to good effect here by simply taking the
telephone's receiver and using it as a dynamic microphone. connect
the receiver's output directly to the balanced low-impedance microphone input.

I would say that building a dynamic microphone from raw materials is
out of the question. There are too many processes involved that are
not within the capability of a home constructor.

But building one using someone else's dynamic element is completely
within the capability of a home constructor. You can also get
replacement elements and use them as a starting point.

--rick chinn

Echoing Rick's replies below, may I add that although there are very few dynamic
microphone elements made today relative to the number of electret microphones,
there are huge numbers of small dynamic elements made for use in ear buds and
small headphones.  I have no doubt but what some sort of microphone could be
made from those.  There are so many of these made today (and so poorly) that it
seems like every trash can in the city has a pair of ear buds that someone has
just thrown out...

A diy paradise.

Eric




________________________________
From: rick chinn <rickc@...>
To: micbuilders@yahoogroups.com
Sent: Thu, November 19, 2009 9:29:12 AM
Subject: [micbuilders] Re: to build my own dynamic microphone


you can use reciprocity to good effect here by simply taking the
telephone's receiver and using it as a dynamic microphone. connect
the receiver's output directly to the balanced low-impedance microphone input.

I would say that building a dynamic microphone from raw materials is
out of the question. There are too many processes involved that are
not within the capability of a home constructor.

But building one using someone else's dynamic element is completely
within the capability of a home constructor. You can also get
replacement elements and use them as a starting point.

--rick chinn




[Non-text portions of this message have been removed]

I recently acquired a Samson C01 condenser element. Unfortunately this element
did not come with any electronic components. I would like to use this element
with either a usb mic adapter or connect it through a Behringer preamp. My
purpose is to use this element for talking on the internet. Any suggestions
would be appreciated.

Hi,
     Im wondering if anyone has photos of a figure 8 capsule showing the
component parts?
Is a "true" single diaphragm figure 8 consisting of the backplate + diaphragm or
a further acoustic material to approximate the backplates influence? - Ive
modified china body cardioids into figure 8 mics by removing the acoustic delay
material at the back of the backplate, this results in a high frequency response
from the rear of the capsule which can be "fixed" (somewhat) with foam, but it
would be good to get some idea of what a real figure 8 looks like.

Kind Regards,
-Mike.

I'd like to add that LOTs of distortions come from the capsule itself, due to
the non-linear nature of capacitance to voltage transfer. The amount of
distortions very much depends on the sound pressure, capsule capacitance, stray
capacitance, and capacitance of the input device (FET, or tube).

Best, M

--- In micbuilders@yahoogroups.com, rick chinn <rickc@...> wrote:
>
>
>
> No. I disagree. It's all about specsmanship.
> You can argue all you want about what the number means. It is
> intended to indicate the onset of overload. The difference in level
> between 0.5% and 1% might be 6dB for one model, but another model
> would probably be totally different because there is no guarantee
> that the shape of the distortion vs level curve is the same. What if
> microphone A uses an FET, and microphone B uses a tube?
>
> My own feeling is that someone "led a heart" by changing their
> measurement to 1% THD in order to have a "better" looking number. The
> devil is in the details. Caveat Emptor.
> --rick chinn
> Uneeda Audio
> =======================================
> Posted by: "John Lundsten"
> <mailto:john.lundsten@...?Subject=
> Re%3A%20max%20SPL%20conversion>john.lundsten@...
> <http://profiles.yahoo.com/lundsten_john>lundsten_john
>
>
>
>
> Tue Nov 17, 2009 12:19 pm (PST)
>
>
> Yes it's 6db
> John L
> recordinghacks
> When I started recording max SPL in the mic database, I decided to
> standardize on 0.5% THD. Meaning, all the SPL values I show are at 0.5% THD.
> Some vendors use the 1% THD standard, though. Is there any linear conversion
> from 1% to 0.5%?
> I assume this isn't necessarily linear, but if there is a reliable
> conversion, I'd appreciate knowing about it. Otherwise I'll just change the
> db to accept either standard, and display that with the measurement.
>