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Putting an "internal" FET on an electret capsule

 

I have several 25mm Chinese electret capsules without internal FETs. How do I add a FET to one to make it like the TSB2590A?? And can I use any FET to do it ?? ? ?Also , In another topic I see an SMD circuit board being used. Are these available from PCBWAY or are they not commercially available??
?
Thanks.... Charles
 

Hi Charles,

You're basically looking for something like the Alice circuit and its many variants, those all do specify which FET to use.? And the FET for the Alice circuits will work for many other circuits such as SimpleP48.

As long as the capsule is an electret, ie internally polarized, you just need a FET and usually also a 1Gohm resistor.

Thanks,
-Scott

On 8/31/24 16:31, Charles Clark via groups.io wrote:
I have several 25mm Chinese electret capsules without internal FETs. How do I add a FET to one to make it like the TSB2590A?? And can I use any FET to do it ?? ? ?Also , In another topic I see an SMD circuit board being used. Are these available from PCBWAY or are they not commercially available??
Thanks.... Charles
--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry
 

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Thank you for your reply. What I am looking for is a way to solder a FET directly to the capsule like in the TSB2590 so I can use it like Jules did in the fur ball stereo Mic build that plugged directly into his camera without 48 volt phantom power. Only I want to use just one capsule and plug it into my phones 3.5 Mic jack.?


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---- On Sun, 01 Sep 2024 09:50:06 -0400 scott@... wrote ----

Hi Charles,

You're basically looking for something like the Alice circuit and its
many variants, those all do specify which FET to use.? And the FET for
the Alice circuits will work for many other circuits such as SimpleP48.

As long as the capsule is an electret, ie internally polarized, you just
need a FET and usually also a 1Gohm resistor.

Thanks,
-Scott

On 8/31/24 16:31, Charles Clark via groups.io wrote:
> I have several 25mm Chinese electret capsules without internal FETs.
> How do I add a FET to one to make it like the TSB2590A?? And can I use
> any FET to do it ?? ? ?Also , In another topic I see an SMD circuit
> board being used. Are these available from PCBWAY or are they not
> commercially available??
> Thanks.... Charles
>

--
---- Scott Helmke ---- scott@... ---- (734) 604-9340 ----
"I have ceased distinguishing between the religious and the secular,
for everything is holy" - Joe Henry







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