[Milsurplus] SIMPLE Carbon Microphone Substitute.

[Mike Feher]

Yes, that would indeed make sense. 73 - Mike 

Mike B. Feher, N4FS
89 Arnold Blvd.
Howell, NJ, 07731
732-886-5960 


-----Original Message-----
From: Milsurplus [mailto:milsurplus-bounces at mailman.qth.net] On Behalf Of
AKLDGUY .
Sent: Sunday, May 29, 2016 8:12 AM
To: milsurplus
Subject: Re: [Milsurplus] SIMPLE Carbon Microphone Substitute.

A couple of readers have said that a FET stage ought to be used to drive the
2N3569 transistor in David's circuit, shown here:

https://goo.gl/photos/26HUmzVuqhZKWrNZ7

I strongly suspect that the mike he's using already has a built-in FET stage
that in this circuit is configured as a source follower whose low impedance
output drives the base-emitter junction of the transistor.

73 de Neil ZL1ANM
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