[Milsurplus] Carbon mic booster ?

[hwhall at compuserve.com]

That's an interesting idea!  You can find newer, working carbon buttons but it looks like in a T-17 body they'd still suffer from limited sound coupling thru those 3 tiny holes. A booster might be all they'd need to get good output level (without shouting) & retain the old carbon mike 'sound.'
 

 Wayne
WB4OGM

 

-----Original Message-----
From: Hubert Miller <kargo_cult at msn.com>
To: 'milsurplus' <milsurplus at mailman.qth.net>
Sent: Sun, May 29, 2016 2:14 pm
Subject: [Milsurplus] Carbon mic booster ?



I wonder if this would work for a carbon mic booster. Single transistor; base AC grounded, with bias thru resistor from collector; carbon mic from emitter to ground.
Collector to microphone hot wire. Transistor is fine with 1.5-3 volts mic supply. Amplification is low  due to low collector load – microphone transformer – but possibly
enough for a usable output boost. Only “advantage” is original carbon element stays in place. And, maybe you actually like “telephone voice sound”. 
-Hue 

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