[NJARC] Microphone question

[Bill Zukowski]

Jules,

The attached diagram (modified in red from my microphone) presentation 
_should_ work.

For the transformer use an output transformer with a tapped secondary, 
preferably 8 ohms, tapped at 4.  Try 3 volts (polarity not important) in 
series with a 47 ohm (I estimate) resistor to limit current.

The connections are two the two screws on either side of the mic in the 
center.

This is all theoretical, but should work.  I'll try it myself tomorrow 
afternoon and let you know how it works.

With this circuit, the output will be very high compared to a normal 
microphone (hundreds of times), so connect it after any 
pre-amplification stages or use a pot to adjust/attenuate the signal, or 
try a single battery.

Now the legal stuff:
/"I shall not be held liable for any real or perceived damages or 
injury, direct or consequential, resulting from the use or installation 
of above circuit.  Your mileage may vary, close cover before striking."

/Thanks,
Bill/
/

Just remember
Reply = Poster
Reply All = Everyone

_________________________________________________________
A visitor at our museum today (J. Chris Hausler of the Morse Telegraph Club...jchausler at earthlink.net   ..)) needs to know how to set up and use a Western Electric 600A double button carbon mike. Anyone have info and a circuit?
  Thanks,
Jules


Jules A. Bellisio
   5224 Megill Road
   Wall, New Jersey, 07727-3685, USA
   +1 732 938 4431
   CellPhone: +1 908 770 0552
http://www.bellisio.com
jules at bellisio.com


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