[TenTec] Electret Mic voltage vs. Dynamic Mic

[Richard B Drake]

Maybe some of the older rigs don't provide the +4 volts on a
seperate pin (pin 4) as the Omni VI Plus does. On the 705 Mic, the
+4 volts from pin 4 is connected to the Mic input through a 22k
Ohm resistor internally to the Mic. If you don't connect up pin 4
there is no voltage. So, to use a mic that doesn't want to see any
voltage why wouldn't one just not connect anything to pin 4?
Please straighten me out.

---
73, Rich - W3ZJ

> -----Original Message-----
> From: owner-tentec@contesting.com
> [mailto:owner-tentec@contesting.com]On
> Behalf Of Dr. Gerald N. Johnson
> Sent: Friday, April 21, 2000 12:00 AM
> To: K & H Darwin
> Cc: TenTec List
> Subject: Re: [TenTec] Electret Mic voltage vs. Dynamic Mic
>
>
>
> Some ham mikes are transformer coupled but the
> transformer core is so
> tiny that its easily saturated by DC current to cause
> distortion. Still
> needs the coupling capacitor.
>
> 73, Jerry, K0CQ

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