2. Re: Phantom power noise - again!!!

["Raimund Specht" animalsounds]

umashankar wrote:

>> http://www.beis.de/Elektronik/HF-Mic/HF-Mic.html
> pin 3 is driven by the two transistor circuit, but what drives pin 2?
> it is connected with a 22 mfd cap to positive. the positive supply of
> course is effectively at ground.

No, the positive supply (+38V) is not effectively at ground - it just
drives  pin 2 (through the second 22 mfd capacitor, C15). There seems
to be a virtual ground at '+28V'. So, the supply voltage for the
output amplifier (T3, T4) is blocked by the 100 mfd capacitor (C14).

Regards,
Raimund