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Electronics => Beginners => Topic started by: Bob Sava on June 18, 2021, 03:26:48 pm

Title: What to put in the place of desoldered microphone?
Post by: Bob Sava on June 18, 2021, 03:26:48 pm

After de-soldering a microphone, to keep the circuit from picking up any noise, should I solder a resistor or leave it open?

Title: Re: What to put in the place of desoldered microphone?
Post by: fcb on June 18, 2021, 03:58:08 pm

It depends.  If it's a condenser microphone then leaving it o/c will be fine.  You might find that some AGC in the system winds the gain up - again it depends on system.

If you're concerned about it floating about then perhaps add a 1K5 in it's place (I've seen a few of condenser mic's are powered from 3.3V via a 1K5 or so), else you could put a capacitor of perhaps 100nF (risk it acting as microphone if you're unlucky).

Prob's just try it.

Title: Re: What to put in the place of desoldered microphone?
Post by: ejeffrey on June 19, 2021, 01:34:12 am

A resistor to ground reduces the chances for hum pickup if you care. Probably leaving it open is fine.