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OscarFoxtrot · 21st May 2020, 1:14 pm

I can't trace the IC number.

The wires on an electret mic capsule must be kept very short to avoid interference, so it's normal for there to be a preamplifier very close. In GPO/BT phones with an electret transmitter the mic and the preamp are formed together in the transmitter.

21st May 2020, 1:14 pm	#2
OscarFoxtrot Heptode Join Date: Apr 2011 Location: Edinburgh, UK. Posts: 805	Re: GPT Reliance E Link 101 telephone I can't trace the IC number. The wires on an electret mic capsule must be kept very short to avoid interference, so it's normal for there to be a preamplifier very close. In GPO/BT phones with an electret transmitter the mic and the preamp are formed together in the transmitter.