UK Vintage Radio Repair and Restoration Discussion Forum - View Single Post - Balanced audio O/P from 3-terminal electret capsule.

julie_m · 20th Jul 2019, 5:20 pm

The usual type of electret mic insert uses a FET as an internal preamp, in a circuit that certainly does not look hugely different from a phase splitter if you connect a resistor in series with the source and drain ..... It's got to be worth a try! You might need a high-value capacitor from one end of the battery to the outer shielding of the mic cable.

20th Jul 2019, 5:20 pm	#6
julie_m Dekatron Join Date: May 2008 Location: Derby, UK. Posts: 7,735	Re: Balanced audio O/P from 3-terminal electret capsule. The usual type of electret mic insert uses a FET as an internal preamp, in a circuit that certainly does not look hugely different from a phase splitter if you connect a resistor in series with the source and drain ..... It's got to be worth a try! You might need a high-value capacitor from one end of the battery to the outer shielding of the mic cable. __________________ If I have seen further than others, it is because I was standing on a pile of failed experiments.