This two-microphone amplifier was found in a April 1961 Radio Electronics Magazine. The circuit is powered by battery and has a 600-ohm line output.
STMIcroelectronics automotive L9907 FET drivers can be purchased from Mouser Electronics. These...
This circuit is suitable for applications such as a TTL log digital link. Maximum frequency is...
We got this circuit from Radio Electronics from July 1990. The circuit mimics the sound of the red...