This amplifier for playback of recordings was found in a 1947 manual. It uses a push-pull output with a tube power supply.
This ultra-simple circuit need a carbon microphone to operate. The circuit must be powered from D...
This logarithmic operational amplifier was found in the September 1994 issue of Electronics Now...
This circuit was found in an American 1980s documentation. It makes use of an unusual MOSFET today...