Found in Philips documentation from 1968 this circuit operates at frequencies up to 10 MHz with 76 dB gain. The double transistor can be replaced by a matched pair.
This circuit was found on a Radio Electronics of July 1984. It consists of a source with the 741...
This receiver for an audio link by modulated light was found in a 90s Elektor. Transistors are common...
We found this circuit in a Radio Electronics from October 1963. The circuit uses an output...