This circuit is from Radio Electronics from March 1977. The integrated circuit is from that time and the circuit is intended for an infrared audio link. The modulation is in pulse frequency.
This microphone preamp found in a 1995 documentation offers stable microphone operation. The...
This high input impedance amplifier stage was found in a 1963 documentation. The transistor...
We found this oscillator in an English documentation from 1977. The symmetrical supply, in fact,...