This is an amplifier circuit intended for modulating transmitters. The 5-tube circuit is from an American manual from 1947. The power supply uses a transformer.
This RS flip-flop uses two type 4N26 optical couplers and is characterized by the very high...
This circuit is from an American 80's documentation. The integrated circuit is of the time and is no...
The figure shows how to increase the output current to about 50 mA of an operational amplifier. The...