This circuit makes use of an integrated LM2907. The circuit is from an old documentation being applied to cars that still used platinum, common at the time.
The sensor of this circuit can be any phototransistor and the SCR can be the TIC106. The circuit and...
This circuit consists of a controlled charge to discharge batteries under test. The circuit is...
This amplifier from 100 to 150mW was found in a Japanese documentation from 1967. The circuit uses...