This 5V power supply with a 1.5 to 3 A current was found in Maxim documentation from the 90s. The integrated circuit is the MAX741D.
This circuit for igniting gas flames was found in a 1967 Electronic Design. The SCR firing device is a...
We found this circuit in a 1966 US documentation. It simulates a variable capacitor that can vary...
Found in Radio Electronics, this circuit is intended to activate the lighting system of garages...