The figure shows how to couple two CMOS circuits using an optical coupler to achieve isolation. The circuit is from a Radio Electronics from August 1992.
This circuit hás a Power output of more than 1 W. It is used in small experimental or low power...
This simple timer or timer activates a low current bell or a buzzer according to the supply...
This circuit with germanium transistors was found in documentation from the 50's. The transistors are...