Found in 1967 documentation, this circuit makes use of period transistors and drives a common light bulb. Nothing against it being adapted to use LED.
We found this circuit in the March 1992 Radio Electronics magazine. The circuit provides 100 Hz...
This circuit is from old documentation. Based on two operational amplifiers of the time, it can be...
Relays from 20 mA to 200 mA can be driven by this sensitive circuit.6 or 12 V relays can be used...