Using a CA3030, this circuit was found in the May 1988 Radio Electronics magazine. The power supply must be symmetrical.
This precision circuit can provide timings from 0.2 milliseconds to 3 minutes accurately. The...
This circuit uses a phototransistor as sensor. The changes in the resistance of the transistor,...
We found this circuit in 1980s documentation. It can be used independently as CW or by exciting a...