This circuit uses an LED (called SSL) to regulate current in a configuration with complementary transistors. The circuit is from 1970 General Electric documentation.
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...