This is an improved circuit from the earlier version also found in the April 1972 Radio Electronics magazine. The power transistors must be provided with heat sinks.
We found this circuit in a 1977 Radio Shack documentation. The circuit should be powered, for...
Found in American documentation from the 90s, this circuit uses a GASFET of the time. The circuit is...
This circuit generates pulses when the light beam incident on the phototransistor is interrupted. The...