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.
This circuit can be used in AM and FM receivers to cut off the peaks of a signal functioning as a limiter...
When the sensor, an ordinary photo-transistor, receives light, the relay closes its contacts. The...
This circuit transforms your low sensitivity analog multimeter into an electronic voltmeter with...