This shield with full-wave triggering was found in the Radio Electronics Experimenter magazine of 1989. The Triac must be according to the load that must be controlled.
This circuit can be used in PLL, frequency synthesizer in FM and VHF receivers, reducing a...
We found this circuit in an old documentation. Transistor can be BC548 and relay according to...
This is a typical 3 ½ digit TTL counter. We found it in the September 1973 issue of Radio...