This circuit was found in a Radio Electronics from 1970. The coupler with LDR is from that time, but the circuit can be adapted to use modern components and act as a shield.
Found in English documentation, this circuit uses a thermistor as a sensor. The trigger point is...
This 1.5 A circuit is from the LM117 manual. The LM350 can be used for higher current, and the...
This ultra-simple tester and component gauge lets you perform continuity testing and even evaluate...