In this circuit the triac conducts when switch S1 is opened. We found it in the October 1987 Radio Electronics magazine. The triac is controlled according to the load.
The purpose of this circuit found in a 1967 GE SCR manual is to control a heating element. The SCR...
This circuit was published in a 1981 magazine, but it can be easily assembled using a BC548 paraQ1...
This benchtop power supply with various output voltages from 1.5 to 12 V was found in Radio...