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.
We found this circuit in the 1990 Radio Electronics Special Projects magazine. The circuit has a...
This circuit of the 1970s uses Germanium transistors. Changes can be made to use silicon...
This circuit is implemented with operations that are not common today but can be assembled with...