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.
This circuit appears elsewhere in this section, but taken from other sources. This is an English...
Found in a 1975 radio amateur publication, this simple oscillator is for code practice. The PNP...
This circuit for some amps was found in a 90s Radio Electronics. The voltage can be between 6 and 25 V...