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 was obtained from a 1966 General Electric manual. The circuit applies only to...
This Vienna bridge multi-band oscillator circuit was found in a 1974 Ferranti transistor manual. The...
This circuit is intended for communications receivers. We can find it in a documentation from the...