Found in Motorola documentation from the 90s, this circuit makes use of a triac from that time. The circuit is for the 110 V mains but can be modified for other grid voltages.
This circuit was obtained in a Popular Electronics of the 90s. It against a kitchen hood based on...
Found in the August 1993 Electronics Now magazine, this circuit employs two symmetrical source 741...
The 50 kHz signal generated by this circuit is applied to a low impedance inductive transducer. A...