This circuit was found in a 73 magazine for radio amateurs from the 90s. The circuit uses high voltage transistors and the relay is high voltage as well.
This is a conventional triac dimmer configuration found in a 1986 documentation. The triac used is a...
This circuit uses a pressure switch to turn a relay on or off. The supply must be 6 or 12 V...
Wired to the output of any amplifier this circuit makes an incandescent lamp flash according the...