This circuit only works with incandescent lamps and the frequency is adjusted in the pot, depending also on the capacitor. The triac must be equipped with a heat sink. The circuit is from an 80s manual.
Found in 1967 Raytheon documentation, this circuit uses a company coupler consisting of a lamp and...
In a modern version this circuit can use an LED in series with a resistor in place of the lamp. The...
This circuit, when triggered, locks, and remains so until the source is switched off for a moment or...