This timer with two unijunction transistors and one SCR was found in an American documentation from 1964. The unijunction transistors could be the 2N2646.
Found in a 1967 Delco documentation, this circuit can deliver power from 40 to 50 W at 8-ohm load....
This circuit is from a factory documentation (National Semiconductor) of the 80's. The power...
This 1968 Mallory circuit uses an uncommon integrated circuit today. The circuit has a 30 to...