This circuit was found in an 80's General Electric documentation. The circuit uses uncommon components today like the PUT. Unijunction admits equivalent.
This is a traditional complementary-output transistor amplifier sourcing 2 to 4 watts to a 4 ohm...
I found this simple circuit from an English magazine from 1984. The circuit can be easily...
This circuit for professional telegraph handlers automatically produces points and dashes. The...