Two transistors on a regenerative switch are used to trigger a triac. This circuit is from the RCA Power Circuits manual. Transistors admit equivalents.
This circuit generates a pulsed tone whose frequency depends on C2 and whose flashing depends on...
The circuit shown is from the GE semiconductor manual of 1977. In the table we have the values of the...
We found this circuit in a Popular Electronics of the 90s. The MOSFET can be of any type,...