This circuit is from a 1969 EEE magazine. The transistors are from that time, but the circuit can be implemented with modern equivalents, such as 2N2646 for Q3.
This circuit was found in an American 1980s documentation. The components are current but most...
Found in a Popular Electronics from the 90s, this circuit applies to flashes with xenon lamps. The...
Found in old documentation for radio amateurs, this circuit is intended to excite a MOSFET on the...