This circuit was found in an American documentation from 1969. Indications of the used transistors are not given, but general-purpose types can be tested.
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...