This circuit, of a Popular Electronics of 1969 is destined to firing a gas LASER of the time. The circuit makes use of a high voltage transformer for triggering.
This circuit is from an old Italian publication, being used in record players with crystal...
The sensor used in this circuit is uncommon today, however equivalent types can be tried. The...
This circuit was taken from the 1974 Ferranti transistor manual. Transistors are common types at...