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 configuration was found in a 1976 documentation. Note the use of pin 4 input for reset. The...
This circuit, found in documentation from the 1990s, uses a common 7-segment LED display. The...
This circuit is suggested by National Semiconductor in its Linear Applications Handbook. It makes...