Obtained from a 1969 documentation, this circuit can operate at frequencies up to 500 Hz, counting up to 999. The circuit makes use of neon lamps of the time.
This circuit, which appears elsewhere in this section but from other sources, was found in a book...
This circuit was obtained from Popular Electronics from June 1978. It doubles the input DC...
Two transistors on a regenerative switch are used to trigger a triac. This circuit is from the RCA...