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.
The sophisticated signal tracker/follower with a JFET and integrated circuit 741 was found in a...
The gain of this circuit is given by the value of R1 that depends on the current in the...
This electronic switch published in the July 1970 Radio Electronics magazine allows the...