This circuit was found as part of another project in a January 1988 Radio Electronics magazine. The frequencies are given by the timing capacitors.
This circuit was developed to find intermittent defects in an electrical control. In the event of a...
The circuit shown is from the 1994 Linear Applications Handbook from National Semiconductor. The...
Suggested by General Electric in 1965 documentation this circuit is intended for the 120 Vac...