This 10-minute timer was found in the July 1994 Radio Electronics magazine. The relay must be sensitive to the supply voltage used. The capacitors determine time ranges.
This is a field strength meter found in an 80's Hands On. The circuit operates at frequencies up to 500...
This circuit allows you to simulate an analog telephone line for the repair and testing of...
We found this circuit in the Linear Applications Handbook by National Semiconductor. It uses the...