This circuit turns off a load after an interval of 8 to 80 seconds adjusted on the potentiometer. The circuit is from a Radio Electronics June 1970. The time depends on C1 and can be changed.
This circuit was originally designed for testing crystals used in color televisions, but it works...
This circuit was found in the February 1995 issue of Electronics Now magazine. It can double the...
The figure shows how to use an LM3914 with a variable range moving point. The circuit has an...