This long interval timer was found in the September 1976 issue of Radio Electronics magazine. The output can be used to control a relay. The circuit achieves timings of up to 14 hours.
This circuit that appears in similar versions on this site was found in a Popular Electronics from the...
This circuit is based on the bistable configuration, but with the difference that the values of...
This circuit was found in a Popular Electronics from the 90's. The circuit has gained 10 to 20 dB...