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.
The LM381 integrated circuit is not very common today. The circuit is from an old publication, but it can be...
This circuit is based on the TDA3810N. We found it in the March 1992 issue of Radio Electronics magazine....
This is another quick adder that we found in an Electronic Design from the 80s. It also applies to...