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.
We found this filter configuration in an old documentation. It is one of many possible ones that...
This circuit is from a 1964 Electronic Design book that presents application ideas for...
This linear circuit was found in a 1965 Electronic Design. The transistors are from that time....