This circuit turns your air conditioner or other appliance on and off in adjustable cycles to save energy. The circuit is from a 1983 Electronics Experimenter Handbook Special projects.
An interesting and versatile filter circuit, suggested by National Semiconductor is the one shown...
Found in na 1970 EDN this circuit has a parallel regulation providing a symmetrical output of 15 V....
This circuit was found in an American magazine 73 for radio amateurs of the 80s. It is an...