This circuit is the receiver for the transmitter from the previous project. We also found it in the Radio Electronics Experimenter magazine, 1989 issue.
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...