This bargraph circuit using LM3914 was found in the October 1980 Radio Electronics magazine. Note the use of a transistor to modify the response.
This circuit generates a constant current given by R1. The load is on the high side of the feed...
This selectivity multiplier circuit for 455 kHz IF receivers was found in American documentation from the...
PTT or Push to Talk is the control that switches the speak-hear function on a transceiver. This circuit...