Used in radio reception, this circuit was found in the February 1983 Radio Electronics magazine. The integrated circuit is the NE570 IC, and the power supply is 3.6 V.
This automotive tachometer circuit uses a FET and a 1 mA full-scale instrument. We found it in the...
This amplifier with very high input resistance has variable gain and must be powered by a...
This experimental receiver for the medium wave band uses a germanium transistor that can be...