Other versions exist on this site from various publications. This one is from the Radio Electronics Experimenter from 1990. The bargraph circuit uses the UAA170.
This circuit is tuned to reject stations of different wave bands that may be interfering with the...
This circuit generates a 5V rectangular signal. The circuit is suitable for calibrating TTL...
This circuit has a 2 V full scale using a 4-and-a-half-digit A / D converter. The circuit is...