This circuit was found in a 1980s documentation for amateur radio. The circuit is for 9 MHz signals and values in parentheses for FI of 455 kHz. The circuit can be adapted to other frequencies.
This digital mixer uses CMOS integrated circuits. The circuit was published by us in a magazine...
This 6 V battery charger was found on a 1987 Hands On Electronics. Rc determines the charging...
This circuit regulates the output voltage of a 78xx according to the light incident on the sensor....