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 circuit can be powered by 2 or 3 small batteries. The resistor can have values between 220...
More and more supercapacitors are being used as supplementary sources of energy in several...
This circuit for ceramic cartridges was found in the March 1993 issue of Electronics Now magazine. Q1...