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 interesting FET-tester circuit was obtained from an old American documentation. The bipolar...
Found in a 90s Electronic Design, this suggestion to have a higher voltage in a fixed regulator...
This circuit was found in the July 1994 issue of Electronics Now magazine. The relay can be rated...