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.
In the presented receiver, from a 1964 documentation, a transistor is used as a detector,...
This circuit can be used in broilers, greenhouses, drying chambers to regulate the temperature in a simple...
This circuit for controlling high power LEDs (up to 2A) is from a General Electric documentation from...