Found in old documentation, this circuit makes use of amplifiers of the time, uncommon today. Next to the diagram, the formula for calculating the components.
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...