This resistive sensor was found in a 1969 US documentation. The circuit uses transistors of the time, but current equivalents can be employed.
Found in a PE Hobbyst Handbook, this circuit checks if there is voltage in a power outlet by...
This circuit can control the power from 0 to 70% of the maximum power on a load. The circuit was...
This circuit was found in a PE Hobbyst Handbook from 1992. The second oscillator is a VFO. The...