This low current source without a transformer is intended for applications where insulation is not important. The circuit has a 110 V (120 V) input and was found in old American documentation.
Using a capacitor as a sensor, this circuit was found in the 1989 Radio Electronics Experimenter magazine....
Using bipolar, FETs and unijunction this long-lasting timer can reach 10 hours with good quality...
This circuit is found in an American documentation from the 80's. The circuit measures the power of...