This circuit interrupts the power supply when grounding is missing. The circuit is from an old documentation (from the 80's) using current transformers and other components of the time.
We found this two stage transistor amplifier circuit using RC coupling in a magazine published in...
With a touch of S1 this circuit keeps a small strand of nichrome warm enough to light a cigarette....
August 2016 - It can be obtained from Mouser Electronics the new temperature and humidity sensors from...