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.
I found this circuit in a doc umentation from the year 1968. It uses germanium transistor and has...
This circuit produces sounds that depend on the measured voltage and that can be compared with a...
This circuit was found in American documentation from the 90s. It serves as an amplifier for a...