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.
This circuit can operate with signals from 1.5 to 150 MHz. C1 is 36 pF and C2 is 4n7. The diode...
This circuit was found in a 90s Popular Electronics. It prevents the power from being switched...
Any high-gain Darlington transistor can be used on this touch circuit. The load can be formed by...