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.
The circuit shown in the figure can generate signals up to 1.6 GHz. Coil L1 and capacitor C2 are...
The LM2904 is not very common today, but common comparators and operationals can be used in the...
Found in a 90s R-E Experimenters Handbook, this circuit amplifies signals from 100 Hz to 3 MHz....