This inverter with the 555 IC provides a high voltage output, but very low current. We found it in an 80's documentation. The transformer is according to the desired voltage.
If the input voltage falls below 12 V the LED glows up. Other voltages can be monitored by...
Found in an old Popular Electronics, this circuit warns when a remote lighting system is not...
This generator is more complete than the previous one, being able to generate pulses as indicated...