Found in a 90s Radio Electronics, this circuit uses an AD590 or AD592 for remote temperature transmission. The circuit produces a voltage of 1 mV for each degree centigrade.
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...