We found this circuit in the October 1996 Electronics Now magazine. The circuit uses LDRs as sensors and drives relays. The relays must have voltages according to the power supply.
This circuit for several frequencies was obtained in an American documentation from the 90s. The...
The 2 uF capacitor used in this circuit must be of excellent quality with a minimum of leakage to...
When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit...