When the 24 V battery voltage drops below 18 V, this circuit cuts off its discharge. The circuit is from 1968 documentation. It can be adapted to operate with other voltages.
This basic circuit is from 1984 documentation. This circuit can be used as an efficient burglar alarm...
This circuit using only transistors was found in documentation from 1977. The frequency is 4250...
The circuit shown has the advantage over the reductions with resistors to have a much higher...