Simple Ni-Cd Battery Discharge Limiter Circuit

This is a very simple Ni-cd battery discharge limiter electronic project can be designed like in this circuit diagram using few common electronic parts. This circuit is very simple and can be used in many compact designs. This circuit disconnects the battery from the load when the output voltage falls bellow a preset level. C1 charges through R1 and turns on Q2. This is the figure of the circuit;

Collector current flows through R2 turning Q1 on and battery is connected to the load. When the output voltage falls bellow a point set by RV1, Q2 turns off, Q1 turns off and further discharge of the battery is prevented. The maximum output that can be supported by this discharger circuit is around 3 amperes. At the input you can connect on or two 12 volt Ni-Cd batteries.