How the circuit works –
Fig. 3: Prototype of Battery Over Discharging Protector
The base of the transistor Q2 is connected to the collector of the transistor Q1. Now at a voltage below 6.2 V the transistor Q1 will conduct but it will not in its full saturation state. That means the voltage difference between the collector to emitter of Q1 is very less but it has sufficient voltage which can drive the base of the transistor Q2.
Filed Under: Electronic Projects