In circuit I added one switch (on/off)and one 5A diode(reverse protection) (In some video they will connect multimeter and they set the cut off voltage but if I connect multimeter it will showing maximum voltage only so I can’t able to set cut off voltage) I set a cut off voltage at 13.5 volt but while setting 13.5v I have faced some issues due to hanging wires now it’s resolved but still 10k pot resolution is very less I can’t able to set exact value simply if I just touch the pot cut off voltage will jump 1v like that.įor example from 13.5v cut off voltage to 13.7v I am unable to set it small rotation will go more than 14v so please let me know how you selected 150 resistor and 10k pot in the design and also let me know by changing this value I can achieve more resolution or not.Īnd also I have one more query like to set cutoff voltage I am used fully charged lead acid battery is there any easy way I build a circuit as mentioned in your website (upto 10A circuit).Ĭurrently I am using 12-0 transformer and bc 547 for auticutoff and 10k pot for to set cut off voltage. I am designing a lead acid battery charger with autocut off feature. 7808 voltage regulator is used for constant supply to the operation of the circuit to cut at a required fixed voltage. One 555 timer ic is used for detecting the voltage level and Relay is used to disconnect the AC input. 12v battery charger with auto cut off circuit diagram And Input Power to the Transformer of charger is also Disconnected by Relay. When Battery needs charge then Red Led glow, When the Charge level goes to about above 12v or 13v then the Red LED will OFF and the Green LED will Glow.

Timer Kit - Mechanical 120 Minute w/Hold Position 1/4 (6 MM) D-Shaft 3/8 Threaded. One terminal of Input AC power to Transformer connected through 12 V Relay. The parts you need to repair your battery charger - priced right. Once the auto cut voltage is set, the circuit is ready to use. And move the preset till the green led ON. Energizer Recharge Smart Charger With intelligent features like a countdown timer and bad-battery alert, the Energizer Recharge Smart Charger is one smart choice in high-performance charging. This voltage range can be set by using any 13v or 14v DC supply which connects the terminals which go to the battery.

This adjustment is done by the moving 10k preset, and for testing of output voltage auto cut range a multimeter connected with the output terminals that go to the battery. Before the use of this circuit, you need to adjust the Cut off voltage range for the auto cut. Timer sockets can also be of great assistance, allowing you to set a specific. This 12 battery charger circuit provides the Automatic cut-off facility when the battery gets fully charged. That is where power banks, battery chargers or USB car adapters come in. 12v Battery Charger circuit with Overcharge Protection

Smart timer charger battery charger