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12v auto cut off battery charger circuit

#12vbattery #batterycharger #powersupply Auto cut off 12v battery charger Auto cut off 12 volt battery charger circuit 12 volt battery charger with auto cut off Auto cut off battery charger circuit 12 volt automatic battery charger How to make 12v battery charger auto cut off how to make auto cut off battery charger In this video i'm showing you how to make a easy and simple Auto Cut Off Charger For 12 Volt Battery 8ah to 100ah. There i have used few components including Relay & NPN Transistor. Input voltage should be fixed at 14.5v and when battery voltage will reach to 13.9 volts, circuit will automatically Cutoff the charging supply to battery and saves battery from over charging. This circuit is designed to give beep sound also to indicate battery is fully charged. WORKING You can see the bc547 is connected to one endof coil pin to switch relay & when it received enough current at base it will switch on relay. Usually we use preset to set cutoff voltage but here i have used fixed resistance. 10k connected to positive that provides current to 2.2k connected to base of bc547 to switch but to avoid early cutoff, i used 180+470 ohms to groud the current from 10 k Resistor and when voltage reaches to 13.9v there current also increases so 2.2k resistor finally receives some current to base of transistor, and relay turns on and Cut Off supply to battery. If you increase resistance then (180+470 ohms) cutoff voltage will decrease. If you decrease resistance then (180+470 ohms) Cutoff voltage will increase. 👉 Download circuit diagram link https://drive.google.com/file/d/18vnR... Join Group:   / 819126578700997   Follow Page:   / creativetechvids   Part List 12v SC Relay. BC547 / Bc548 Transistor. 180 , 470 ohms Resistor 1k, 2.2k, 10k Resistor. Red & Green LED. SR360 Schottky Diode. 1N4007 Rectifier Diode. 12v Buzzer ( optional ). Crocodile clip wires. Music Credits Corporate Music Only12 volt auto cut off battery charger