This is the circuit diagram of a very powerful and efficient Ni-MH battery charger using IC LT4060 from Linear Technologies. In addition to Ni-MH batteries Ni-Cd batteries can be also charged by slightly modifying the circuit.For charging Ni-Cd batteries connect the CHEM pin (pin12) of the IC to +Vcc.Here the circuit is configured to charge 2 cells connected in series. By altering the connections of SEL0 and SEL1 pins, upto 4 batteries in series can be charged using this circuit. For charging a  single cell, connect SEL0 and SEL1 pins to GND. For charging two cells, connect SEL1 to GND and SEL0 to Vcc. For charging  three cells,  connect SEL1 to VCC and SEL0 to GND. For charging 4 cells, connect SEL0 and SEL1 pins to VCC. The circuit also features temperature based charge qualification.An NTC thermistor connected at the NTC pin (pin11) of the IC serves as the temperature sensor.

Circuit diagram.

Ni-MH battery charger circuit


  • The circuit can be assembled on a Vero board.
  • Mount the IC on a holder.
  • Preset R2 must be set around 4K.
  • Type no of Q1 is not very critical. Any 3 to 5A PNP transistor will do the purpose.
  • LED D1 serves as  a charge indicator.



  1. seetharaman

    Hi Rohit you require an external ballast, you can use a 20 watt flurescent light ballast for this lamp as it has got its own built in starter. electronic balast for 2 pin 11watts available but i have not seen any for other rating in the market.

  2. Hello Seetharaman,

    Any suggestion on the above CFL image,

    Thanks for your advice

  3. Seetharaman

    Hi Rohit you donot require any ballast for these CFLs as they are with built in electronic switching supply to take care of 170 to 270 volts AC.

  4. Hello Seetharaman,

    Can you help me with a circuit diagram for a 26 watt CFL, single pins (only two pins on the 26 watt CFL). I picked up some CFL’s and I found i cannot find ballast in india for these.
    Thanks and regards

  5. thank you sir SEETHARAMAN. I’m searching for the circuit of 20w flourescent lamp electronic ballast. hoping for your reply. soon!

  6. what ic can be substitute for LT4060? I NEED REPLY SOON!