12V Nicad Battery charger 200mA/H

12 V Nicad Battery charger

This 12V Nicad Battery charger 200mA/H circuit charges the electric battery at 75 mA until the battery is charged, then it cuts down the current to a trickle rate. It’ll fully recharge a dead nicad battery in 4 hours and the battery can be left in the  Nicad Battery charger for a long time.

Setting the shut-off point, connect a 270 ohm, 2-W resistor across the charge terminals and adjust the pot for 15.5 V across the resistor.

Parts list :
R1 : 1K
R2 : 68ohm
R3 : 2K
D1, D3 : 1N752
D2 : 1N4001
T1 : 2N2219
T2 : 2N2222
VR1 : 10K
Power supply is an electronic device that supplies electric energy to an electrical load. The primary function of a power supply is to convert one form of electrical energy to another and, as a result, power supplies are sometimes referred to as electric power converters. Some power supplies are discrete, stand-alone devices, whereas others are built into larger devices along with their loads. Examples of the latter include power supplies found in desktop computers and consumer electronics devices.


Tags: 12 V Nicad Battery charger 12 V Nicad charger Nicad Battery charger Nicad Battery charger circuit

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  1. author

    Jerry Seerungum5 years ago

    hi….what changes do i have to make to produce a current of 100mA instead of 75 mA….and how did you came up with those resistors values?what calculations do i need to do to get that?

    • author

      Damir5 years ago

      i think by changing R2