how to build low cost universal battery charger schematic - circuit diagram

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1 of 3 8/4/2011 12:56 PM

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How to build Low Cost Universal Battery Charger

Schematic

Description

Here is the circuit diagram of a low cost universal charger for NiCD - NiMH batteries. This

circuit is Ideal for car use. It has ability to transform a mains adapter in to a charger . This

one can be used to charge cellular phone, toys, portables, video batteries, MP3 players, ...

and has selectable charge current. An LED is located in circuit to indicate charging. Can be

built on a general purpose PCB or a veroboard. I hope you really like it.

Picture of the circuit:

Circuit diagram:

Parts:

R1 = 120R-0...5W

R2 = See Diagram

C1 = 220uF-35V

D1 = 1N4007

D2 = 3mm. LED

Q1 = BD135

J1 = DC Input Socket

Specifications:

Ideal for in car use.

LED charge indication.

Selectable charge current.

August 4, 2010 - category: Battery charger

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2 of 3 8/4/2011 12:56 PM

how to build low cost universal battery charger schematic - circuit diagram

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