The Shop > Electronics & IC Programing

Recharging non-rechargeable batteries

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dsquire:
Hi

A couple of years have gone by since this thread was started. How many people have built a charger like this and what were your results? Enquiring minds are curious.  :D

Cheers  :beer:

Don2300

mzt:

--- Quote ---A couple of years have gone by since this thread was started

--- End quote ---

Glad You resurrected it again.
Marcello

raynerd:
Has anyone got an build pictures for one of these. If anyone does build one, please take some step pictures if you don`t mind!?

Chris

andyf:
I didn't take any build pics, Chris. But it's just simple soldering; the hardest bit is finding a suitable box and fastening the transformer and a 12 x 20 hole stripboard inside it, and the battery holders to its outside.

Here's a pic showing how things are laid out, and the track breaks.

Diagram deleted.  It contained so many errors that John Swift kindly took it in hand and his corrected version version appears a few posts further down. Read the following paragraphs in conjustion with his diagram. 

This only shows four battery holders; as you will see from the first post, mine has four for AAs and another four for AAAs. Just use a 12 x 40 hole bit of stripboard and put another four sets of resistors and diodes on it, with further track breaks.

Component values are in a table in the first post. The diodes needn't be IN4001; just about any rectifier diodes will do. If you have a scrap transformer giving more than 4.5V, the calculations for it are in the fifth post in the thread. You want unrectified AC out of the transformer, so it's no good substituting it with a phone charger giving DC output.

Andy

modeng200023:
The layout in the picture won't work. The top transformer secondary wire is shown connected to an unused strip on the Veroboard. The wire should go to the first strip not the second.

John

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