Replace electric screwdriver's battery to a transformator

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Zedman

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I got a electric screwdriver with 14.4 V/1.2Ah accumulators,
but the accumulator seems to be dead.

As I usually using it indoors, I would like to replace the battery
with a transformator, to be able to operate it from 220V mains.

What kind of transformator should I use?

please help,
thanks
Zed
 

Re: Replace electric screwdriver's battery to a transformato

I don't understand if you want put it inside the screwdriver...
however you can use a simple transformer of about 40VA 220/12Vac ,a C filter and a zener/bjt voltage stabilizer made by a TIP 41, 2n3055 or other.

Lollo
 

I would like to put it into the dead battery's cover,
would you please show me a small schematic about
that stabilizer?

thanks,
Zed
 

Re: Replace electric screwdriver's battery to a transformato

The transformer is too big to fit in the cover.
If you cannot have the transformer outside, you must build a primary switching converter which is much mode difficult to design and build respect to the first solution.

Lollo
 

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