71Views5Replies

Author Options:

DIY ±18VDC to power a dead cordless drill Answered

Hi!
My last battery died on my cordless drill and i'm trying to transform it to a corded drill.

My plan was to use a microvawe transformer along with a bridge rectifier (KBPC5010  Bridge Rectifier Diode, KBPC Series, Single, 1 kV, 50 A, 1.2 V, Module, 4) to power the drill. 120VAC from the wall to, I wish, 12to18VDC.
The problem with this is the voltage given by the output of the microwave transformer is of only ±3VAC.

Any sugestion?

Discussions

The forums are retiring in 2021 and are now closed for new topics and comments.
0
rudecam
rudecam

5 years ago

I was also thinking about using smaller transformers and connect them in series to increase the voltage....

0
killerjackalope
killerjackalope

5 years ago

Charity shop, laptop charger, if you've modded a microwave transformer for a high amp output you'd need to make your secondary with six times as many windings to make your voltage, granted I think there'd be less effort and cost in going the laptop charger route.

0
rudecam
rudecam

Reply 5 years ago

Hi Killerjackalope,
Laptop charger aren't putting out enough amps for the tools. Many seemed to have tried it.
I'm not familiar with modded microwave transformer. Tell me, is "MOD" stands for "modified"?
I've researched the web after reading your comment and I believe I have found something solid thank's to you.
https://www.youtube.com/watch?v=3eSXXnKOW5k

Granted It's impressive from a begginer's point of view.

0
Downunder35m
Downunder35m

5 years ago

Switchmode power supply is the way to go.
If you are lucky you might even find one that will fit into the battery case.

0
rudecam
rudecam

Reply 5 years ago

Thank you for your reply Downunder35,
franco40 did exactly what you've suggested. he used a Meanwell 15V 23.2A 350W AC/DC for ±50$us to power his tools. However, from reading the comments, I suspect I might be a little undershot. A 500W powersource might be more appropriate.
https://www.instructables.com/id/Cordless-Power-Tool-Conversion-18VDC-to-120240VAC/

It will be my backup plan if I fail to build the powersource myself.