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Anyone have a link for a build it yourself car battery charger?

Apr 21st, 17:31

N1AUP

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
I need to buy a 2 amp, battery charger / maintainer to keep the batteries in my tractor fully charged if the equipment sits.

I know there are a ton of commercial chargers on Amazon, but everyone is complaining about them. I'd like to build a heavy duty, high tech, 12 volt battery charger / maintainer that I can attach to the battery bank on this tractor (two type 31s), and let it go.

Does anyone have a link to a kit, or a set of plans to build something first class?

Thanks.
Apr 22nd, 07:18

W1VT

Super Moderator

Joined: Apr 4th 1998, 00:00
Total Topics: 0
Total Posts: 0
A&A Engineering has a circuit board for a 5A UM3906 based charger. The 1A version was published in QST.

The UM306 is an application specific IC designed by Unitrode that uses temperature tracking to improve charging accuracy.
http://www.a-aengineering.com/155PCA.htm
This slow analog design has fewer RFI issues than other approaches.

Zak W1VT
ARRL Senior Lab Engineer

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