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

Apr 21st 2021, 17:31


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?

Apr 22nd 2021, 07:18


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.
This slow analog design has fewer RFI issues than other approaches.

Zak W1VT
ARRL Senior Lab Engineer

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