Build an 8 Volt Adjustable Battery Charger

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Build an 8 Volt Adjustable Battery Charger

Postby JohnMihevic » Sat Aug 31, 2019 9:07 am

This circuit will help if you have an 8 Volt battery in your cub. I built this adjustable 8 Volt battery charger for my friend that had an 8 Volt battery in his model T Ford. The circuit is shown below. It uses a standard 12 V charger and then drops the voltage using diodes that are forward biased and drop about 0.5 volt across each diode. The rate of charge is controlled by which diode is connected to the battery.

The diodes are available from Newark electronics (part # 76k5515) and cost $0.93. Any standard terminal strip will work. The maximum current the diodes can handle is 6 amps.

John M.


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Re: Build an 8 Volt Adjustable Battery Charger

Postby John *.?-!.* cub owner » Mon Sep 02, 2019 9:52 pm

Looks like it should work with no problem, but the newer smart chargers may not like it. Will probably need old style manual charger.
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