Float Charger

MikeML

Joined Oct 2, 2009
5,444
I just bought one of those at Harbor Freight. Paid $4.99 with a coupon. Seems like a bargain.
Take it apart, and trace out the schematic. I have one of those from the early 2000s and it uses a LM7805. The early ones put out too low a voltage, so I had to change a resistor. I am curious what the newer ones use...

Hook it to an isolated lead-acid battery for a few days, and then measure the battery terminal voltage with a known-accurate DVM. I would like to know what the final float voltage settles to.
 
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