/diy/ - Do It Yourself

>>2807361
here's a battery charger I hacked together from an old 16mm film carrier, a scavenged transformer from an old timey battery charger, a bridge rectifier, and a fully adjustable buck converter. I also bought the last 2 battery charger timers in existence.

>>1747218
I don't know what a "transformator" is.

First question What is the ratings of your transformer? how many amp and volts does it output exactly?

What size batteries will you be charging? Car? Lawn Tractor? A giant ass battery used to start big ol' diesel engine? what?

Yes there are ways to limit the amps. The simplest used in old fashioned car battery chargers was a self resetting 15 amp circuit breaker. It would just sit there and chatter away until the current draw went down.

Now a days a buck converter will do that. But you will need one with a big ol' heat sink and adjustable Constant current.

also you're output voltage needs to be between 14.4 and 15 volts. No higher than 14.4 for sealed lead acid batteries.

Here's one I built

>>1745725
12 volt battery charger

>>1702127
battery charger built with the transformer from an old timey charger, a 16mm film transport box, various gauges, parts and the last battery charger timer on the internet.