You can make a good 12v adapter for multi purpose use.you needs A 0-12 2A Stepdown transformer, 4 5408 Diode, 1 cap. 2200uf 25v, and some wires.
Coleman 6v / 12v battery charger and maintainer Model 60130
Amazon link: http://amzn.to/2lZgl76
Incredible how to make 12v lead acid battery charger very easy https://youtu.be/eme0oRNlE3o just need a laptop charger rated 19v and some amps in the video it is an HP laptop charger rated DC 19v |2.31A but to stay on the safe side you should consider just half of that power.And the secret component is an auto bulb rated at 12v 5W.In this configuration the battery is charged with 0.26A so is very safe but watch the bulb it can get hot, to increase the output you can change the bulb with a 10W same auto filament bulb and you gonna have 0.45A, if you want more try with 20w bulb you should get approx 1A.This can be considered 12v battery hack because is not a normal 12v battery charger.
Or if you buy a cheap and good small 12v battery charger http://amzn.to/2i9zfpM it does the job for the price
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BATTERY CHARGER| 12V BATTERY CHARGER| HOW TO MAKE 12V BATTERY CHARGER|12V cHARGER| 12V TRICKLE CHARGER|
I got this charger from Aldi it’s a good charger it’s a good quality one but still works good
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in today video we share amazing idea that How to make 12v bike battery charger at home easy step by step with circuit diagram.
its very easy and cheapest project. i use simple 12v transformer, some diodes and one capacitor. see full video and make it same.