ben1990 Posted May 27, 2013 Report Share Posted May 27, 2013 Hey guys, bought a 12v 1 amp automatic sealed lead acid battery charger yesterday for a project, cut mains plug off and alligator clips off and hardwired it into a project, left in original case. It worked fine for about 10 minutes and a loud buzzing started. I unplugged it and it stopped. Double checked wiring and polarity, all fine. I disconnected the charger from the batteries and it stops, although a faint hum is still audible from the transformer. I pulled it apart to double check the noise was coming from the transformer, and it is. its a typical laminated iron core 240v primary to a centre tapped secondary, disconnected the transformer from the board, and open-circuit voltage is 42v across the whole secondary and 21v between each end and the centre tap. Anyone had a transformer act like this? Should I solder the leads back to the board and just let it run to see if it goes away? Not real keen on an electrical fire haha. Any help appreciated. Note: warranty is probably out of the question seeing as I cut the mains plug off and the alligator clips. Was only $20 bucks but still, would like to not have to resort to another charger. Quote Link to comment Share on other sites More sharing options...
Hero999 Posted May 29, 2013 Report Share Posted May 29, 2013 The voltage are what you should expect - nothing wrong there. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.