Bridge Rectifier with a center tapped transformer

[jbefumo]

[quote="Phil_S"]Using the CT to ground will either blow the fuse, let the smoke out, or both. Don't ask me how I know this. Good luck.[/quote]

DRAT!

Wish I had read this FIRST!

[jbefumo]

[quote="Phil_S"]Using the CT to ground will either blow the fuse, let the smoke out, or both. Don't ask me how I know this. Good luck.[/quote]

Yeah, so, I did precisely this to a nice Hammond power transformer. Question: any possibility of repairing it? Where would I look, and what would I be looking for? I'm guessing the problem will be on the secondary side? Hate to just drop in in the trash without at least TRYING to fix it.

thanks.

Joe

[randalp3000]

Run a Duncan power supply analysis. It will give you the current draw calculations so you can see if your trannie is up to the job. Skip

Thanks, I missed this one and it will come in handy.

If I can figure it out, edit

[Firestorm]

Using the CT to ground will either blow the fuse, let the smoke out, or both. Don't ask me how I know this. Good luck.

Yeah, so, I did precisely this to a nice Hammond power transformer. Question: any possibility of repairing it? Where would I look, and what would I be looking for? I'm guessing the problem will be on the secondary side? Hate to just drop in in the trash without at least TRYING to fix it.

thanks.

Joe

Toast. Sorry. Once the insulation melts, bad things happen. I suppose it could be rewound at much greater expense than new. Never worth it for PTs, IMO.

[Vilhelm]

I used a full bridge rectifier and didn’t use the center tap. When I saw the size of voltage increase, I immediately rectified the situation with the center tap and two less diodes. The xfrm worked for about two days after that and then just quietly died. It was a 60 year old Roberts reel to reel PTX. Had a good life I suppose. It didn’t hurt the capacitors so it must’ve just finally been too much for the old girl. Or it could’ve been coincidence. It was working fine before that tho.

[LOUDthud]

Most basic rectifier circuits are covered here: https://www.hammfg.com/electronics/tran ... /rectifier

If you don't understand all of these circuits, be sure to use a light bulb limiter.