Help with a rectifier

The Junk Drawer is for those Off Topical discussions where we can ask questions of the community that we feel might have the ability to help out.

Moderator: Harold_V

User avatar
Harold_V
Posts: 20231
Joined: Fri Dec 20, 2002 11:02 pm
Location: Onalaska, WA USA

Re: Help with a rectifier

Post by Harold_V »

spro wrote:Altogether fine. I don't know what amps or much about anything there. There are these little fuse things which can be obtained for different temperature. They would be in series but with 120 or 250 v they break with heat. You can determine max heat temp and they will blow like a fuse. I've looked at them and there are many between 160f and 260f. Not to make it more difficult but something to consider when things get too hot yet don't trip a breaker.
A thermistor, if memory serves. (I may be wrong---I am not an electronics guru.)

In this case, I expect one is not required, as the amount of heat generated is quite low. The circuit breaker is rated below the output rating of the transformer, so it would trip before the transformer managed to overheat. If the primary shorted, the main breaker would trip. I think I'm covered. The bridge rectifier is rated for 35 amps, and is mounted on a heat sink. Considering it sees only about 3½ amps, I expect it won't create much heat, nor will the transformer, which is being called upon to produce only half its rated output. All in all, I'm quite pleased with the results.

The two supplies provided by hammermill have all kinds of safety devices built in, as they were made to be used in commercial low voltage lighting. If they were just as quiet as the one I built! :-)

Harold
Wise people talk because they have something to say. Fools talk because they have to say something.
Post Reply