Electronics > Beginners
Linear Power Supply, buzzing. Defective? Repairable?
paulca:
Have you tried hitting it? Generally when things buzz a good WHACK stops it.
The same applied for whining, but you'll end up divorced.
dnwheeler:
If you're having trouble locating the source, hold a small dowel or plastic rod against your ear (against the bone, not IN your ear), then touch the other end against each component to see which one is vibrating the loudest.
RoGeorge:
--- Quote from: dnwheeler on January 16, 2020, 09:49:24 pm ---If you're having trouble locating the source, hold a small dowel or plastic rod against your ear (against the bone, not IN your ear), then touch the other end against each component to see which one is vibrating the loudest.
--- End quote ---
That's a neat trick, thank you! :D
andy3055:
--- Quote from: dnwheeler on January 16, 2020, 09:49:24 pm ---If you're having trouble locating the source, hold a small dowel or plastic rod against your ear (against the bone, not IN your ear), then touch the other end against each component to see which one is vibrating the loudest.
--- End quote ---
This is very true. This is the common method used to find if a bearing is bad on a motor. I can say that the number of times I may have done this is so many. You can easily hear the scraping noise inside a bearing!
If the transformer is making the noise, mark the wires and remove it from the chassis and take it to a place where they do motor winding and ask them to varnish and bake it. It should be a very cheap thing to do. If you know a place where you could get insulating varnish, you could do it at home. Just don't put it in an oven! Once you have it out, put it in a metal container and hang a high wattage bulb besides it so that it gets real hot. Then, remove the bulb and pour in the varnish and hang the bulb again and let it get real hot. There is no damage to the winding at all. Leave it till the varnish is dry. Let it cool down and re-install.
Jwillis:
I have an old battery charger that started making noise like that. Don't leave your battery charger in the rain. Anyway .all I did brush off the rust and sprayed a good heavy coat of paint all over the transformer. Good as new . I'll get another 20 years out of it. It doesn't take much gap in a lamination to make a lot of noise . Just a good couple coats of thinned varnish and one coat of straight varnish will probably do the trick.
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