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Old 10th February 2003, 09:55 AM   #21
miguel2 is offline miguel2  Portugal
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If I disconnect the transformer from everything (it stays just by itself, no load) and turn the mains on it buzzes. I am positive that it is the transformer. I have an EI 300VA but I have not tested it yet.
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Old 10th February 2003, 10:01 AM   #22
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That was not so good
I would replace it strait away, I ones had a transformer that gave up!( It was very old) that ended in small fire in my room!!
Luckily nothing was harmed, except my pride!!
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Old 10th February 2003, 10:13 AM   #23
miguel2 is offline miguel2  Portugal
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Wow, I hope this one does not self destruct into a bunch of flames . Maybe I bake it under vacuum before I throw it away. Afterall it gave me some trouble adjusting the secondary voltages from it - I had to unwind a couple of turns from the secondary and then put all that plastic tape back in a nice manner.
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Old 10th February 2003, 10:17 AM   #24
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It could be the problem that the plastic or the core on the trafo, not is tight enough
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Old 10th February 2003, 01:26 PM   #25
Stabist is offline Stabist  Slovenia
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Hi!

Me again - now I'm fresh-minded ...

Hmm - about those capacitors on AC side - I guess they are polarized ones - so - how to use them - a have in mind that when 2 polarized are connected witj same polarity - than they represent non-polarized one ... Am I right or wrong??
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Old 10th February 2003, 01:28 PM   #26
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Quote:
...back to back...
they will emulate a non-polarized one
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Old 10th February 2003, 01:45 PM   #27
Stabist is offline Stabist  Slovenia
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Well - I assumed that "back to back" means something - but I disn't know the meaning ...
So - "back to back" - that means (+) to (+) or (-) to (-) - both ways we get non-polarised one ... Right?

Thanks again!
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Old 10th February 2003, 01:48 PM   #28
miguel2 is offline miguel2  Portugal
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I used a regular polarized electrolyitc, like it is said in another thread about DC traps. I have to say that I covered the whole thing but there was no (big-) bang at all and everything is fine thank you.

The cap did not warmed up even.
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Old 10th February 2003, 03:33 PM   #29
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Stabist, yes.
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Old 10th February 2003, 05:28 PM   #30
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Sometimes the DC is great enough to get past 2
diodes

Try it without diodes.

Just as likely you have a noisy transformer: it does happen.
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