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Old 24th October 2002, 07:46 PM   #1
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Default Transfomer Trouble, don't dare plugging it in

I juste took an xformer (not toroid) out of an older amplifier, and I have used it in test setups. But there was a switch there for setting the mode between 110-220 Volts input voltage.
Now, I have taken it away and cut the wires abit, but I measured in advance that I didn't change anything.

So, now I'm a little frightened plugging it in again, so I guess my question is; What's the worst that could happen?? if it's now set for 110V anyway.

any experients with these kinds of multiple winding transformers will probably help, I'd be glad to post a pic.
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Old 24th October 2002, 08:34 PM   #2
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See this thread, maybe you can use the info.

Color codes on transformer
/Per-Anders (my first name) or P-A as my friends call me
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Old 25th October 2002, 12:53 AM   #3
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Worst case scenario : transformer smokes and shorts itself.

Just for future reference:
Before changing anything make a little drawing with what goes where etc.

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Old 25th October 2002, 01:26 AM   #4
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install fuses before turn on the amp
i install my trans wrong before.
230 v for 120v connection
the fuse blew then i new what i did wrong
fuse 5a slow blow. Normally trans can withstand over current for some number of time
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Old 26th October 2002, 12:42 PM   #5
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There are a bunch of threads here about identifying transformer leads- do a search.

When I am going to work on a piece of equipment I use my digital camera to take many photos from multiple angles before I start taking things apart. That way when it is time to reassemble I have a clear, colorful reference as to what was what back when I started. This is especially useful if you get interrupted in the middle of what you're doing and can't get back to it for days, weeks, or even months.

It also helps to make sketches showing where different sized screws go...

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Old 26th October 2002, 02:57 PM   #6
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I've now Fired It Up! It still works. Didn't use fuses, couldn't find any at the time and my fingers were twitching, so....

But I kept a good distance and watched the output voltage.
I guess my initial fears where that it would blow up. But I'm still here, and it works nicely.

Next up will be the mechanical isolation, it makes quite some noise when I put it on a table. So i glued several layers of rubber feet under it, and know it's almost completely silent.

thanks for the help alll of you!
and by the way - Fred Dieckmann - I'm also a Swede :-)

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