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Old 19th September 2005, 06:22 AM   #1
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Just another one LM3886
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Old 19th September 2005, 06:39 AM   #2
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very neat front panel
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Old 19th September 2005, 11:07 PM   #3
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Old 20th September 2005, 02:02 AM   #4
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What's with the extra wires on the transformer?

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Old 20th September 2005, 02:05 AM   #5
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Default LED maybe

That is a simple trick to get a low voltage, low power tap. Just wrap enough to get whatever voltage you need.

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Old 20th September 2005, 02:12 AM   #6
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accomplished building,Russia diyer.you have impressed me

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Old 20th September 2005, 02:26 AM   #7
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Thanks, I had thought it might be a low-voltage tap, but couldn't see another bridge rectifier on there anywhere.

Any idea how the four wires are wired up? in series to make one really long wire, then the "ends" of the really long wire give us AC?

I had actually considered doing something like this to get ~8VAC 0.3A in the amp I'm building.. any idea how to figure out if this is possible on my toroid? (specifically -- how do I figure out current capacity? Overload and look for sag?) I was actually getting ready to just use a 9V battery.

Wes
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Old 20th September 2005, 02:39 AM   #8
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Quote:
Originally posted by wes-ninja250
Thanks, I had thought it might be a low-voltage tap, but couldn't see another bridge rectifier on there anywhere.

Any idea how the four wires are wired up? in series to make one really long wire, then the "ends" of the really long wire give us AC?

I had actually considered doing something like this to get ~8VAC 0.3A in the amp I'm building.. any idea how to figure out if this is possible on my toroid? (specifically -- how do I figure out current capacity? Overload and look for sag?) I was actually getting ready to just use a 9V battery.

Wes


This may not be a LED supply. Normally that only requires 3 - 4 wraps. Maybe it powers a higher voltage LED, most here are 3.5 volts. And guess that depends on the transformer too.
300 ma sounds a little tough, most I have seen are 10 - 20 ma circuits. The coupling on top of the normal windings is not so good, the amount of current will be limited.

George


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Old 20th September 2005, 10:13 AM   #9
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Default Re: LED maybe

Quote:
Originally posted by Panelhead
That is a simple trick to get a low voltage, low power tap. Just wrap enough to get whatever voltage you need.

George
Beforehand I am sorry for the English.

You are completely right, I had to make such winding to receive 12V for a feed(meal) of low-voltage circuits. Any other variants simply were not located in the case.
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