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Old 1st December 2008, 03:05 PM   #1
maurycy is offline maurycy  United States
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Default Simple question regarding converting chipamp from 110V to 220V

I have a LM3875 based stereo chipamp that I have built based on BrianGT's kit. It is currently setup with a small 42 CVT trafo and works just fine. This is in US so it runs on 110V. Now, if I were to take this amp to Europe, would it work just by replacing 110V 42CVT trafo with 220V 42CVT one or I would need to make more changes to the components on the PCB?

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Old 1st December 2008, 03:15 PM   #2
rhysh is offline rhysh  United Kingdom
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All that is needed, is to change the transformer to a 220v one, and maybe the onboard fuse, if there is one, and if it is 110v rated.

Rhys
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Old 1st December 2008, 03:18 PM   #3
maurycy is offline maurycy  United States
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Thanks rhysh for your reply. I was thinking that changing trafo would be enough but since my knowledge about electronics is very limited, I wanted to be sure.
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Old 1st December 2008, 03:33 PM   #4
rhysh is offline rhysh  United Kingdom
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No worries What i have mentioned are the only things that will need doing, just check the AC switches, Fuseholder etc and make sure they are rated over 220v. Just a precaution.
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Old 1st December 2008, 03:40 PM   #5
AndrewT is offline AndrewT  Scotland
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Hi,
your transformer may already be suitable for both 110/120Vac and 220/240Vac.

Does it have a single 110/120Vac primary winding
or
a dual 110/120Vac winding wired in parallel?
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Old 1st December 2008, 04:17 PM   #6
maurycy is offline maurycy  United States
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I have no idea Andrew. I got it from ApexJr. Here is the description:

Chia Yu Co Ltd
Input: 2 X 120Vac 50-60Hz 3" Dia X 1 1/2" Tall
Output 42Vct 21V- 0 - 21V 80VA
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Old 1st December 2008, 04:19 PM   #7
rhysh is offline rhysh  United Kingdom
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Yes, you should just be able to wire the inputs in series.
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Old 2nd December 2008, 02:40 AM   #8
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Which means you don't need a new transformer, you just need to wire it differently.
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Old 2nd December 2008, 07:16 AM   #9
AndrewT is offline AndrewT  Scotland
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Quote:
Originally posted by rhysh
Yes, you CAN wire the inputs in series.

Quote:
Originally posted by Redshift187
Which means you don't need a new transformer, you just need to wire it differently.
a dual primary is effectively universal for use anywhere in the world with 110/120Vac or 220/240Vac.
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Old 2nd December 2008, 07:52 AM   #10
rhysh is offline rhysh  United Kingdom
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Quote:
Originally posted by AndrewT



a dual primary is effectively universal for use anywhere in the world with 110/120Vac or 220/240Vac.
Im aware, i just didnt want to get blamed for anything blowing up


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