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Old 25th February 2009, 11:29 AM   #1
diyAudio Member
Join Date: Feb 2009
Default US to Euro Power Conversion for my Yamaha Keyboard

New to the forum, so please let me know if I should post this elsewhere.

I recently moved to Berlin from the US and have a question about converting my Yamaha P-90 Electronic Piano:
DC12V with external AC Power Adapter
Input AC120V 60Hz 12.5W
Output DC12V 700mA

to European wall power:
220V 50Hz

I purchased this AC/AC step down converter plug,
Input 230V~50Hz
Output AC110V 45W

And replaced my old AC adapter with a universal Power Adapter:
100-240V ~50/60Hz
Output DC12V Max 1000mA

I am not well versed in electronics, and did this mostly on guesswork, but it seems to work...

But I've heard horror stories about people frying their equipment, and this is a costly keyboard I would not be able to replace.

Does anyone out there think my conversion method sounds like it should work, or does anything jump out as being a really bad idea?

Any assistance on this matter would be greatly appreciated!
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Old 25th February 2009, 04:02 PM   #2
Pano is offline Pano  United States
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Location: Milliways
Blog Entries: 4
The new AC adapter should be the ticket. It's rated for the same output voltage and even more current than the original. (Your keyboard will only draw as much current as it needs).

Did you check polarity on the DC plug - that's important!
Usually it's center positive. Check the original to be sure.

So as long as you don't have any strange buzz or hiss from the new power supply - no worries.
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Old 25th February 2009, 06:16 PM   #3
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Join Date: Feb 2009
Thanks so much for taking a look at this... and yes, I checked the polarity on the DC connector (center positive).

Now I can get to work without worrying too much, thanks!
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Old 25th February 2009, 07:10 PM   #4
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Join Date: Sep 2006
Location: Wirral UK

These are worth knowing about also.

Enjoy Berlin, I haven't been for nearly 20 years but have had some tremendous nights there (I think)

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Old 26th February 2009, 12:01 AM   #5
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Originally posted by john blackburn
These are worth knowing about also.


These don't upconvert the line frequency to 60Hz. Running a USA class-2 wallwart on 50Hz is asking for a fire

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Old 26th February 2009, 12:46 AM   #6
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Join Date: Sep 2006
Location: Wirral UK

Sorry I was unaware of that, thanks for the clarification.

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