[sdiy] Modding Matrix 6R PSU?

[Tom Wiltshire]

Chuckle chuckle...me too. I keep telling the men in white coats that  
I wasn't permanently affected...

I do feel a bit like this cat's used up seven or eight lives already  
though. Going to take it pretty easy from here on in and not take too  
many chances.

Good luck getting it going,
Tom


On 23 Sep 2009, at 21:38, cheater cheater wrote:

> Don't worry, I got shocked by 220V thrice on different occasions as a
> small kid. One more won't do anything the previous ones couldn't.
>
> D.
>
> On Wed, Sep 23, 2009 at 4:49 PM, Tom Wiltshire  
> <tom at electricdruid.net> wrote:
>> I did something similar to a US Korg Polysix once upon time.
>>
>> Here's how I'd go about it:
>>
>> 1) Disconnect the transformer secondary wires from the rest of the  
>> power
>> supply so you don't blow anything up.
>> 2) Test it as it stands now so that you know how much AC the AC/DC
>> conversion part of the power supply is expecting. You need a 240/120V
>> adaptor for this. Beg/borrow or steal one from a building site.
>> 3) Have a cup of coffee so you brain is awake enough to deal with  
>> mains
>> electricity and/or stand on a rubber bathmat ;)
>> 4) Disconnect everything
>> 5) Have a look at the primary side of the transformer. Usually  
>> this consists
>> of a pair of windings of which one is used for 120V and both are  
>> used (in
>> series) for 240V. Sometimes there'll be four wires, two each for  
>> the two
>> windings, and sometimes there are only three, with one common to both
>> windings.
>> 6) Solder it up with both primary windings in series
>> 7) Reconnect and test the secondary output. With a bit of luck,  
>> the lights
>> in your house are still on, and the secondary voltage is the same  
>> as it was
>> in step 2.
>> 8) If it is, wire it all back up and bingo!
>>
>> Fur gawd's sake, be careful.
>>
>> T.
>>
>> On 23 Sep 2009, at 09:23, cheater cheater wrote:
>>
>>> Hi guys,
>>> I have recently bought a Matrix6R. It's a 120V version, supposedly.
>>> However, it turns out that the transformer inside it is rated as:
>>>
>>> 100V/230V
>>> 41V    30VA
>>>
>>> ..which looks promising I guess?
>>>
>>> The whole marking on it is:
>>> BANDO EP-55
>>> (307-01257)
>>> BE2-GJM
>>>
>>> 61-12663
>>> 100V/230V
>>> 41V 30VA
>>> and then a line of Japanese :)
>>>
>>> soooo.... anyone got a clue what I'd do to make this thing eat 230V?
>>>
>>> Thanks
>>> D.
>>> _______________________________________________
>>> Synth-diy mailing list
>>> Synth-diy at dropmix.xs4all.nl
>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>>
>>
>>
>>
>
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