[sdiy] MS-20 psu conversion from 100V to 240V

[Tom Wiltshire]

Just to say that you should definitely go for it. I converted a 120V Polysix to 240V without trouble. It's just a question of working out what the right transformer is and then fitting it. Be careful, but definitely go for it.

Tom


On 17 May 2012, at 21:58, Oscar Salas wrote:

> 
>> Hi Andy,
>> 
>> I've converted a few 110V synths for 240V but I can't remember if the
>> MS20 was one of them.
>> 
>> From the circuit it looks like you could just replace the transformer
>> if you can find a suitable one, and fit it in there. If your closest
>> choice is 18V or 15V secondaries I'd go with the 15V one, as the
>> unregulated DC is marked as 18V on the schematic. The power dissipation
>> across the regulator may be too high if you use 18V secondaries.
>> 
>> Something like this would be suitable:
>> http://www.altronics.com.au/index.asp?area=item&id=M5015
>> 
>> 
>> If dropout voltage is a problem you could then replace the regulators
>> with low dropout types such as the LM2940-15.
>> 
>> Regards,
>> Stewart.
> 
> 
> Yes you are right, power dissipation must be considered.
> 
> 
> 
>> On 5/18/2012 12:44 AM, Andrew Simper wrote:
>>> I want to buy an MS-20 rev2, but the only ones I can find all have
>>> Japanese 100V power supplies. I have a friends 240V MS20 rev2 here and
>>> there is a transformer and fuse mounted on the chassie and then a
>>> tripple core wire from the transformer that is soldered directly onto
>>> the main PCB. Does anyone know if it is simply a matter of changing
>>> that transformer?
>>> 
>>> I'm assuming that the rev2 has the same power supply as the rev1:
>>> http://www.korganalogue.net/korgms/images/service/ms20/circ1.gif
>>> 
>>> Cheers,
>>> 
>>> Andy
>>> --
>>> cytomic - sound music software
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>>> http://dropmix.xs4all.nl/mailman/listinfo/synth-diy
>>> 
>> 
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