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

[Andre Majorel]

On 2012-05-18 06:48 +1000, Stewart Pye wrote:

> 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.

On mine, the secondaries measure at 19.2 V loaded and 20.5 V
unloaded. Actually 20.1 and 21.4 V but it's a 220 V model and
mains voltage in France is now 230 V.

An MS-20 can power a few external modules (mine does) and remain
cool so the transformer must be generously sized. I bet you
would see 18 volts at rated load.

-- 
André Majorel http://www.teaser.fr/~amajorel/