[sdiy] Roland SH-101 power supply

[Tom Wiltshire]

Thanks, I have a look for the stuff about the 303 supply.

No, I don't have to repair one. I was asking because I've been looking at CEM3340 VCO designs, and the SH-101 uses one. When I first had a look at it, I couldn't work out for the life of me what voltages it was attached to, since all there was was a whole selection of different coloured triangles and arrows. Not entirely clear. Some digging in the rest of the schematic decoded them, but then that made me wonder about the PSU.


On 27 Aug 2016, at 07:44, Nathan Trites <nathan at idmclassics.net> wrote:

> Check out the Tr-606, Tb-303, and MC-202 for similar PSU setups. IIRC Guest may have written a good breakdown of the 303's supply either on muffs or the Open Music Labs site. 
> 
> Hoping you're just looking out of curiosity and don't have to repair one! Bad transformers can make it a pain diagnosing problems since there's so few points where you can isolate the power supply from other sections. If you are repairing a 101 and end up needing the transformer or other parts, let me know and I can get you sorted!
> 
> Best,
> 
> Nathan
> 
> On Fri, Aug 26, 2016 at 4:30 PM, Tom Wiltshire <tom at electricdruid.net> wrote:
> 
> On 26 Aug 2016, at 19:55, Richie Burnett <rburnett at richieburnett.co.uk> wrote:
> 
> >> What I'd like to know is how do they get such a range of voltages (-5V to +15V is a 20V range) from a 9V supply?....
> >
> > Flyback converter consisting of TR1, TR2, T1, (left side of main circuit diagram,) marked POWER SUPPLY  ;-))
> >
> > -Richie,
> 
> Thanks Richie. "Flyback converter" is the part I didn't recognise then. I'll look 'em up!
> 
> Tom
> 
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