<html><head><meta http-equiv="Content-Type" content="text/html charset=us-ascii"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; ">Thanks, I have a look for the stuff about the 303 supply.<div><br></div><div>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.</div><div><br></div><div><br><div><div>On 27 Aug 2016, at 07:44, Nathan Trites <<a href="mailto:nathan@idmclassics.net">nathan@idmclassics.net</a>> wrote:</div><br class="Apple-interchange-newline"><blockquote type="cite"><div dir="ltr">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. <div><br></div><div>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!</div><div><br></div><div>Best,</div><div><br></div><div>Nathan</div></div><div class="gmail_extra"><br><div class="gmail_quote">On Fri, Aug 26, 2016 at 4:30 PM, Tom Wiltshire <span dir="ltr"><<a href="mailto:tom@electricdruid.net" target="_blank">tom@electricdruid.net</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span class=""><br>
On 26 Aug 2016, at 19:55, Richie Burnett <<a href="mailto:rburnett@richieburnett.co.uk">rburnett@richieburnett.co.uk</a>> wrote:<br>
<br>
>> 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?....<br>
><br>
> Flyback converter consisting of TR1, TR2, T1, (left side of main circuit diagram,) marked POWER SUPPLY ;-))<br>
><br>
> -Richie,<br>
<br>
</span>Thanks Richie. "Flyback converter" is the part I didn't recognise then. I'll look 'em up!<br>
<div class="HOEnZb"><div class="h5"><br>
Tom<br>
<br>
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