<html><head><meta http-equiv="Content-Type" content="text/html; charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;" class="">Oh, ok, sorry. I was misled by “Eurorack compatible” then. Only the output, I take it.<div class=""><br class=""></div><div class="">Tom</div><div class=""><br class=""><div class="">
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<div><br class=""><blockquote type="cite" class=""><div class="">On 16 Sep 2020, at 13:00, Quincas Moreira <<a href="mailto:quincas@gmail.com" class="">quincas@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class="">Tom, if I understand correctly, this will be a standalone device which probably doesn't already have bipolar 12v rails.</div><br class=""><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Sep 16, 2020 at 6:01 AM Tom Wiltshire <<a href="mailto:tom@electricdruid.net" class="">tom@electricdruid.net</a>> wrote:<br class=""></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">Why not just use an op-amp on the +/-12V rails to increase the output from the DAC from 3.3V or 5V or whatever you have? It’s only a little bit of gain you need. Of course, the steps between DAC values increase too, but that’s just a question of having enough resolution, which you’d need to do anyway, even with a higher voltage DAC.<br class="">
<br class="">
Messing around with power supplies is overcomplicating it, it seems to me.<br class="">
<br class="">
Tom<br class="">
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> On 16 Sep 2020, at 10:29, Spiros Makris <<a href="mailto:spirosmakris92@gmail.com" target="_blank" class="">spirosmakris92@gmail.com</a>> wrote:<br class="">
> <br class="">
> Hello list,<br class="">
> I am working on a (predominantly) midi project, based around the Teensy platform, and I'm trying to figure out the best way of adding a CV output, compatible (and useful) with eurorack.<br class="">
> Without any additions, I can use any off the shelf DAC to get 4 or 5 octaves of 1V/oct, but I would be interested in supporting the whole MIDI range (~10 octaves) - which means I need some switching converters, perhaps even a voltage inverter.<br class="">
> The options I can think of are:<br class="">
> 1. Don't do anything, have 5 octaves of range.<br class="">
> 2. Use a boost converter to get a 12V rail, then have 0-10V range<br class="">
> 3. Use both a boost and inverting converter, to get a pair of dual voltage rails (-12/+12 or similar?), and use a (-3,8V) range.<br class="">
> <br class="">
> I know the basic concepts of switching converters, but have never used one myself. I assume I need less than 100mA of current (to supply 4 opamps and a DAC), what parts would you recommend? <br class="">
> <br class="">
> Regards,<br class="">
> Spiros<br class="">
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</blockquote></div><br clear="all" class=""><div class=""><br class=""></div>-- <br class=""><div dir="ltr" class="gmail_signature"><div dir="ltr" class=""><div class=""><div dir="ltr" class=""><table width="500" cellspacing="0" cellpadding="0" border="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(97,97,97);font-family:Lato,sans-serif;font-size:13px" class=""><tbody class=""><tr class=""><td class=""><table cellspacing="0" cellpadding="0" border="0" style="border-spacing:0px;border-collapse:collapse" class=""><tbody class=""><tr class=""><td valign="top" width="100" style="padding:0px 8px 0px 0px;vertical-align:top" class=""><img alt="QMA" width="100" src="https://img.mysignature.io/p/d/b/2/db2c62d7-5170-5fef-927b-d8a4167b4321.png?time=1561593407" style="width: 100px; border-radius: 10%;" class=""></td><td valign="top" style="font-size:1em;padding:0px 15px 0px 8px;vertical-align:top" class=""><table cellspacing="0" cellpadding="0" border="0" style="border-spacing:0px;border-collapse:collapse;line-height:1.4;font-family:Georgia,serif;font-size:12.09px;color:rgb(0,0,1)" class=""><tbody class=""><tr class=""><td class=""><div style="font-stretch:normal;font-size:1.2em;line-height:normal;font-family:Georgia,serif" class="">Quincas Moreira</div></td></tr><tr class=""><td style="padding:4px 0px" class=""><div style="font-family:Georgia,serif" class="">Director | QMA</div></td></tr><tr class=""><td class=""><span style="font-family:Georgia,serif;color:rgb(100,100,100)" class="">mobile: </span> <span class=""><a href="tel:5534988825" style="color:rgb(0,0,1);font-family:Georgia,serif" target="_blank" class="">5534988825</a></span></td></tr><tr class=""><td class=""><span style="font-family:Georgia,serif;color:rgb(100,100,100)" class="">site: </span> <span style="font-family:Georgia,serif" class=""><a href="http://quincasmoreira.com/" style="color:rgb(0,0,1)" target="_blank" class="">quincasmoreira.com</a></span></td></tr><tr class=""><td class=""><span style="font-family:Georgia,serif;color:rgb(100,100,100)" class="">email: </span> <span class=""><a href="mailto:quincas@gmail.com" style="color:rgb(0,0,1);font-family:Georgia,serif" target="_blank" class="">quincas@gmail.com</a></span></td></tr></tbody></table></td></tr></tbody></table></td></tr></tbody></table><table cellspacing="0" cellpadding="0" border="0" style="border-spacing:0px;border-collapse:collapse;color:rgb(97,97,97);font-family:Lato,sans-serif;font-size:13px" class=""><tbody class=""><tr class=""><td style="display:block;padding:15px 0px 0px" class=""></td></tr><tr class=""><td style="border-top:1px solid rgb(238,238,238);padding-top:5px;font-size:10px;font-family:Arial" class=""><br class=""></td></tr></tbody></table></div></div></div></div>
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