<div dir="ltr"><div dir="ltr">On Sun, 11 Aug 2024 at 22:15, David G Dixon via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><u></u>
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<div dir="ltr" align="left"><span>I'm actually building my
own version of the Korg PS-3100. I'm calling it the Sketchy Labs
DS-3100.</span></div></div></blockquote><div><br></div><div>Hoo-haa!</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div dir="ltr" align="left">... <br></div>
<div dir="ltr" align="left"><span>Each ADSR requires one
2164</span></div></div></blockquote><div><br></div><div>Wouldn't one VCA per envelope generator be enough? Depends on the design, of course.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div dir="ltr" align="left">... <br></div>
<div dir="ltr" align="left"><span>My worries with this
beast are: 1) How much heat will the circuitry generate?</span></div></div></blockquote><div><br></div><div>The majority of the power in a synth circuit is often burnt in the ICs just by having them powered up, so try to estimate the number of them and their supply voltage. Perhaps you use a lot of transistors instead, and perhaps you use TL064 or other low-power op-amps - then things might be a bit different and the above estimations less realistic.</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div dir="ltr" align="left"><span> I'm going to
install a fan inside the case, but I don't know whether it will be sufficient,
particularly since many circuit boards will be stacked about 1 cm apart.</span></div></div></blockquote><div><br></div><div>Stack them vertically and also let air pass through the casing, and it will be fine and cosy. :-)</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;"><div dir="ltr" align="left"><span>3) Will there be a problem
mixing 48 key outputs together? Will clipping be a problem?
Obviously, all 48 keys will never be played at the same time, but
still.</span></div></div></blockquote><div><br></div><div>Gainstaging a synth with lots of voices is a nontrivial problem. But at least it's just one gain factor that needs to be decided upon..</div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div style="overflow-wrap: break-word;">
<div dir="ltr" align="left"><span></span>This is a project that I
have dreamed of doing ever since I started doing synth DIY. I know it's
stupid and ill advised, but it has been a lot of fun so far, and that's really
the whole point. It's going to take me months to build, and that's also
sort of the point. I've designed the VCOs and the voicecards, and built
prototypes that I'm happy with, so once my huge 2164 order arrives, I'll start
building. I still have to design the circuitry downsteam of the
voicecards, and figure out the front panel, but I'm not too worried about
that.</div></div></blockquote><div><br></div><div>Fun times! :-D</div><div><br></div><div>/mr</div></div></div>