Rommudoh<p>This time my <a href="https://social.tchncs.de/tags/soldering" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>soldering</span></a> was a fail. This is supposed to be a <a href="https://social.tchncs.de/tags/keyboard" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>keyboard</span></a> controller for playing my <a href="https://social.tchncs.de/tags/StackSynth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>StackSynth</span></a> but the sample and hold part needs rework. The output voltage keeps rising. At first I noticed that I used a ceramic <a href="https://social.tchncs.de/tags/capacitor" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>capacitor</span></a> where I should've used a polymer one, but this bodge didn't help. Maybe the <a href="https://social.tchncs.de/tags/TL074" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>TL074</span></a> are out of spec (most likely fake ones but worked fine in the other modules) or the FETs are bad...<br>The keys will be attached using a stereo 3.5mm audio jack, and will be extendable like my perfboard version.<br><a href="https://social.tchncs.de/tags/diysynth" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>diysynth</span></a> <a href="https://social.tchncs.de/tags/synthesizer" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>synthesizer</span></a> <a href="https://social.tchncs.de/tags/sampleandhold" class="mention hashtag" rel="nofollow noopener" target="_blank">#<span>sampleandhold</span></a></p>