<div dir="ltr">I have an opinion, I will let the more experienced shoot me down if I'm wrong (and will learn from the experience!)<div><br></div><div>I've seen CMOS sequencing circuits where you needed pull ups or pull downs *at the chip* to make them behave well. You'll note that you do have the pull up on the clock directly connected to the chip. Since the reset is active high, I would put another pull up resistor on the other side of that inverter, or possibly simply use another transistor stage wired in the same way as an inverter, to drive the reset pins. (in other words, instead of a chip inverter, another transistor with the signal from the previous collector going to the new one's base, same pull up, same ground on the emitter, and connect the collector/resistor junction to the reset pins).</div><div><br></div><div>I'd say it's at least worth a test....</div><div><br></div><div>Pete</div><div><br></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Fri, Jun 21, 2024 at 5:43 PM Didrik Madheden via Synth-diy <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="auto"><div>What are you using for the inverter? What value for the capacitor? Is the first and second input pulse identical? </div><div dir="auto"><br></div><div dir="auto">Have you worked your way backward and seen how far your pulse goes before disappearing, if it does? Do you have a pulse before/after the inverter?</div><div dir="auto"><br></div><div dir="auto">/Didrik<br><br><div class="gmail_quote" dir="auto"><div dir="ltr" class="gmail_attr">On Sat, 22 Jun 2024, 00:06 denshi via Synth-diy, <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div><div style="font-family:"Helvetica Neue",Helvetica,Arial,sans-serif;font-size:13px">im trying to add a reset to a CD4520 but running into an issue:<br><br>in the TKB serge uses a CD4520 to handle the vertical clock (cycling between four vertical rows of pots)<br>here is a relevant snippet of the schematic (as found on hyperreal)<br><div>i copy and pasted the clock input to use as the “vertical reset” and am sending that to an inverter to the bottom half reset - it works, but only once, and then not again until i power cycle. am i missing something simple here?</div><div><br></div><div dir="ltr"><img title="Inline image" alt="Inline image" src="cid:ii_1903cf05e47c6ee0b241" style="max-width: 800px; width: 100%;"><br><span></span><br></div></div></div>________________________________________________________<br>
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