<html aria-label="message body"><head><meta http-equiv="content-type" content="text/html; charset=utf-8"></head><body style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;">On Dec 13, 2025, at 12:06 PM, Scott Bernardi via Synth-diy <synth-diy@synth-diy.org> wrote:<br><div><blockquote type="cite"><br class="Apple-interchange-newline"><div><div dir="ltr">I built a tri core vco and used a typical method to convert the triangle to a saw using the invert - noninvert of the triangle and adding the square back in. Schematic and the waveforms I get are on this page:<div><a href="https://www.bernacomp.com/elec/og2/weird-saw.html">Weird Saw</a></div><div><br></div><div>Any ideas what's going on and how to correct it?</div></div></div></blockquote><br></div><div>The 2N7000 has a parasitic diode between the drain and the source, so it will start conducting if the drain goes more than 0.6V negative.<br id="lineBreakAtBeginningOfMessage"><div><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div dir="auto" style="overflow-wrap: break-word; -webkit-nbsp-mode: space; line-break: after-white-space;"><div><br> -- Don<br>--<br>Donald Tillman, Palo Alto, California<br>https://till.com</div></div></div></div></div></body></html>