<html><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;"><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">This page. </span><div><img width="555" alt="PastedGraphic-1.png" src="cid:388F09D0-26BA-4729-BB64-1E6C6ECC3B02"><div><br></div><div><br></div><div><span style="caret-color: rgb(0, 0, 0); color: rgb(0, 0, 0);">And it's this section of the circuit: </span></div><div><img width="640" alt="PastedGraphic-2.png" src="cid:189C1E09-B672-4CF6-B1EB-A9C02C7A003C"></div><div><br></div><div>Half of U150 + U157 make up a little VCO (our LFO. 1 of 2, this is the upper LFO).</div><div>The other half of U150 + U149 + U148 make up a sample and hold. </div><div>That middle 4053 section selects between noise and the LFO triangle output, the 4053 further right selects between that result and the LFO square output. That final 4053 selects between all this (the upper LFO) or the lower LFO, which I assume is for when you aren't splitting the keyboard and all voices are on the same preset, thus using the same LFO. </div><div><br></div><div>Chris McDowell </div><div><div><br><blockquote type="cite"><div>On Nov 16, 2024, at 9:59 PM, ColinMuirDorward <colindorward@gmail.com> wrote:</div><br class="Apple-interchange-newline"><div><div><div dir="auto">Thank Chris, can you point to which page has the LFO?</div></div><div dir="auto">Regards,</div><div dir="auto">Colin</div><div><div dir="auto"><br clear="all"><br clear="all"><div><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><a href="https://thecreativeinitiativeswarehouse.cargo.site/" target="_blank">https://thecreativeinitiativeswarehouse.cargo.site/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">https://www.instagram.com/colinmuirdorward/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank"><font color="#888888"></font></a><font color="#888888"><a href="https://www.instagram.com/thefollower__________________" target="_blank">https://www.instagram.com/thefollower__________________/</a></font></div></div></div></div></div></div></div></div></div><div><br></div><div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Sat, Nov 16, 2024 at 8:27 PM Chris McDowell <<a href="mailto:declareupdate@gmail.com" target="_blank">declareupdate@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><div dir="auto">In the schematic I see two analog LFOs and no LFOs on the voice card. So, not digital, and not per-voice. <div><br></div><div>It is a "single" global LFO, but there are two so that the upper and lower programs each have their own. <div><br id="m_-8118578450100636498m_8033759464176270228lineBreakAtBeginningOfSignature"><div dir="ltr">Cheers,<div>Chris </div></div><div dir="ltr"><br><blockquote type="cite">On Nov 16, 2024, at 7:34 PM, ColinMuirDorward via Synth-diy <<a href="mailto:synth-diy@synth-diy.org" target="_blank">synth-diy@synth-diy.org</a>> wrote:<br><br></blockquote></div><blockquote type="cite"><div dir="ltr"></div></blockquote></div></div></div><div dir="auto"><div><div><blockquote type="cite"><div dir="ltr"><div dir="ltr"><div>Hi, wondering if anyone can chime in about the OBXa architecture.</div><div>I'm wondering about the LFO, and how it is generated. Digitally?</div><div>Also wondering if there is just a single/global LFO, or if it's provided per voice.</div><div>I tried asking the interwebs... but there is just so much noise out there.</div><div>I also tried looking at schematics, but that was a bit beyond me.</div><div>Kind regards,</div><div>Colin<br clear="all"></div><br><span class="gmail_signature_prefix">-- </span><br><div dir="ltr" class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><a href="https://thecreativeinitiativeswarehouse.cargo.site/" target="_blank">https://thecreativeinitiativeswarehouse.cargo.site/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank">https://www.instagram.com/colinmuirdorward/</a></div><div><a href="https://www.instagram.com/colinmuirdorward/" target="_blank"><font color="#888888"></font></a><font color="#888888"><a href="https://www.instagram.com/thefollower__________________" target="_blank">https://www.instagram.com/thefollower__________________/</a></font></div></div></div></div></div></div></div></div>
</div></blockquote></div></div></div><div dir="auto"><div><div><blockquote type="cite"><div dir="ltr"><span>________________________________________________________</span><br><span>This is the Synth-diy mailing list</span><br><span>Submit email to: <a href="mailto:Synth-diy@synth-diy.org" target="_blank">Synth-diy@synth-diy.org</a></span><br><span>View archive at: <a href="https://synth-diy.org/pipermail/synth-diy/" target="_blank">https://synth-diy.org/pipermail/synth-diy/</a></span><br><span>Check your settings at: <a href="https://synth-diy.org/mailman/listinfo/synth-diy" target="_blank">https://synth-diy.org/mailman/listinfo/synth-diy</a></span><br><span>Selling or trading? Use <a href="mailto:marketplace@synth-diy.org" target="_blank">marketplace@synth-diy.org</a></span><br></div></blockquote></div></div></div></blockquote></div></div>
</div>
</div></blockquote></div><br></div></div></body></html>