<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div style="color:#000; background-color:#fff; font-family:verdana, helvetica, sans-serif;font-size:16px"><div id="yui_3_16_0_ym19_1_1505862289768_38119">Hi, all</div><div id="yui_3_16_0_ym19_1_1505862289768_38899" dir="ltr">While it doesn't do PWM, an English company named FlatKeys produces a Top Octave Generator replacement for the classic synths and organs which use a 50240 TOG. This one isn't just a divider; it generates 12 separate top octave waves which are in tune, unlike the originals' approximations.<br>It will also do vibrato, as it has a master clock. It can switch octaves if desired, or transpose keys. <br>The price is £52.80.<br>I haven't tried one out, but have been meaning to for a long time. If anyone else out there has, I'd love to hear about it - warts and all. Maybe it will work for you, or someone else out there.</div><div id="yui_3_16_0_ym19_1_1505862289768_38872" dir="ltr"><a class="enhancr2_25de5670-1564-a9fb-8d18-3b2c135ea869 edited-link-editor" id="yui_3_16_0_ym19_1_1505862289768_38871" href="http://www.flatkeys.co.uk/MK50240.html">FK50240 MK50240</a> </div><div id="yui_3_16_0_ym19_1_1505862289768_39147" dir="ltr">I am NOT affiliated with FlatKeys in any way, shape, form or manner. Just thought that this might be a good solution for replacing scarce top octave divider chips.</div><div id="yui_3_16_0_ym19_1_1505862289768_38898"><br></div><div class="yahoo-link-enhancr-card yahoo-link-enhancr-not-allow-cover ymail-preserve-class ymail-preserve-style" id="enhancr2_25de5670-1564-a9fb-8d18-3b2c135ea869" style="max-width:400px;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;" dir="ltr" contenteditable="false" data-type="yenhancr" data-url="http://www.flatkeys.co.uk/MK50240.html" data-size="medium" data-category="article" data-embed-url=""> <a class="yahoo-enhancr-cardlink" id="yui_3_16_0_ym19_1_1505862289768_38888" style="text-decoration:none !important; color: #000 !important" href="http://www.flatkeys.co.uk/MK50240.html" target="_blank" rel="noreferrer"> <table class="card-wrapper" id="yui_3_16_0_ym19_1_1505862289768_38887" style="max-width:400px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yui_3_16_0_ym19_1_1505862289768_38886"><tr id="yui_3_16_0_ym19_1_1505862289768_38885"> <td width="400" id="yui_3_16_0_ym19_1_1505862289768_38884"> <table width="100%" class="card-info" id="yui_3_16_0_ym19_1_1505862289768_38883" style="background:#fff;max-width:400px;border:1px solid #e0e4e9;border-bottom:3px solid #000000;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yui_3_16_0_ym19_1_1505862289768_38882"><tr id="yui_3_16_0_ym19_1_1505862289768_38881"> <td style="vertical-align:top;padding:16px 0 16px 12px;"> </td> <td id="yui_3_16_0_ym19_1_1505862289768_38880" style="vertical-align:middle;padding:16px 12px;width:99%;"> <h2 class="card-title" style="margin:0 0 4px 0;font-size:16px;font-family:'Helvetica Neue', Helvetica, Arial, sans-serif;word-break:break-word;">FK50240 MK50240</h2> <div class="card-description" style="font-size:11px;line-height:15px;color:#999;word-break:break-word;"></div> </td> <td class="card-share-container"></td> </tr> </tbody></table> </td> </tr> </tbody></table> </a></div><div id="yui_3_16_0_ym19_1_1505862289768_39151"><br></div> <div class="qtdSeparateBR"><br><br></div><div class="yahoo_quoted" style="display: block;"> <div style="font-family: verdana, helvetica, sans-serif; font-size: 16px;"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;"> <div dir="ltr"><font face="Arial" size="2"> On Tuesday, September 19, 2017 5:32 PM, Tom Wiltshire <tom@electricdruid.net> wrote:<br></font></div> <br><br> <div class="y_msg_container"><div dir="ltr">Because the standard TOG is based on dividers, you can’t add PWM. Run any width pulse wave through a flip-flop and the output's a square, after all.<br clear="none"><br clear="none">That said, there were some TOGs the produced 33% pulse waves rather than squares (not sure exactly what the internals were to do that) but there were none that offered PWM.<br clear="none"><br clear="none">If you had twelve ramp oscillators for the top-octave, you could arrange ramp+squares to give you ramps at various divided octaves, and then use those ramps to produce PWM, but it’d be a lot of circuitry, and it’d probably get a bit sensitive. Have a search for “sub-octave ramp wave” to get the basic idea.<br clear="none"><br clear="none">HTH,<br clear="none">Tom<br clear="none"><br clear="none">==================<br clear="none"> Electric Druid<br clear="none">Synth & Stompbox DIY<br clear="none">==================<br clear="none"><br clear="none">> On 20 Sep 2017, at 00:06, Mike HEQX <<a href="mailto:mike@heqx.com" shape="rect" ymailto="mailto:mike@heqx.com">mike@heqx.com</a>> wrote:<br clear="none">> <br clear="none">> I wanted to do something with a TOG and I was hoping I could add PWM to it. Not sure if you can PWM the master clock though, but that's what I want to try. After all you pitch bend it that way.<br clear="none">> <br clear="none">> I not does that mean 12 pwm on the output of the tog?<br clear="none">> <br clear="none">> <br clear="none">> thoughts?<br clear="none">> <br clear="none">> <br clear="none">> Mike<br clear="none">> <br clear="none">> _______________________________________________<br clear="none">> Synth-diy mailing list<br clear="none">> <a href="mailto:Synth-diy@synth-diy.org" shape="rect" ymailto="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none">> <a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank" shape="rect">http://synth-diy.org/mailman/listinfo/synth-diy</a><div class="yqt8406813847" id="yqtfd10797"><br clear="none"><br clear="none"><br clear="none">_______________________________________________<br clear="none">Synth-diy mailing list<br clear="none"><a href="mailto:Synth-diy@synth-diy.org" shape="rect" ymailto="mailto:Synth-diy@synth-diy.org">Synth-diy@synth-diy.org</a><br clear="none"><a href="http://synth-diy.org/mailman/listinfo/synth-diy" target="_blank" shape="rect">http://synth-diy.org/mailman/listinfo/synth-diy</a><br clear="none"></div></div><br><br></div> </div> </div> </div></div></body></html>