<p dir="ltr" style="margin-top:0; margin-bottom:0;">Looks very much like LM13700 to me, so why bother?</p>
<br>
<p dir="ltr" style="margin-top:0; margin-bottom:0;">Roman </p><br><br>---- Użytkownik Tom Wiltshire napisał ----<br><br>Interestingly, thre are a few minor differences between the reverse-engineered Open Music Labs schematic (which the Re-303 uses) and the Alfa clone. Some of the differences are obvious stuff, like diode-connected transistors being shown as diodes, for example, but not everything.<div class=""><br class=""></div><div class="">Here's the Open Music Labs version:</div><div class=""><br class=""></div><div class=""><a href="http://wiki.openmusiclabs.com/wiki/x0xb0x" class="">http://wiki.openmusiclabs.com/wiki/x0xb0x</a></div><div class=""><br class=""></div><div class="">And here's Alfa's:</div><div class=""><br class=""></div><div class=""><a href="https://www.alfarzpp.lv/eng/sc/AS662D.pdf" class="">https://www.alfarzpp.lv/eng/sc/AS662D.pdf</a><br class=""><div class=""><div class=""><div><br class=""></div><br class="Apple-interchange-newline">

</div>
<div><br class=""><blockquote type="cite" class=""><div class="">On 19 Jun 2023, at 13:10, Todd Sines <<a href="mailto:sines_list@scale.la">sines_list@scale.la</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><meta http-equiv="content-type" content="text/html; charset=utf-8" class=""><div dir="auto" class="">Din Sync make them for their RE-X0X series<div class="">That link would be here <div class=""><div style="display: block;" class=""><div style="-webkit-user-select: all; -webkit-user-drag: element; display: inline-block;" class="apple-rich-link" draggable="true" role="link" data-url="https://shop.re-303.com/product/ba662-clone/"><a style="border-radius:10px;font-family:-apple-system, Helvetica, Arial, sans-serif;display:block;-webkit-user-select:none;width:300px;user-select:none;-webkit-user-modify:read-only;user-modify:read-only;overflow:hidden;text-decoration:none;" class="lp-rich-link" rel="nofollow" href="https://shop.re-303.com/product/ba662-clone/" dir="ltr" role="button" draggable="false" width="300"><table style="table-layout:fixed;border-collapse:collapse;width:300px;background-color:#E9E9EB;font-family:-apple-system, Helvetica, Arial, sans-serif;" class="lp-rich-link-emailBaseTable" cellpadding="0" cellspacing="0" border="0" width="300"><tbody class=""><tr class=""><td vertical-align="center" class=""><table bgcolor="#E9E9EB" cellpadding="0" cellspacing="0" width="300" style="font-family:-apple-system, Helvetica, Arial, sans-serif;table-layout:fixed;background-color:rgba(233, 233, 235, 1);" class="lp-rich-link-captionBar"><tbody class=""><tr class=""><td style="padding:8px 0px 8px 0px;" class="lp-rich-link-captionBar-textStackItem"><div style="max-width:100%;margin:0px 16px 0px 16px;overflow:hidden;" class="lp-rich-link-captionBar-textStack"><div style="word-wrap:break-word;font-weight:500;font-size:12px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-topCaption-leading"><a rel="nofollow" href="https://shop.re-303.com/product/ba662-clone/" style="text-decoration: none" draggable="false" class=""><font style="" class="">BA662 Clone – RE-303 Web Shop</font></a></div><div style="word-wrap:break-word;font-weight:400;font-size:11px;overflow:hidden;text-overflow:ellipsis;text-align:left;" class="lp-rich-link-captionBar-textStack-bottomCaption-leading"><a rel="nofollow" href="https://shop.re-303.com/product/ba662-clone/" style="text-decoration: none" draggable="false" class=""><font color="#A2A2A9" style="color: rgba(60, 60, 67, 0.6);" class="">shop.re-303.com</font></a></div></div></td><td style="padding:6px 12px 6px 0px;" class="lp-rich-link-captionBar-rightIconItem" width="36"><a rel="nofollow" href="https://shop.re-303.com/product/ba662-clone/" draggable="false" class=""><span id="cid:72BB9D0E-6FE2-4467-B7A9-C24E9BB82A9A"><favicon.ico></span></a></td></tr></tbody></table></td></tr></tbody></table></a></div></div><br class=""><br class=""><div dir="ltr" class=""><span style="background-color: rgba(255, 255, 255, 0);" class="">Todd</span><div class=""><div class=""><font style="background-color: rgba(255, 255, 255, 0);" class=""></font></div></div></div><div dir="ltr" class=""><br class=""><blockquote type="cite" class="">On Jun 19, 2023, at 4:39 AM, Tom Wiltshire <<a href="mailto:tom@electricdruid.net">tom@electricdruid.net</a>> wrote:<br class=""><br class=""></blockquote></div><blockquote type="cite" class=""><div dir="ltr" class=""><meta http-equiv="Content-Type" content="text/html; charset=us-ascii" class="">Yes, Alfa make a clone - or at least a chip with that number:<div class=""><br class=""></div><div class=""><a href="https://www.alfarzpp.lv/eng/sc/AS662D.pdf" class="">https://www.alfarzpp.lv/eng/sc/AS662D.pdf</a></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">
<div class=""><br class=""><blockquote type="cite" class=""><div class="">On 19 Jun 2023, at 04:41, Adam (synthDIY) <<a href="mailto:synthdiy@adambaby.com" class="">synthdiy@adambaby.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div class="">Actually, yes you're right, the Roland BA662 OTA that they used a lot around this time, both for VCAs and VCFs. I've sent you the schematic.<br class=""><br class="">I think they've been cloned successfully in recent years<br class=""></div></div></blockquote></div></div></div></blockquote></div></div></div></div></blockquote></div><br class=""></div></div>