<html><head></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, sans-serif; "><div>ETI Canada featured many of Tim Orr's electro music articles and circuits.</div><div><br></div><div>He wrote for PE (Practical Electronics UK) as well. Excellent series on op-amps.(Feb '79)</div><div>And of course Wireless World Elektor Formant synthesizer with D.W. Thomas. (Aug. – Oct. 1973)</div><div><br></div><div>Yes he did work for EMS in the early 70s but forget which designs are credited to him.</div><div><br></div><div>Tony K</div><div><br></div><span id="OLK_SRC_BODY_SECTION"><div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: medium none; PADDING-TOP: 3pt"><span style="font-weight:bold">From: </span> Adam Inglis <<a href="mailto:21pointy@tpg.com.au">21pointy@tpg.com.au</a>><br><span style="font-weight:bold">Date: </span> Mon, 17 Dec 2018 14:57:47 +1000<br><span style="font-weight:bold">To: </span> René Schmitz <<a href="mailto:synth@schmitzbits.de">synth@schmitzbits.de</a>><br><span style="font-weight:bold">Cc: </span> <<a href="mailto:synth-diy@synth-diy.org">synth-diy@synth-diy.org</a>><br><span style="font-weight:bold">Subject: </span> Re: [sdiy] Mind blown -- TL074 saturated outputs different<br></div><div><br></div><blockquote id="MAC_OUTLOOK_ATTRIBUTION_BLOCKQUOTE" style="BORDER-LEFT: #b5c4df 5 solid; PADDING:0 0 0 5; MARGIN:0 0 0 5;"><span class="Apple-style-span" style="border-collapse: separate; color: rgb(0, 0, 0); font-family: Calibri; font-style: normal; font-variant: normal; font-weight: normal; letter-spacing: normal; line-height: normal; orphans: 2; text-align: -webkit-auto; text-indent: 0px; text-transform: none; white-space: normal; widows: 2; word-spacing: 0px; -webkit-border-horizontal-spacing: 0px; -webkit-border-vertical-spacing: 0px; -webkit-text-decorations-in-effect: none; -webkit-text-size-adjust: auto; -webkit-text-stroke-width: 0px; font-size: medium; "><div>Just found this VCO schematic online that features this:</div><div><br class=""></div><div>page 16</div><div>dual integrator quadrature VCO (sinusoidal, not sure how useful for synths) using 3080 OTA</div><div><br class=""></div><div><a href="https://www.americanradiohistory.com/Archive-Electronics-Today/Canada/70s/ETI-CA-1978-12.pdf" class="">https://www.americanradiohistory.com/Archive-Electronics-Today/Canada/70s/ETI-CA-1978-12.pdf</a></div><div><br class=""></div><div>Article is by Tim Orr, who I think used to work for EMS?</div></span><br class="Apple-interchange-newline"></blockquote></span></body></html>