<div dir="ltr">Hi Josh,<div><br></div><div><div>I built this synth around 1979.</div><div>Sonically it is a very interesting synth.<br></div><div><br></div><div>Some chips are very difficult to be found nowadays and are very expensive.</div></div><div><div>One is the uA726C (as well as AD820).</div><div>As does not affect the sound directly, it can be replaced.<br></div><div><br></div><div>Another difficult item is the CA3080, one of the first OTA generations.</div></div><div>With some creativity the CA3080 may be replaced by another OTA without significantly affecting the sound, since the CA3080 features perceptible variations from one CI to another...<br></div><div><br></div><div>Apart from these details, it is an easily constructible synth.<br></div><div><br></div><div>Vinicius Brazil</div><div><br></div><div>VBrazil Systems</div><div><br></div></div><div class="gmail_extra"><br><div class="gmail_quote">On Sun, Nov 8, 2015 at 11:02 AM, josh wilkinson <span dir="ltr"><<a href="mailto:j_wilco@hotmail.com" target="_blank">j_wilco@hotmail.com</a>></span> wrote:<br><blockquote class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><br>
Hello All,<br>
<br>
My name is Josh Wilkinson, i am part of a Hackerspace in Brisbane Australia.<br>
<br>
Myself and a group of electronics enthusiasts (ranging form electricians to programmers to mechatronics) are keen to build the Elektor Formant synth.<br>
We have been reading book 1that was published with all the schematics and notes in it.<br>
Has anyone had any experience building this synth?<br>
<br>
Our main priority obviously is generating a proper PCB file that we can replicate for the modules. Has anyone already converted the PCB schematics in the book to Gerber files?<br>
If anyone has and feels like sharing that would be incredibly helpful.<br>
<br>
Also any leads on tracking down the tricky Fairchild chips?<br>
<br>
Really any experience with this build would be appreciated.<br>
<br>
Cheers,<br>
Josh and HSBNE Crew.<br>
Sent from my iPhone<br>
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