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And then you have to retune the guitar by ear because the bass guitarist is adamant he sets the tuning for the band ! 😄</div>
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<div id="divRplyFwdMsg" dir="ltr"><font face="Calibri, sans-serif" style="font-size:11pt" color="#000000"><b>From:</b> Synth-diy <synth-diy-bounces@synth-diy.org> on behalf of Roman Sowa via Synth-diy <synth-diy@synth-diy.org><br>
<b>Sent:</b> 05 March 2025 11:06<br>
<b>To:</b> David G Dixon <dixon@mail.ubc.ca>; synth-diy@synth-diy.org <synth-diy@synth-diy.org><br>
<b>Subject:</b> Re: [sdiy] Transistor questions</font>
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<div class="PlainText">I can't believe that being a guitar player you still don't have any
<br>
tuner app installed on your phone yet. I always use tuner app, the one <br>
that looks like Boss TU-3, to tune everything musical and it works <br>
great. Despite having various options to measure frequency with lab <br>
equipment.<br>
<br>
Kind of sad to admit that the simplest, low parts count VCO designed 50 <br>
years ago is still one of the best tracking oscillators<br>
<br>
Roman<br>
<br>
W dniu 2025-03-05 o 01:08, David G Dixon via Synth-diy pisze:<br>
> <br>
> So, I just now tried to calibrate the VCOs, and they calibrate very nicely,<br>
> and it doesn't seem to matter whether I use the 3904/3906 pair or the<br>
> 945/733 pair. My frequency meter is on the fritz, so I just did it by ear,<br>
> and both VCOs were tracking octaves all across the audio range. I was<br>
> listening to the lowest of the four octave outputs from the VCOs (the one<br>
> that has been divided down three octaves), and at the highest frequency, I<br>
> was hearing notes near the top of the piano range, and they were in perfect<br>
> tune (by my ear, anyway). This means that the actual oscillator was<br>
> generating frequencies in the range that only dogs can hear, and it was<br>
> still tracking perfectly well. When I feed the VCOs a lower CV to put them<br>
> in the proper range, then they should track even more perfectly.<br>
> <br>
> I'm going to consign this whole episode to the "works perfectly, no need to<br>
> worry about it, proceed accordingly" file.<br>
> <br>
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