[sdiy] Transistor questions

[Roman Sowa]

I can't believe that being a guitar player you still don't have any 
tuner app installed on your phone yet. I always use tuner app, the one 
that looks like Boss TU-3, to tune everything musical and it works 
great. Despite having various options to measure frequency with lab 
equipment.

Kind of sad to admit that the simplest, low parts count VCO designed 50 
years ago is still one of the best tracking oscillators

Roman

W dniu 2025-03-05 o 01:08, David G Dixon via Synth-diy pisze:
>   
> So, I just now tried to calibrate the VCOs, and they calibrate very nicely,
> and it doesn't seem to matter whether I use the 3904/3906 pair or the
> 945/733 pair.  My frequency meter is on the fritz, so I just did it by ear,
> and both VCOs were tracking octaves all across the audio range.  I was
> listening to the lowest of the four octave outputs from the VCOs (the one
> that has been divided down three octaves), and at the highest frequency, I
> was hearing notes near the top of the piano range, and they were in perfect
> tune (by my ear, anyway).  This means that the actual oscillator was
> generating frequencies in the range that only dogs can hear, and it was
> still tracking perfectly well.  When I feed the VCOs a lower CV to put them
> in the proper range, then they should track even more perfectly.
> 
> I'm going to consign this whole episode to the "works perfectly, no need to
> worry about it, proceed accordingly" file.
> 
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