[sdiy] Useful equipment

[harry]

I use a Korg DT-1 tuner.   I also send the signal into a scope
and beat it with a signal generator (x-y display)... just to prove that the
tuner isn't lying.

In the high octaves you need to be sure the tuner is reading the
fundamental.

I also have a precision voltage source I made that covers 9
octaves... this makes tuning VCOs a lot easier...

H^) harry

mark verbos wrote:

>   Why not send an alternating 0v and 1volt from a sequencer. also
> croosfade between the original oscillator square wave and a octave
> devided one. Then you just tweek until you hear no change in frequency.
>
> The arp sequencer has quantized otus making this really effective. i
> guess you do need a DVM to cal the sequencer though....
>
> mark
>
> René Schmitz wrote:
>
> > At 10:46 03.08.02 -0500, Paul Schreiber wrote:
> >
> >> You guy's are doing it "backwards". You can get a cheap freq counter
> >> for $100 on eBay. As long as
> >> the VCO frequency is correct, the 0.000001V on the DVM doesn't
> >> matter. My Kenton Pro-2000 is
> >> about 5% off from my Encore Expressionist MIDI-to-CV, but who cares?
> >> [:)]
> >>
> >
> > Well I don't know if this qualifies as "sdrawkcab", but the way I have
> > been doing VCO calibration doesn't involve a DVM. I simply play octave
> > jumps on my controller (usually a Midi2CV interface) doubled by
> > another instrument, and bring the VCO in tune using the normal tune
> > pot for the lower note. Then I calibrate the V/oct setting until the
> > higher note is in tune. Then the cycle repeats, until the right
> > setting is found.
> > I also occasionally used a shortcut to this. I feed the VCO into a
> > delay, whose delay time is the same as the octave jumps from my
> > sequencer (via the interface). I mix the VCO with that so that both
> > notes blend into each other. One can easily find the proper setting,
> > as the octaves blending into each other have a characteristic harmonic
> > sound. No need to touch the tuning pots to find the proper v/oct gain.
> > Also it makes it easy to check that gain over the sweep range, by
> > changing the VCO frequency manually. Or by going to two or three
> > octave jumps.
> >
> > However when calibrating the Midi2CV interface I used a DVM.
> >
> > Cheers,
> > René
> >
> >

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