[sdiy] Expo-Con

[Michael Bachman]

 I use a SNARK tuner on one osc and then tune the others listening to
the beat frequency.

On Wed, Feb 4, 2015 at 5:11 PM, David G Dixon <dixon at mail.ubc.ca> wrote:
>> >Incidentally I would be curious to know how others are 'tuning'
>> >synthesizers these days (my favourite is reference beating
>> and 'listening'
>> >(have strobe tuner and counter...)
>
> I use a Chinese cheapo Victor 921A pocket multimeter with a frequency
> counter.  I have benchmarked it against an expensive Fluke frequency meter,
> and it is spot on.  I paid about $20 for it at a local store, but you can
> get them online for about $12, I believe.  That, and an octave generator in
> the form of a 12-throw rotary switch with a chain of hand-matched 10k
> resistors and the output buffered through an opamp.  This device generates
> 1-volt increments well within +/- 1 mV, and can be customized to work with
> either 12V or 15V supplies.  We use those to calibrate all of the Dixies,
> Rubicons, and Atlantises (and Korgasmatrons, Dr. Octatures, and uVCFs) at
> Intellijel as well.  It takes about half an hour to go through a string of
> 100 resistors and find 11 that all read the same resistance to four digits.
> I just buy 100 resistors on tape and put a little felt-tip dot on the tape
> next to the ones that read 10.00k.  Then I just go and harvest as many of
> these particular resistors as I need to make a switch.  I suppose that I
> could buy 0.1% resistors, but I'm too damn cheap.
>
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