[sdiy] MS-20 tempco (was Model D service)

[David G Dixon]

So, Tony, how do they get the voltages required for the various
equal-tempered pitches (voltages in a 2^(N/12) ratio)?
 

> -----Original Message-----
> From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On 
> Behalf Of Tony Kalomiris
> Sent: Tuesday, May 09, 2017 12:46 AM
> To: synth-diy at synth-diy.org DIY
> Subject: Re: [sdiy] MS-20 tempco (was Model D service)
> 
> Also a cost cutting measure.
> Strange how the modulation on the MS-20 sounded so "musical" 
> and yet the same arrangement on the Jupiter-6 (exp.Fm) sounds 
> like sh*t.
> 
> 
> On 2017-05-09, at 3:37 AM, Tony Kalomiris wrote:
> 
> > Yes excellent description Roman, thanks.
> > 
> > Only downside was this was limited to 3 1/2 (0 ~ 8.4 V) or 
> 4 octaves 
> > (MaxiKorg) , as opposed to ten octaves of exponential 
> input. (VCO 1+2)
> > 
> > On 2017-05-09, at 3:20 AM, Roman Sowa wrote:
> > 
> >> The expo pair in MS20 is used only for modulation and 
> external V/oct sources, while keyboard pitch is provided as 
> linear voltage (Hz/V) derived from stable source. So without 
> any modulation, at ballanced state of the pair, when there's 
> 0V between bases, the VCO core current is not dependent on 
> those transistors and their temperature effects.
> >> 
> >> That's one of the beauties of Hz/V systems, it's so easy 
> to make the pitch stable.
> >> 
> >> Roman
> >> 
> > 
> 
> 
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