[sdiy] How does the JX3P VCA work?

[Pete Hartman]

I built one of these, but I don't recall the "selected" notation, so
I'm pretty sure I didn't use matched transistors.  I decided that
while it worked, it did add distortion that I didn't like, so I
abandoned the original plan which was to put 6 of them on a stripboard
and make a hex VCA.

On Wed, Jan 15, 2014 at 7:09 AM, Neil Johnson <neil.johnson71 at gmail.com> wrote:
> Mattias Rickardsson wrote:
>> Florian Anwander wrote:
>>> it doesn't make sense to have all 6 VCAs made from the same match pattern
>>
>> Unless you want all 6 voices to behave the same. ;-)
>
> From these images it looks like all the transistors for a given
> function have the same colour spot:
>
> http://www.syntaur.com/images/4461-Lg.jpg
> http://213.129.73.14/aa_dt_new/forums/attatchments/jx3p_dismantled_1.jpg
>
> Also on this one:
> http://fa.utfs.org/diy/jx3p/schemo/JX3P_voiceboard_voice_location.jpg
>
> Neil
> --
> http://www.njohnson.co.uk
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