[sdiy] MC1495 multiplier chip discontinued completely

[Scott Gravenhorst]

"jhaible" <jhaible at debitel.net> wrote:
>Good overview, MC.
>A few additions:
>
>> The Fet sign changer is simple, but only useable for "effect" sounds.
>> I.e.: very agressive modulation, basically the same as a square wave
>> driven real multiplication device.
>> So it's use is very limited. Those "soft" sounds I have mentioned
>> are not available at all.
>
>But there is a FET based RM that uses the FET as a VCR, and not just as
>a switch. As used by Korg. I have copied this circuit to preserve the
>PS-3x00 series own character. It's part of this drawing:
>http://www.oldcrows.net/~jhaible/polykorg/jh_3200_signal_3of4.gif
>Look for the part between "direct out" and "AM out". The LDRs just perform
>a wet/dry mix; the multiplication is done with a 2SK30AFET.
>This is *not* clean (the modulator wave is quite distorted. The PS-synths
>don't even have a sine wave modulator, so a distortaed triangle might be as
>good as an undistorted triangle ...), but it's certainly not a crude square
>wave
>modulation, either.

Thanks Jürgen, this is what I meant by a "FET" "ringmod".  Looks pretty
simple.  Given I'm concerned only with timbre modification, will this sound
that much different from a 1496 or AD633?

Will this work with 2N3819 and TL082?

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