[sdiy] Multiplier vs VCA

[Mike Gorman]

Aaron,

It does look like the CA3019 in the VCA is incorrect, but as pins 2 and 5
are effectively shorted; the circuit will function correctly as shown (Just
sketch out the diodes on a piece of paper, ignoring the shorted and reversed
diode between pins 2 and 5. Pins 2 and 5 are transposed as well).

Regards

Magman

-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Aaron Lanterman
Sent: 07 July 2009 05:06
To: synth diy
Subject: Re: [sdiy] Multiplier vs VCA


On Jun 28, 2009, at 1:48 PM, Derek Holzer wrote:

> MS-50 VCA schematic, BTW:
>
>
http://machines.hyperreal.org/manufacturers/Korg/MS-synths/schematics/ms50fi
lt.gif


Hmmm... are the diodes in the VCA messed up? Maybe I'm misreading  
something.

That's a rather interesting schematic overall. The filter is like the  
Yamaha GX-1 filter.

- Aaron
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