[sdiy] Korg MS-50 VCA and VCF

[grant at musictechnologiesgroup.com]

There is a data sheet link here:

http://cgi.ebay.com/ws/eBayISAPI.dll?ViewItem&item=250623934500

which leads to:

http://www.musictechnologiesgroup.com/files/TA54-78s.pdf

GB




> -------- Original Message --------
> Subject: Re: [sdiy] Korg MS-50 VCA and VCF
> From: "Colin f" <colin at colinfraser.com>
> Date: Fri, April 30, 2010 7:07 am
> To: "'synth diy'" <synth-diy at dropmix.xs4all.nl>
> 
> 
> > -----Original Message-----
> > From: synth-diy-bounces at dropmix.xs4all.nl 
> > [mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of 
> > Harry Bissell
> > Sent: 30 April 2010 14:58
> > To: JH.
> > Cc: synth diy
> > Subject: Re: [sdiy] Korg MS-50 VCA and VCF
> > 
> > The CA3019 was readily available at that time and had 
> > excellent matching due to monolythic construction. It was 
> > used in many 'ring modulator' type circuits at the time. A 
> > natural extension would be to use it as Korg did.
> > 
> > BTW, you could use the CA3046 transistor array as diodes in a 
> > similar fashion. Just watch the substrate...
> 
> The Korg 770 used a TA78 - an array of 5 NPN transistors with commoned
> emitters in a SIP package.
> Anyone know what pinout is used in the 770 ?
> With a common emitter for all transistors, they must be using some of the
> base-collector junctions.
> Does that make any difference when using a transistor as a diode ?
> 
> Cheers,
> Colin f
> 
> 
> 
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