[sdiy] Korg MS-50 VCA and VCF

[Colin f]

> -----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