[sdiy] DCO ramp core / capacitor discharge transistors

[Pete Swarbrick]

The Moog Rogue uses 2N3906 NPN. I remember being both impressed and
appalled at the crudeness of this machine - seriously built down to a
price !


P
-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of Dave Manley
Sent: 16 December 2008 23:01
To: synth DIY
Subject: Re: [sdiy] DCO ramp core / capacitor discharge transistors

Tom Wiltshire wrote:

> 
> Can anyone tell me why we need to use a FET for the VCO, if the DCO
can 
> get by with a NPN?

I can't name them off the top of my head, but there are VCO designs that

use an NPN transistor instead of a FET for the timing cap reset.  I 
might have time to dig through some schematics tonight...

-Dave

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