[sdiy] DCO ramp core / capacitor discharge transistors

[Laurie Biddulph]

The Elektor Formant VCO's use an NPN for the switching transistor

Best Regards

(Mr) Laurie Biddulph
Phone: +61 (0)2 4340 0938
Mobile: 0400 257 645

Elby Designs
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----- Original Message ----- 
From: "Pete Swarbrick" <peter.swarbrick at panavision.co.uk>
To: "Dave Manley" <dlmanley at sonic.net>; "synth DIY" 
<synth-diy at dropmix.xs4all.nl>
Sent: Wednesday, December 17, 2008 9:03 PM
Subject: RE: [sdiy] DCO ramp core / capacitor discharge transistors


> 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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