[sdiy] MAD 1108 VCF6

gino wong wonggster at gmail.com
Thu Sep 13 18:33:20 CEST 2007


It sounds like his is just a good filter design that could be
perfected but is already really nice.  I think a VCFC6 tune up page is
in order.  The diodes or the chips, transistor change (how to shoehorn
a 2sc1583 in), the feedback caps, the trimpot addition.


On 9/12/07, Tom Arnold <xyzzy at sysabend.org> wrote:
> On Tue, Sep 11, 2007 at 06:57:54PM -0400, Dave Magnuson wrote:
> > Hi Gino,
> >
> > I built an EFM VCF6 with unmatched 1N914 and it sounds pretty good to me....
> >
> > Maybe I just got lucky?
>
> As has been pointed out before, MAD1108's arn't matched...  I just took a
> bag of 100 1N914's and matched by hand.  I also replaced the diff transistor
> pair with a 2SC1583 ( Harry's suggestion ).
>
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