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I'm going fo it (Synthicon VCF)

2004-05-06 by earthtodylan2000

With everyones help and good advise I've decided to build a
Synthicon VCF.

Does anyone have a current Mouser part # list for the VCA?
Something I can send to them to order.

Thanks,
David Scott Stone

Re: I'm going fo it (Synthicon VCF)

2004-05-06 by Ryan Williams

earthtodylan2000 wrote:

> With everyones help and good advise I've decided to build a
> Synthicon VCF.
>
> Does anyone have a current Mouser part # list for the VCA?
> Something I can send to them to order.
>
> Thanks,
> David Scott Stone

If you meant parts for the VCF then, there's one at Bob Knarley's synth
page:
http://www.bobknarley.com/synth/parts/parts.html

I bought my parts a while back for about $8. it's too bad, mouser makes
you buy 10packs of those resistors now. This is a cool filter though. I
finally built me one about a week ago. When I get some time I'm going to
try and add CV to the Resonance. Still trying to analyze the circuit,
anyone have the circuit equations written down?

--Ryan

Re: I'm going fo it (Synthicon VCF)

2004-05-06 by thee_vaporizer

> finally built me one about a week ago. When I get some time I'm

going to

> try and add CV to the Resonance. Still trying to analyze the

circuit,

> anyone have the circuit equations written down?
>
> --Ryan

Most interested in that mod, keep us updated !
Does adding a potmeter for the resonance give good results ?

Re: I'm going fo it (Synthicon VCF)

2004-05-06 by itsatwistah

The original article on the filter by Nyle Steiner can be found here:

http://www-timc.imag.fr/Yves.Usson/personnel/SDIY/archives/Sallen-Key-
2P.pdf

Cheers,
Scott

--- In cgs_synth@yahoogroups.com, Ryan Williams <destrukto@g...>
wrote:

Show quoted textHide quoted text

> earthtodylan2000 wrote:
>
> > With everyones help and good advise I've decided to build a
> > Synthicon VCF.
> >
> > Does anyone have a current Mouser part # list for the VCA?
> > Something I can send to them to order.
> >
> > Thanks,
> > David Scott Stone
>
> If you meant parts for the VCF then, there's one at Bob Knarley's

synth

> page:
> http://www.bobknarley.com/synth/parts/parts.html
>
> I bought my parts a while back for about $8. it's too bad, mouser

makes

> you buy 10packs of those resistors now. This is a cool filter

though. I

> finally built me one about a week ago. When I get some time I'm

going to

> try and add CV to the Resonance. Still trying to analyze the

circuit,

> anyone have the circuit equations written down?
>
> --Ryan

Re: I'm going fo it (Synthicon VCF)

2004-05-06 by Richard Brewster

Bob Knarley's parts list for the Synthacon VCF is a good one. It's
important to use good capacitors. The 23PS222 polystyene part
especially. I used metalized polyester caps for the 1uf values that pass
the signal, Mouser 75-MKT1826510064. Also, it is worth looking at the
message archives for resistor values to use on the CV inputs, as given
by John Loffink. In my Synthacon's, I substituted a 100nf capacitor for
the 1uf on the base of the 2N2222 that mixes the CV inputs. This cap
adds some lowpass filtering on the CV. I don't know why it was 1uf. I
found several older Synthacon circuits on the Internet, and some of them
omitted this cap.

I did not add a VCA for resonance control. So I can't help there.

10 packs of resistors? I started buying 200 packs of the common
values. Only $4.00. The price drops to 2 cents each.

-Richard Brewster

Ryan Williams wrote:

Show quoted textHide quoted text

>earthtodylan2000 wrote:
>
>
>
>>With everyones help and good advise I've decided to build a
>>Synthicon VCF.
>>
>>Does anyone have a current Mouser part # list for the VCA?
>>Something I can send to them to order.
>>
>>Thanks,
>> David Scott Stone
>>
>>
>
>If you meant parts for the VCF then, there's one at Bob Knarley's synth
>page:
>http://www.bobknarley.com/synth/parts/parts.html
>
>I bought my parts a while back for about $8. it's too bad, mouser makes
>you buy 10packs of those resistors now. This is a cool filter though. I
>finally built me one about a week ago. When I get some time I'm going to
>try and add CV to the Resonance. Still trying to analyze the circuit,
>anyone have the circuit equations written down?
>
>--Ryan
>
>
>
>

Re: I'm going fo it (Synthicon VCF)

2004-05-07 by Larry Hendry

> 10 packs of resistors? I started buying 200 packs of the common
> values. Only $4.00. The price drops to 2 cents each.
> -Richard Brewster

Me too. Now, I rarely have to buy a resistor because of the stock I
built up ordering them this way. Why pay 9 cents when you can pay 2?
:)
Larry

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Re: I'm going fo it (Synthicon VCF)

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