Re: [sdiy] Re:

[Roman]

And of course I meant "smaller", not "closer"
in 3rd line below...  :-P

time to go home now...

Roman

---- Wiadomość Oryginalna ----
Od: Roman <modular at go2.pl>
Do: Todd Goodenow <toddgoodenow at yahoo.com>
Kopia do: synth-diy at dropmix.xs4all.nl
Data: Mon, 30 Jun 2003 17:04:22 +0100
Temat: [sdiy] Re: 

>Corner frequency depends on both capacitors, but changing
>only one of them will change filter's characteristics.
>I.e. when the cap at (+) of the opamp will be closer,
>there will be peaking, or in another words, resonance.
>But anyway it's much easier to make variable resistance
>than capacitance. 
>
>Roman
>
>---- Wiadomość Oryginalna ----
>Od: Todd Goodenow <toddgoodenow at yahoo.com>
>Do: synth-diy at dropmix.xs4all.nl
>Data: Fri, 27 Jun 2003 11:13:20 -0700 (PDT)
>Temat: 
>
>>
>>Ok so lets say you take a simple circuit design like
>>so
>>http://www.ecircuitcenter.com/Circuits/opsalkey1/opsalkey1.htm
>>
>>basically a single op-amp low pass filter. Now since
>>the frequency of the filter is set by one of the
>>capacitors, is it possible to use a variable capacitor
>>for variable frequency? For resonance could one set up
>>a feedback loop with a potientiometer controlling
>>amount? I'm new to this stuff but trying to figure out
>>my way along. I want to build a simple filter just to
>>get started (i don't want a kit either, I took a good
>>physics course and want to understand this stuff from
>>the ground up).
>>
>>thanks, todd
>>
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>