[sdiy] Noob Question: Passive Filter Design

[Harry Bissell]

The exercise is left up to the reader

Its possible to just replace the capacitors in a Moog
ladder filter with inductors and make it a highpass
filter.

Run a simulation if you like...

then try to BUY the components required.  

(you'll quickly find out that building circuits with inductors
can require absurd values, and parts that are 'ideal' and don't
exist in the real world).

Inductors can be used in active filter design, a good number of
guitar 'wah' pedals used them. The overall 'sound' of the unit
depended on the actual part selected. Some parts worked well,
some sucked

H^) harry



----- Original Message -----
From: David G. Dixon <dixon at interchange.ubc.ca>
To: 'Tom Ivar Helbekkmo' <tih at hamartun.priv.no>, 'Sam Ecoff' <secoff at execpc.com>
Cc: 'sdiy DIY' <synth-diy at dropmix.xs4all.nl>
Sent: Tue, 04 May 2010 14:49:32 -0400 (EDT)
Subject: Re: [sdiy] Noob Question: Passive Filter Design

> "An active filter needs no inductors. Instead, op amps, resistors, and
> capacitors are used for better results. Advantages include lower cost,
> easy tuning, simple design, and modularity."
> 
> It's at <http://www.amazon.com/gp/product/075062986X>.  Comments, anyone?

I would guess that very few souls here would ever build a synth filter with
inductors, especially when the alternative is so easy.  My personal attitude
is that inductors should be reserved for VHF applications.

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-- 
Harry Bissell & Nora Abdullah 4eva