[sdiy] Noob Question: Passive Filter Design

[Barry Klein]

Actually such a thing got me interested in electronic music -
the Bell Labs voice synthesis kit.  I can't remember if the coils
were DIY or premade.  I still have an untouched one of these kits
I was going to have my son construct but I don't think he'd be
very motivated now..
http://www.porticus.org/bell/belllabs_kits_ss.html

Barry


-----Original Message-----
From: synth-diy-bounces at dropmix.xs4all.nl
[mailto:synth-diy-bounces at dropmix.xs4all.nl] On Behalf Of David G. Dixon
Sent: Tuesday, May 04, 2010 11:50 AM
To: 'Tom Ivar Helbekkmo'; 'Sam Ecoff'
Cc: 'sdiy DIY'
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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