[sdiy] Making a HPF using a LPF...??

[houshu at muj.biglobe.ne.jp]

Hi JP,

What do you mean by LPF?  If your LPF is a VCF, there is an example:

  http://www5b.biglobe.ne.jp/~houshu/synth/moritaVCF76.gif

Trim pot is needed to get good response.

Adding HP input is another method:

  http://www5b.biglobe.ne.jp/~houshu/synth/Vcfv0212.GIF

  http://houshu.at.webry.info/201010/article_2.html

In most cases, they are not "pure" HPFs, 
but not-pure HPF in MS20 is sufficiently useful.

Sam HOSHUYAMA
Saitama, JAPAN

----------
From: "Jean-Pierre Desrochers" <jpdesroc at oricom.ca>
Date: 2012/4/10 23:24:06
HI list,
Maybe it's a dumb question but
I need to make some light on the following..
Can I make a High pass filter using a Low pass filter
and a summing amp using both positive and negative inputs?
Suppose the following:
A wave form passes thru a LPF, then we mix
the LPF output filtered wave (negative input)
with the LPF input unfiltered wave to the mixing amp
positive input.
Will the summing amp output be a HPF from
the incoming wave ?

JP

 
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