[sdiy] Analysis of frequency variation in analogue synths

[Magnus Danielson]

From: Ian Fritz <ijfritz at comcast.net>
Subject: Re: [sdiy] Analysis of frequency variation in analogue synths
Date: Thu, 03 May 2007 08:53:51 -0600
Message-ID: <6.2.1.2.2.20070503085210.020f0730 at mail.comcast.net>

> At 01:49 AM 5/3/2007, Magnus Danielson wrote:
> >  If you don't have a sine/cosine source, but only a sine source, then
> >don't dispare, the polyphase filter setup is easy enought to build and that
> >will do the phase-separation for you.
> 
> But if you only look at a single frequency, then you can make a very simple 
> phase splitter with a single transistor.

0/90 degree?

At a singel frequency all you need is a double RC-link and you are home.

Thing is, you are only using a singel frequency at the time, but you will
most probably want to run at several frequencies in order to handle different
synths and different settings. Polyphase solves that problem.

Cheers,
Magnus