Magnus freq doubler.

[Magnus Danielson]

From: "Bjorn Julin" <bnillson at hotmail.com>
Subject: Magnus freq doubler.
Date: Sun, 17 Sep 2000 02:18:29 GMT

Hi Björn,

> Your freq doubler does not work, to be able to get it to work
> you must be able to shift only 90 degrees and then level shift.
> 180 deg just creates triangles of a saw.
> 
> Pity, i had hoped that it would "have" worked,
> anyone for a simple analog 90 deg shifter??

Which irony... I used the frequency doubler as an inspiration to an 90 degree
phase shifter for sawtooths, a version of that you will find in Jörgen
Bergfors LFO section.

Now, to fix this, change the comparators reference voltage, that is... have
the pos input of U1A go into a trimmer...

Also, Jörgen skiped the diode, which is a smart move. The comparator will go
rail-to-rail without the diode, so then the DC correction R3 could be skiped.

So, you say I have made a saw-to-tri converter... hohoum...

Maybe time to breadboard this thing...

Cheers,
Magnus