Magnus freq doubler.

[Bjorn Julin]

Hi.

>>>Now, to fix this, change the comparators reference voltage, that >>is... 
>>>have the pos input of U1A go into a trimmer...
>>
>>Comparators!!! arrrhhh,,! What the hell.!, I have misintepeteted
>>your design intention, ofcourse it works when its a comparator 
>> >>function..

>Phew... I just thought I made a fool of myself just because I did not 
>actually build it..

Hahaha, "who" are now transpiring salt water from his back? :-D
(not to mention all the salt i allready have transpired.)

>The whole trick is to build a 50 % PWM to be used to add another >reset 
>jump. When one makes a sawtooth phase shifter, one takes the >same idea but 
>instead moves the jump. This causes a DC error, but >since this is linearly 
>dependent with the phase voltage, it is just >a matter of adding the phase 
>voltage at the
>output summing to be home free.

Exactly, this is allso done in the ARP chroma, but the
chroma used to many components for what i was looking for.

Actually, my reason for this frequency doubling and soft sync
issues is that i have been laborating around a design for some
time now, that uses "one" analoge oscillator to create additive synthesis in 
a combination of 0-180 deg phase shifting and voltage controlled soft sync 
to create new waveforms. So i had tried a
load of different solutions  and become desperate for a simple
sawtoth freq doubler.Ofcourse one can do all the stuff with a
bucket load of componenets, but the trick is to do it all with a absolute 
minimum of components. So far the oscillator sounds wery interesting and i 
have managed to get over 40 different wave shapes, quite intresting is the 
simple continous phase shifting (0-180 deg.)

Phase modulation of both square and sawtoth is possible, as you
know it produces modest vibrato effects, if one was just able to
shift 360 degrees!

Some of the problems i have to solve is amplitudes,
some sort of DC ALC seams to be a soulution.

>I guess I should have made a more comprehensive explanation of the 
> >curcuit,others would have been even more confused about this little 
> >trick.

Just some brief explenation would be enough.

> > >Maybe time to breadboard this thing...
> >
Ah, so you ment, "you" was going to bread board it,
i tought you ment me!!

> > BJ (going blind in the desperate shearch of a freq doubler)

>Hopefully will this one do the trick, or at least act as an source of
>inspiration. Maybe I should redo it without the diode...

What important is exact amplitude balancing of the saw and square.
The diode is ok if one wants unipolar wave only .

Why not using a three way switch?

BJ
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