[sdiy] ok... I give up...

[Christian Oncken]

Thanks to all, but no luck so far...

its not J. Haible's, but it looks similar to some of the 1496 ringmods I've
seen around.

Actually, this may be what I'm looking for.  The circuit in question is very
simple; an mc1496, 4 caps, ~10 resistors, 1 trimpot, and thats it... I
remember it working well, which in my book is "making wierd sounds".
However, the description did say "simple frequency shifter" and from reading
the app notes I thought that this was an SSB modulator, or a ringmod with
only 1 sideband instead of 2... my intention was to get shortwave radio type
sounds out of it, and I remember being happy with it in that regard.

The app notes for the mc1496 have schematics for using it as a balanced
modulator/demodulator, and an ssb product detector... maybe the circuit I'm
looking for was really a ringmodulator mislabeled as a frequency shifter...
Which is ok... I just want to find the schematic I built the thing from and
get it working like it was.

For my purposes, its not necessary that it cover the whole audio range...
mainly just vocal ranges.  I've *almost* got it working from messing with it
last night...

Christian.




> >Somebody had a schematic for a simple frequency shifter on their
> page.  It
> >was made with an MC1496.  Its different from the ones in the app
> notes for
> >this chip.
>
> To make a frequency shifter that works over the whole audio
> range, you need a
> 90 degree phase shift network that is uniform over the audio range & it is
> not so simple.
>
> It *IS* easy to make a ring modulator with a 1496, though.
>
> paul perry (Frostwave analog fx) Melbourne Ausstralia
>