[sdiy] Cool 'ring modulator' schematic

[John Loffink]

This "ring modulator" design is virtually identical to the diode breakpoint
generators in the Patchell Wave/Voltage Shaper, one each of the positive and
negative subcircuits:

http://www.oldcrows.net/~patchell/synthmodules/shaper.html


FYI, according to the web site Jim still has boards available.

I use audio at the Diode Waveform Shape breakpoint modulation inputs to get
interesting crossmodulation of the input, similar to the "ring modulator"
circuit.

http://www.wavemakers-synth.com/motm/dws.html

Here are a couple of examples, the first with a simple patch structure, the
second which uses many processing modules, but at the core of the patch is
the DWS which forms a composite sound from all the pieces:

http://www.wavemakers-synth.com/motm/dws_mp3.html

John Loffink
The Microtonal Synthesis Web Site
http://www.microtonal-synthesis.com
The Wavemakers Synthesizer Web Site
http://www.wavemakers-synth.com


> -----Original Message-----
> From: owner-synth-diy at dropmix.xs4all.nl [mailto:owner-synth-
> diy at dropmix.xs4all.nl] On Behalf Of David Brown
> 
> I built this as well.  It is interesting.  No LO input bleeds through
> to the output. I tried a variety of waveforms on both inputs. You get
> all sorts of interesting artifacts out. I did try a comparator on the
> input to the LO.  That makes it interesting as it limits the effect
> ot just flipping polarity (e.g. it eliminates the other artifact)s.
> Then, you can play with the comparator level to generate a very
> narrow pulse for the LO input.  I put a quick scope image at
> http://modularsynthesis.com/images/EN-mixer.jpg
> 
> I think I might build this with input buffers, an RF attenuator, and
> a LO input that is selectable through a comparator with a variable
> reference level.
> 
> Dave
> 
> 
> At 09:01 PM 2/11/2006, harrybissell wrote:
> >
> >Its VERY COOL. A must-have imho.
> >
> >It works well throughout the audio range. And don't believe the
> >BS about the square wave. Use any waves you like.
> >
 > > Could be interesting. Here's a link
> > > http://www.elecdesign.com/Articles/ArticleID/11935/11935.html
> > >
> > > The writeup states that the design is 'limited to lower frequencies'
> > > which sounds like it would work for audio just fine. Also looks like
> > > it works with a variety of waveforms (unlike the square-only ARP XOR
> > > design).
> > >