30 years later...

[Magnus Danielson]

> I don't have a Serge but I built a waveshaper based on Serge and Frank Evatoffs Patent (sorry I don't have the number handy, try Qpat on the 
> web)Which is basically a full wave rectifier with offset.  The circuit uses 1/4 LM3900 per rectifier.  It's worth a look at as it makes very clever
> use of the fact that the 3900's non inverting input is a current mirror attached to the inverting input.
> 
> So how does it sound..... Interesting rather than radical, certainly worth the few cents that a quarter LM3900 costs.  If you are interested I can 
> supply you with more details.

Please do!

> Glad that the wave multiplier (also from Serge) was mentioned.  To recap some earlier postings it consists of three separate processors:
> 
> The first appears to be a 3080 wired as a vca with a switched attenuator on the input so that the clipping either occurs at the input or the output
> of the 3080 (think valve guitar amps).  Bob Moog patented a distortion device that uses this technique ( along with a full wave rectifier).
> 
> The second segment I think is made from four cascaded full wave rectifiers (the 3900 type ?).  Such a configaration would do what the brochure 
> describes.
> 
> The third section... well I would really like to know how that works.  Like all the best ideas its probably very simple. It is described as sweeping 
> through the low order odd harmonics as the VC input is varied.  You could probably realise this using De Moivres(?) theorem, but that seems to 
> complex  for the cost of the module.

Hmm... interesting.

I would also like to know more in detail what is happening inside that Serge
Wavemultiplier...

Magnus