ringmod

[Paul Perry]

At 11:03 AM 28/10/98 +0100, marjan wrote:
>Would there be some better results if you place 
>"ideal diodes" (diode in inverting opamp feedback) instead
>diodes in ringmod circuit with transformers ?
>(not passive circuit anymore,if it works anyway) 
>
my understanding (from texts on RF mixers, which are the
same in principle) is that it is the 'square law' shape of
the non-ideal diode that gives the magic here..
So, an 'ideal' diode is exactly what you do not want..
Perhaps someone can emulate this in Spice orsomething and
let us know!
The 'ring modulator' in the MS20 I think is merely an XOR
logic gate, which certainly gives a shitload of harmonics
and costs virtually nothing, but isn't suitable for processing
external sounds (prob. why you can't get at it, unlike the
excellent ringmod in the Arp2600).

paul perry melbourne australia