Looking for exciter schematics

[terry michaels]

Message text written by "The Dark force of dance"
>This all sounds more plausible. At the time I tried to reverse engineer
the
>box I had no clue as to how these things work. Which always makes things
>harder to understand. The thing that stumped me was that the amplitude
>control of the 13600, IE: Iabc, was derived directly through a resistor
>from it's input. At which point I threw my hands up and said. "Nar this is
>the OTA for distortion. I don't know if anyone has noticed but an LM13600
>in just the _Wrong_ configuration makes one wicked distortion unit.

>I don't know exactly but it could also stand to reason that it provides
>some sort of cross modulation circuit. Unfortunately all these things crop
>up at just the wrong time for me. Bogged down as I am at the moment in a
>VGA system that won't. But I've downloaded some of the patent information
>and will chew threw it at my earliest possible time. I also want to look
>into how they do their bass enhancement as well.

>Thanks y'all and I look forward to your re-drawn enhancer circuit Jules.

Batz:

If Iabc is connected to its input, the LM13600 is multiplying the input by
itself, and is acting as a squaring circuit.  Squaring a sine wave doubles
its frequency.   Maybe this is the underlying principle behind the
"Exciter".

Terry