What would be the best distortion for aural exciter like harmonics?

[erikb1971]

looks like you have the same firewall at home now? 

[Mark Hammer]

The portion circled in green is what you want.  Instead of going to the 25k trimpot  the LED portion of the optoisolator would be connected to the junction of the 22uf cap and attack pot.  Quite possible that 22uf would be too large a value and introduce too much lag.  Consider 10uf.

As well, 51R might be too low for driving the LED, and risk passing too much current, so start out with the Attack pot at max resistance, and nudge it downwards gradually.

[erikb1971]

so... the combined harmonic sweetener an noise gate would look like this:



Cheers

Erik

[Mark Hammer]

Now that I can see it, the answer is "Almost, but not quite".

The LED part of your optoisolator simply goes to ground, more or less like the way the CLM6000 is used here, rather than tying it to the output of the exciter path: http://www.generalguitargadgets.com/diagrams/cabff_sc.gif

The LDR part does go where you put it, and you would probably want something like a 500k trimpot in parallel with that LDR so you could adjust what the max/min resistance would be.

Finally, the envelope follower should probably be tied to the output of IC1a, such that IC1a feeds the clean path, the exciter path and the sidechain/envelope-follower.  Connect the .01uf cap there directly, and stick a 22k fixed resistor and 47k variable resistor (trimpot) between the cap and the inverting (-) input of the op-amp.  That will vary the sensitivity over a sufficient range (48 to 150x).

[erikb1971]

"Almost, but not quite".

Story of my life! 

Small steps... but something like this?

[erikb1971]

eehhmmm.... Don't want to push but.... you still alive?

[Mark Hammer]

Quite.  Just too many things on the radar and some of them slip off.

Here is what you want:  http://img.photobucket.com/albums/v474/mhammer/Corrected.png

You were 99.9% of the way there.

[erikb1971]

Thanks mark... oohhhhhhhhhh I was close! final version: