[sdiy] Triple Lockhart cascade (while we're on the subject of waveshaping...)

[Dan Snazelle]

wow

this circuit seems pretty easy to build too

what do i need to feed it with and at what amplitude?

if i have time today(if the baby quiets down long enough) I will build it for sure

thanks



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----------------------------------------
> From: lanterma at ece.gatech.edu
> To: synth-diy at dropmix.xs4all.nl
> Date: Wed, 3 Jun 2009 02:16:05 -0400
> Subject: [sdiy] Triple Lockhart cascade (while we're on the subject of waveshaping...)
>
> I got curious what would happen if you cascaded a few of these. Here
> is what LT spice says:
>
> users.ece.gatech.edu/~lanterma/triple_lockhart.png
>
> Output of 1st stage is green, second stage is deep blue, output of
> third stage is light blue.
>
> I picked the 30K/10K ratios of the first two inverting op amp stages
> to get a gain of 3; Ken's website said the Lockhart folder wants a +/-
> 1.2V signal and gives out a +/- 0.4 V signal. That's how I got the
> number of 3. I boosted the feedback resistor of the last stage by 5 so
> it would look more like a usable output signal, but I don't show the
> output of that (it's just a gain).
>
> I didn't get what I expected. One Lockhart stage gives one fold. But
> two gives four, and three gives... whoa, 13!!! How is that happening?
>
> Someone wanna breadboard this up and tell me how it sounds? :)
>
> Here's the LT Spice file if anyone wants to play around with it:
>
> users.ece.gatech.edu/~lanterma/lockhart3.asc
>
> - Aaron
>
> P.S. I found that the Lockhart stage needs to see that 10K impedance
> at the output of the transistor stage to work right. If you don't
> include it, and you have it feeding infinite impedance, then the
> wavefold happens essentially instantly once you get to either side of
> ground.
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