[sdiy] trying to get my scope to see CHAOS??

[Dan Snazelle]

ok..... I was thrown off because in a previous comment Ian had suggested I run the jerkster at lower rates to achieve the best results for chaotic behavior.

oddly
the scope seems to work best with the Z and X outs


I am wondering if possible i switched the labeling of the Z and Y.

would this make a huge difference Ian?


there is still a lot i am trying to learn about these strange and beautiful modules



thanks guys







--------------------------------------------
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> Date: Sun, 22 Mar 2009 00:03:41 -0700
> From: dlmanley at sonic.net
> To: subjectivity at hotmail.com
> CC: synth-diy at dropmix.xs4all.nl
> Subject: Re: [sdiy] trying to get my scope to see CHAOS??
>
> Dan Snazelle wrote:
>> this is mainly a question I think Ian (the creator of the module I am using right now) might be able to answer, BUT just on the chance somebody else is checking the list at this hour, i figured i'd throw it out here.
>>
>> I REALLY want to get the kind of results from the jerkster that ian is getting in these scope shots:
>>
>> http://home.comcast.net/~ijfritz/ch_cir2.htm
>>
>>
>> SO...i connected X to channel A of my scope. And Y to channel B.
>>
>> I put my scope in the right mode....all i get is a square, or a dot that moves in an very strange trace...like it is slowly drawing something out with the dot...sometimes a loop. i wonder if Ian has a special scope that allows the path of the dot to STAY on the screen as it traces out the weird shape?
>>
> If the dot is slowly drawing something, it sounds like everything is
> working properly, but the chaotic input signals are just changing slowly.
>
> Put the scope into normal sweep mode, and look at either signal. How
> slowly are they changing? Adjust the rate of the Jerkster's outputs so
> that it is oscillating (or more correctly, chaotically varying)
> quickly. I don't know what the max rate at which the Jerkster will
> 'oscillate'. Set the gain on each input channel so that the signal
> amplitude fills the screen. Then switch back to XY mode. Does it look
> better? You may need to play with the gain and offset for each channel
> to center the figure. This may not be the way you want to use the
> circuit for audio/synth use, but is better for pretty XY-mode pictures.
> You want the time for the circuit to complete an 'orbit' to be fast with
> regard to the persistence of the scope, or another method would be to
> use a camera with a long exposure time.
>
> Also, to answer your other question, some scopes have an 'infinite
> persistence' mode where the trace doesn't fade until you clear it. This
> mode works better on modern digital scopes than it ever did even on the
> best, old Tektronix analog scopes.
>
> -Dave