On 2022-04-24 7:45 p.m., Mac Doktor wrote:
>> On Apr 24, 2022, at 6:10 PM, 'John Rehwinkel' via neonixie-l
>>> I'd *really* like to know what frequency ratios of oscillators B and
>>> C create static or cycling patterns (A & D produce a lissajous figure
>>> baseline)). My idea is to use something like an Arduino with some
>>> rotary encoders that jump between ideal frequencies.
>> Not high frequency at all, that project was from 1975. Oscillator A
>> is 60Hz, oscillator B is variable from 60-240Hz, oscillator C is
>> variable from 300-3000Hz, and oscillator D is variable from 30-300Hz.
> True but we're dealing with square waves here. Doing this digitally
> (which I am very interested in) requires a decent sampling rate to keep
> the corners sharp, which is a large part of the appeal of this analog
> version. Having tried it with a laser and some galvos I can tell you
> that good bandwidth makes a big difference. And that's as much as I know
> about it. I'm here to learn from you guys.
I've been working on a vector generator. The first iteration is about
20k vectors/second but supports lines and points only (no circle
segments or anything fancy yet). Just finished routing the PCB.
It should be usable with most dev boards that use Arduino Uno pinout
(3.3v or 5v). I have been testing with NXP Freedom KE06Z but I expect to
port the code to Duemilanove and STM32 Nucleo G474RE at least.
Sample output: https://imgur.com/a/fZfqSmG
>> I've been using a Teensy board, that processor has a pair of built-in
>> DACs, so it wasn't hard to have the old scopes display their own names.
> 8 bit DACs? Tell me more.
> Terry Bowman, KA4HJH
> "The Mac Doctor"
> “...the book said something astonishing, a very big thought. The stars,
> it said, were suns but very far away. The Sun was a star but close
> up.”—Carl Sagan, "The Backbone Of Night",/Cosmos/, 1980
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