> On Apr 24, 2022, at 6:10 PM, 'John Rehwinkel' via neonixie-l > <[email protected]> wrote: > >> 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 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" https://www.astarcloseup.com “...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 -- You received this message because you are subscribed to the Google Groups "neonixie-l" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web, visit https://groups.google.com/d/msgid/neonixie-l/F63C6D78-CE08-4103-ACD8-E274FCAA4288%40gmail.com.
