Oscilloscope clock. Title link takes you to the details on Retro Thing.
Wednesday, May 02, 2007
10 comments:
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MATRIXSYNTH - EVERYTHING SYNTH
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MATRIXSYNTH is supported by affiliate links that use cookies to track clickthroughs and sales. See the privacy policy for details.
MATRIXSYNTH - EVERYTHING SYNTH
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Where does the sound come out?
ReplyDeletewhen the tube flyback begins to fail it'll let out a wonderfully high-pitched whine. Just sample it.
ReplyDeleteholy god that's sexy
ReplyDeletevector graphics are even better than synthesizers!
Hot.
ReplyDeletewouldn't this be raster?
ReplyDeleteif it's XY, on an oscilloscope it would be Vector right?
ReplyDeleteThe PIC no doubt has a bunch of co-ordinates for the dial, and the clock. Depending on the time, it'll compute where the hands should be aimed at (just a few points), and then there will be a 'line drawing' function that takes two points and a time step to change the DAC outputs that feed the Oscilloscope.
If it was a raster, it would have to a) have RAM for the raster (plus raster scanning) and b) spend cycles 'drawing' the empty space. You don't see that hardware on the little board he has.
By going Vector, the PIC only needs to spend its cycles drawing what's actually there.
(I just sent him money for the last paypal pcb :)
i think Jan means 20mhz minimum, not 200mhz.
ReplyDeleteMost people don't have scopes that fast.
It apparently refreshes between 150Hz and 260Hz depending on how complex you want the dial (set via RS232).
ReplyDeleteyou are right df. my bad. I dug this up which helped me to understand:
ReplyDeletehttp://web.mit.edu/edmond/www/projects/pong.html
Doc, I said 200mhz, not 200hz.
ReplyDeleteWe're talking scope bandwidth, not scan rate.
A Tek475 scope (as shown) is a 200mhz bandwidth scope, but few people have scopes that fast. Most are 20mhz to 100mhz, at least for people into audio.