Moderators: Dave Moll, Andrew Davie, Steve Anderson
Klaas Robers wrote:Then the current for each LED can be say 10 mA peak white again, but for a white frame still 16A is needed from the PSU.
gary wrote:Oh a salvaged computer PSU...
Klaas Robers wrote:But then you will see the flicker very well. It would be better if you had a memory (capacitor) per pixel that will see that the LED keeps the required brightness the full 1/12.5 sec. Then you would have a flickerfree picture. However that implies 1540 capacitors and 1540 transistors and 1540 resistors besides the 1540 LEDs.
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Steve Anderson wrote:*I think wiring up 1500+ LEDs each with two pins actually is going to be 90% of the effort...let alone anything else in a similar quantity. But Grant did it!
Steve Anderson wrote:True, if you run this thing off 5V which should be possible, but if 12V a PC supply isn't quite up to it. But good suggestion.
Steve A.
harry dalek wrote:bell labs same sort of idea ...
harry dalek wrote:The commutator just switched all those lights in one row one long line so they just snaked zig zag the lights into a raster form how they wired it to the lights.
I don't mean make a rotating commutator but scan only in one direction and just zig zag the wiring to the leds so it would form a raster ?
gary wrote:The equivalent of this with (assuming 8 tap shift registers) would require at least 263 shift register chips if my calcs are correct...
Good point Harry, I sometimes forget the yanks had anything to do with the development of television
But they had a commutator segment for each lamp (so in Baird's case 2100 segments).
[/quote]The equivalent of this with (assuming 8 tap shift registers) would require at least 263 shift register chips if my calcs are correct...
gary wrote:Oh no Steve it depends on the PSU I have in front of me a mere 250W PSU and it's 12V is 14 amps - they get much bigger than that.
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