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Igor
modified 9 years ago

Aurora borealis

30
11
656
08:30:56
I took plasma field circuit by @RodjerX and simplified it a bit for clarity. Each LED is connected between two transmission lines, at different points along the lines. The lines are fed by two pulse sources with different periods, which creates random glow. Do you see any difficulty building this?
published 9 years ago
rbrtkurtz
9 years ago
I don't see any particular difficulties. This would look neat under a piece of plastic or something to make a diffused glow. What do you plan to use as the square wave sources?
Igor
9 years ago
I could use a comparator based oscillator or 555 timer. What would you suggest?
rbrtkurtz
9 years ago
I'd probably go with a comparator setup. Only because I'm more comfortable with them, personally. I'm not sure how the effect would look at that high of frequencies, though. So whatever I did, I'd make it with adjustable period and duty cycle. That way I could play with it until I got a visual result that I liked. I'd possibly even use an arduino for testing.
Igor
9 years ago
Got it, thanks. I will also have to adjust LC to make it resonate slowly enough. Those may have to be huge values though...
rbrtkurtz
9 years ago
Plus, I know things will vary depending on the exact values of the LEDs you actually end up using, but in the circuit, there's one part of the cycle where all four bottom LEDs are going to be seeing good amount of current. However, I also know that if you just increase the resistor values, then the whole thing will be less bright. I guess just find out what the values will be for the LEDs your want to use, and make sure they won't be getting to much current at any point. Also, you could probably get away with using 9V for both square waves to make things a little easier. That's my two cents anyhow. Looks fun!
rbrtkurtz
9 years ago
Yeah, you might want to buy a mixed bag of chokes and caps. Or get everything weighed out in EC first. ;)
Igor
9 years ago
That's what EC's for :) Thanks!
Voltransistor
9 years ago
Cool. :-) It does look like the northern lights. Nice job!
rbrtkurtz
9 years ago
*worked out
MichelSilva
6 years ago
Congratulations
nazar15t
2 years ago
Super

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