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;)Oh, you mean die "Die strasse kacke, ja.:lol5:Quote:
Originally Posted by DreadedHermie
I did forget.
Vell, it's like the gameshow host told Mrs. Presskey from Pine Barren N.J. when she said;
"But, this is a just a bag of shit!"
Ja, aber sie ist "really great shit, Mrs Presskey"
Gotta assume that it was, else why bother? :D
Note;
On da Islands, most street weed is from WW seed.
So there!:fish:
Aloha
Weeze
Here's one way to hook these up:Quote:
Also found a 12V. 21A. supply and a couple 12V. 8A. dimmers dirt cheap.
Leds tested well.
Got 5 that eat 1.2A @ 10.5V.
4 @ 10.4V and 1 @ 10.3V.
The 12 Volt power supply can deliver 21 Amps of current, which is a buttload. (bL) (sorry, kidding)
If you hook up the 8 Amp dimmers in parallel and run the 12V supply into them, they'll share the available current (up to 10.5 Amps each). So, the power supply has adequate headroom to push these 2 dimmers.
One dimmer's easy: dial it down where it only puts out 10.5 Volts. Wire the 5 leds that draw 1.2 Amps (1200mA) at 10.5 volts in parallel, and connect to the output of the dimmer. 5 leds each drawing 1.2 Amps = 6.0 Amps, and the dimmer's capable of handling 8 Amps, so we're good.
N.B.: Weezard and I like running the 1.5A leds at only 1.2A. They're more efficient that way, and gives a little margin of safety.
Wiring the other 5 leds gives us some options, but still easy enough....
The one led that only needs 10.3 volts to draw its 1.2 amps is a minor "current hog." If we were to feed it the same 10.5 Volts we sent to the first 5 leds, the dang thing might pull enough current to blow it, or at least make it run hot enough that the efficiency goes down. (Leds produce LESS light when they run too hot, and this is why we're interested. And the hotter they get, the more current they might pull. It's a vicious cycle, and anti-productive.)
So we want to feed the 10.3 Volt led with no more that that: 10.3 Volts.
One option is to set the second dimmer at 10.3 Volts. The one led will draw its 1.2 Amps at that voltage, The leds that needed 10.4 volts to pull the full 1.2 Amps will draw somewhat less at 10.3V; probably ~1.1 Amps. Big deal --4 of the leds are running just a tad cooler.
A more "aggressive" approach would be to run the second dimmer at 10.4 Volts, matching the 4 leds. But that's gonna push "Mr. 10.3V" past our 1.2 Amp target.
Solution? protect it with a resistor.
Value? Ohm's Law. R=E/I
R = .1V / 1.2A, or .08 Ohms.
That's such a small value (~.1 Ohm) you might have trouble finding it. That resistor was just gonna waste our power by turning it into heat anyway....
So you could check Mr. 10.3V and see just how much he pulls at 10.4V. If he only wants, say, 1.3A, you could run him nekked with the 10.4's if you're feeling daring.
Or, run them all at 10.3 and let the 10.4's loaf a little.
So, until you measure each led and see what it actually draws, you don't know what your best option is. Led's are grouped in ranges of Vf, wavelength, output, etc. called "bins". For how high-tech they seem, they are inconsistent. So you have to measure, but the rules stay the same.
Be interested to see how Weezard is planning to use these. What I outlined above is just an example; quick and dirty. Having some kind of current regulation would be nice.
And my head hurts. This math stuff is too boring on its own. Weezard's approach is mo' bettah. :jointsmile:
Just reread my post above. What a snore-fest. I suck at tech writing, and I think I may have damaged part of my brain attempting it just now. :madnoel:
Nein, nicht so sehr. Best I could find, been outta the game for a decade or three. But I do enjoy gardening. My favorite sport, next to chess and wife-beating. :pimp:Quote:
Ja, aber sie ist "really great shit, Mrs Presskey"
Gotta assume that it was, else why bother?
Well, aren't we just so special... (use Church Lady voice ;) ) I suppose ya'll refresh in bathtubs of Dutch beer, and all the ladies are gorgeous and willing.Quote:
Note;
On da Islands, most street weed is from WW seed.
(Roun' heanh' takes 'bout thitty-too of 'em to make up a full setta teef. An' dey so fat, the backa dey neck look like a package of hot dogs. :D)
And most street weed around here (truly the sphincter of the CONUS) resembles an oregano / thyme hybrid at best. :wtf:
Fortunately, it responds well to :weedpoke:
:lol5:
Set up a temporary mail drop, and I'll send ya some seed wif a full set o teef, bro.Quote:
Originally Posted by DreadedHermie
Least I can do for my personal 'splainer.:D
Heatsink arrived!:cool:
I'm in polishing mode for a while.
Gotta nip on over to da lounge and start a special thread now.
"Calling out to DreadedHermie for a game of Stoner Chess"
http://boards.cannabis.com/games-arc...ml#post1976275
Wee Zard
Great thread guys:thumbsup:
Quick question I read that you were using LEDEngin led's are their any other ones or what freq you using?
We were, but the cheap sources are drying-up and I can't afford Mouser's prices for the 660 nm.:(Quote:
Originally Posted by voodoojnky
Still waiting for horses.
Went looking for my themal epoxy.
Came up dry.
I WILL find it.
Calling on past experience, I ordered more.
That always works.:D
New build should commence within the week.
Thank's for askin' V.J.
Regards,
Weezard.
Got the honkin' big heatsink polished and ready.
100 sq. in. w 1.5" fins.
[attachment=o215395].
Now awaiting a slow boat from china.
<sigh>
If I was a good waiter, I'd get a lot more tips.
Impatient Weeze
Oh, you sneaky bastid, you! Where've you bin hidin dat beauty? Kiddin u no.
:stoned: Homey
I alla time kiddin' us.Quote:
Originally Posted by DreadedHermie
Comes wit da lolo.
Dis one was used, but got tossed in a dustbin wit some scratchy trash.
Got it for a song.
Out-bid a miser.:D
She were one fugly hunka, 'pon her arrival.
Did a high-school makeover da easy way.
Li'l sandpaper, li'l steel wool, very li'l elbow grease.
(I runnin' low on dat)
Den some rubbing compound an' a ginormous buffer!
Back inna day, I woulda gone all guage-block on 'er ass.
Da leds den be stuck-on through molecular adhesion.
No mo' dat. Older n wiser, ya?
Now, half-assed be jus' fine.
We smear on da goop fo' to fill in da tiny scratches.
Your 'sink guy is toolin' up some 11"- 12" wide, all you can eat sinks in a while.
I couldn't wait.
Maybe next time.
Da difficult?
We do dat straight away!
Da impossible?
Gonna take perhaps a day.
Fo' all da naysayers?
Lemme hear ya say NAY!
O. K.
While wait fo' horses, I go play.
Back inna Hi whyan minute.
Wee Zard
What about removing leds?Quote:
Back inna day, I woulda gone all guage-block on 'er ass.
Da leds den be stuck-on through molecular adhesion.
That freakin' epoxy is about 100 times stronger than it needs to be for attaching leds. I've seen it suggested that freezing your assembled unit down to cryogenic levels, then judiciously applying a small, water-backed charge of high explosive "might" help you get 'em off. :D All I want is that they don't leap off the light to a fiery death. I have too much blood on my hands already. ;)
Also saw it suggested to mix thermal grease in with the epoxy to weaken the bond. That just seems wrong. Like pouring beer into a Manhattan.
I'm thinking of deliberately mis-mixing the epoxy. The thermal conductance shouldn't be much different. (?) Thinkin' of practicing with washers / pennies / etc. when I get a spare ms. Have you tried this already?