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Old 11-03-2008, 07:09 PM #673
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Quote:
Originally Posted by amkdeath
I spent the past 4 hours designing and building my "dual-laze"/

a 6x and an open can all in one plastic square, powered by one 9v and 2 AMC7135's.
How did you power an AMC from a 9V? My datasheet says absolute maximum voltage = 7V. But normally it should not be more than 6, so it's not really suitable.

Did you calculate the bypass resistor for the 4x? 40 ohms to bypass 150mA at 6V? I don't think the AMC is stable enough for pushing diodes above their limits. It's OK for higher power diodes, where the small current swing won't matter.


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Old 11-03-2008, 10:41 PM #674
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Quote:
Originally Posted by IgorT
[quote author=amkdeath link=1223438970/660#660 date=1225671155]I spent the past 4 hours designing and building my "dual-laze"/

a 6x and an open can all in one plastic square, powered by one 9v and 2 AMC7135's.
How did you power an AMC from a 9V? My datasheet says absolute maximum voltage = 7V. But normally it should not be more than 6, so it's not really suitable.

Did you calculate the bypass resistor for the 4x? 40 ohms to bypass 150mA at 6V? I don't think the AMC is stable enough for pushing diodes above their limits. It's OK for higher power diodes, where the small current swing won't matter.[/quote]


33ohm resistor in parallel with the 4x diode and an AMC7135 with 9v in = about 200mA and 200mW. For the open can i have just the AMC + red diode. It works fine, I know it is a little too much, but I did not have space for 2 14500's

meh it works, I just need another red diode now... *:-/

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Old 11-04-2008, 12:02 AM #675
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

A 33 ohm resistor with an AMC powering a 4x gives you 168mA. It varies a little with input voltage and how much current gets bypassed depends on the Vf of he diode at the remaining current. They depend on each other, and the only way to do it safelly is to power the diode fom a proper driver at the desired current, measure the actual output from the AMC, then divide the diode's measured Vf by the current you want to bypass. However i would recommend you bypass 20mA more, just in case, which you did...

Basically you just use Ohm's law. U = R x I..
You want to bypass 150-180mA, to power the diode at 200mA. AMCs vary from 350-380mA!
Then you put the diode on a 317 or a FlexDrive set to 200mA and measure the voltage across it. Let's say you get 6V at 200mA (Rkcstr's gaph says so)
Then you do this: U = R x I -> R = U / I -> R = 6/0.150 (6V divided by 150mA) -> R = 40 ohms

If the AMC puts out EXACTLY 350mA, 40 ohms will give you 200mA current through the diode. But then it will warm up, the Vf will drop and the relationship changes. It's actually very complicated. You could only match it up perfectly using two graphs.

Since you used 33 ohms, (which would bypass 91mA at 3V / with a red diode - is that where you got it?), it bypasses 182mA at 6V, you got a safer current of 168mA through the diode, IF your particular AMC puts out 350 and not 380. If it puts out 380mA, you got 198mA through the diode.

Unfortunatelly the AMC also changes in current with input voltage - the lower the input voltage, the higher the output current for some reason.


Otherwise, you do need output caps on the AMC. The AMC original board doesn't work with output caps, because of the polarity protection. Bridge the protection and you can put a capacitor on the diode directly. If the original polarity protection remains in tact, it doesn't want to start up for some reason, altho it should. But it has something to do with the AMC positive input being at a lower potential than the diode. They should be at the same potential anyway.


In any case, AMC can be a good driver for higher power diodes, where small current changes don't matter. It can be OK for reds, that can either take the current, like open cans, or reds, that you set a little lower than max current.

But it's not good for pushing expensive diodes to their limits. It's not stable enough for that.....
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Old 11-04-2008, 01:10 AM #676
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

OK, this might be a stupid question, but I don't want to read 36 pages of this thread... no flaming please. I did read the first several posts on the first page.

Is there a sign up going on for "round three"? and If so, what is the estimated time of getting these sleds (days, weeks, months)?

I'd like to have 2 of the 6x blu-ray sleds.
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Old 11-04-2008, 01:28 AM #677
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

theres batch 3 list up on page one, just scroll along down to the bottom.







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Old 11-04-2008, 01:35 AM #678
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Quote:
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theres batch 3 list up on page one, just scroll along down to the bottom.


Tommy

Thanks!!

Put me down for two!
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Old 11-04-2008, 01:41 AM #679
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

AMK:

I was on original list and would still like 1 sled in Batch 3.
Payment sent.

thanks!

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Old 11-04-2008, 01:51 AM #680
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I was sick of waiting for my flexdrive to come so I hooked up my 4x to 167mA. Here's a pic of the awesome color, sorry about the quality, I had to use my cell to bring out the color. It burns nicely.
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Old 11-04-2008, 03:05 PM #681
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Got mine today! *
A big thank you amkdeath [smiley=dankk2.gif]
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Old 11-04-2008, 04:31 PM #682
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

I dont have time to read through 35 pages of posts... lol (I am in class - Strategic Management... haha) is round 3 still active enough if I jump in to purchase 2 or 3 of these?
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Old 11-04-2008, 05:08 PM #683
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Got mine
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Old 11-04-2008, 08:30 PM #684
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

i just got my 6x done
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Old 11-04-2008, 09:00 PM #685
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

What current/power, Jake?
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Old 11-04-2008, 09:02 PM #686
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

200ma with a rkcstr driver, and runs good, i tested it for 1 min on and seams fine *
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Old 11-04-2008, 09:19 PM #687
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

i have decided to do my next test at 150ma and see where it goes. if it lasts then i think i may just leave it and run it in my projector and then possibly test my other at 180ma fr the good of knowledge!

also does anyone know a good cw rating for the closed can reds in these sleds. i may just use two of these in my projector if i like them enough.
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Old 11-04-2008, 09:37 PM #688
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Default Re: 6x Blu-ray SLEDS GB! THEY ARE GOING FAST!

Quote:
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I was sick of waiting for my flexdrive to come so I hooked up my 4x to 167mA. Here's a pic of the awesome color, sorry about the quality, I had to use my cell to bring out the color. It burns nicely.
Glad to to see you got your 4x working. I practiced on the IR diode and I think I found a really good way to remove the diode with any visable damage. I still have not touched the red or BR diode though.

--hydro15
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