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Old 07-20-2010, 03:50 AM #33
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Default Re: Direct-Drive 445 Host

DC batteries can spike, but with regular use I don't think they would as much.

On a small sidenote, where are you finding these 5A and 9A drivers? I have a custom one off host for my phlat red LED that I'm going to throw together, but I need a driver.


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Old 07-20-2010, 03:57 AM #34
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by Pontiacg5 View Post
DC batteries can spike, but with regular use I don't think they would as much.

On a small sidenote, where are you finding these 5A and 9A drivers? I have a custom one off host for my phlat red LED that I'm going to throw together, but I need a driver.
It's not a voltage spike. That's not going to happen with a battery. Excessive inrush current would be the problem.
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Old 07-20-2010, 04:21 AM #35
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Default Re: Direct-Drive 445 Host

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Originally Posted by LarryDFW View Post
Wally;

As long as you have a good heatsink,

the diode will be fine.

I've checked a couple of diodes, and both of them were fine for direct drive.

LarryDFW

P.S. No voltage spikes from a DC battery.
I may just give it a try tomorrow. I've got three 445nm diodes, and even if I ruin one they're only going to get cheaper to replace, I guess.
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Old 07-20-2010, 04:25 AM #36
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Default Re: Direct-Drive 445 Host

Not by much until projector prices come down. At the cheapest i've seen a130's, the per diode cost has been $31.something. (don't remember the projector price anymore) Plus something for the time and trouble of extracting them, $35 is the cheapest they'll be.
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Old 07-20-2010, 04:34 AM #37
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by qumefox View Post
Not by much until projector prices come down. At the cheapest i've seen a130's, the per diode cost has been $31.something. (don't remember the projector price anymore) Plus something for the time and trouble of extracting them, $35 is the cheapest they'll be.
Yeah, $35 is a pretty awesome price. They were $50 when I got these and I had to wait on a group buy.
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Old 07-20-2010, 04:40 AM #38
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Default Re: Direct-Drive 445 Host

I've seen them for $35 in the BST section. Not sure if those threads are still open and taking orders though.
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Old 07-20-2010, 04:49 AM #39
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Default Re: Direct-Drive 445 Host

I may regret it but I'll try it considering that your battery gives 600ma and people have run their diodes at 1.5-2A. I have a 2 ohm and a 20 ohm resistor that I'll use with it.
That just leaves heat sinking and collimating.
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Old 07-20-2010, 05:13 AM #40
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Default Re: Direct-Drive 445 Host

Well, I just joined the Direct Drive Club, and so far it's good.
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Old 07-20-2010, 05:25 AM #41
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Default Re: Direct-Drive 445 Host

Quote:
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Well, I just joined the Direct Drive Club, and so far it's good.
Can you put a 1 ohm resister in series with it and see what current it's really pulling?
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Old 07-20-2010, 05:29 AM #42
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Default Re: Direct-Drive 445 Host

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Can you put a 1 ohm resister in series with it and see what current it's really pulling?
Why bother with a resistor, just read the current draw off the batteries. Since its direct drive you know exactly what the diode is getting.
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Old 07-20-2010, 09:08 PM #43
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Default Re: Direct-Drive 445 Host

Something's not right because with a 2 ohm resistor in place my diode pulls nearly 780ma of current but it's not as bright as I expected. I suspect that the voltage may be lower than it should be. I know that a 300mw IR diode will quickly burn holes in electrical tape at extremely close range even when uncollimated but with the same resistor and an extra AA battery this one doesn't give enough light to heat anything. Meh I'll figure it out given enough time.
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If you're bicycling backwards up a hill at a downwards
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The formula for finding the answer to any impossible question is onion-banana juice divided by the square root of infinity.

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Old 07-20-2010, 09:19 PM #44
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by psi seeker 34 View Post
Something's not right because with a 2 ohm resistor in place my diode pulls nearly 780ma of current but it's not as bright as I expected. I suspect that the voltage may be lower than it should be. I know that a 300mw IR diode will quickly burn holes in electrical tape at extremely close range even when uncollimated but with the same resistor and an extra AA battery this one doesn't give enough light to heat anything. Meh I'll figure it out given enough time.
How many batteries are you using, and what type are they?
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Old 07-20-2010, 11:04 PM #45
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Default Re: Direct-Drive 445 Host

I'm using 3 Ni-MH rechargeable AA batterys.
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If you're bicycling backwards up a hill at a downwards
speed of -37 miles per hour and it begins raining maple syrup how many pancakes does it take to shingle a dog house? Answer: onion-banana juice!

The formula for finding the answer to any impossible question is onion-banana juice divided by the square root of infinity.

Note safety features --->

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Old 07-24-2010, 04:46 PM #46
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Default Re: Direct-Drive 445 Host

psi seeker 34;

Remember that diode voltage matches up well with:

1. A 4.2VDC Lithium-ion battery
(the newest ones I have operate @ 4.35 VDC)
2. Three 1.5 VDC batteries with a small value resistor
(try a 0.47 ohm to test current)

Remember, that you must have a good heat sink for any direct-drive system.

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Old 07-26-2010, 04:07 AM #47
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Default Re: Direct-Drive 445 Host

My resistor is 2 ohm which is the lowest I could find in my pile of electronic scrap.
If I want to go any lower I'll salvage a potentiometer to do the job so I don't have to keep soldering and unsoldering resistors to get the right one.
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Notes to self:
If you're bicycling backwards up a hill at a downwards
speed of -37 miles per hour and it begins raining maple syrup how many pancakes does it take to shingle a dog house? Answer: onion-banana juice!

The formula for finding the answer to any impossible question is onion-banana juice divided by the square root of infinity.

Note safety features --->

If you don't understand the above ask jack sparrow.

Last edited by psi seeker 34; 07-26-2010 at 04:10 AM.
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Old 07-26-2010, 04:16 AM #48
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Default Re: Direct-Drive 445 Host

Quote:
Originally Posted by psi seeker 34 View Post
My resistor is 2 ohm which is the lowest I could find in my pile of electronic scrap.
If I want to go any lower I'll salvage a potentiometer to do the job so I don't have to keep soldering and unsoldering resistors to get the right one.
Or you could use a couple resistors is parallel to get a lower resistance value. The equation for the overall resistance is Rtotal=1/(1/R1 + 1/R2 + 1/R3 + etc...)
You can also use an online resistor calculator instead for the calculation such as this one.

Last edited by laser_freak; 07-28-2010 at 09:23 PM.
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