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Old 09-09-2013, 01:04 PM #1
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Default Current Problems on 9mm diode and 2.4A driver

Hey Guys,

I bought 2x9mm 445 packages from DTR with a 2.4A x-drive driver. I didn't verify the output of either driver.

Now I built the laser, and heatsinked the driver very well.

Turn on the laser and LPM it, only 1.9W.

So I measure the current at the cap, and only get 1.8A

So last resort different batteries, and this is where it got strange.
Using these fully charged batteries :
Panasonic Super Max 3.7V 3400mAh Rechargeable Li-ion Battery - Black + Green (2 Pieces)
I got 1.8A

Genuine SANYO 18650 3.7V 2600mAh Rechargeable Battery - Red (Pair) - Free Shipping - DealExtreme gives me 1.9A

and my generic trustfire give me 2.0A.

To note, I bought 2x9mm packages and have built two hosts in parallel, both exhibit the same problem. The hosts are the same.

The only thing I can think of is the custom host's "screw" making contact between the battery and the circuit, has too high a resistance. Before I take it apart I'd like to get some input from you guys.


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Old 09-09-2013, 01:40 PM #2
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Default Re: Current Problems on 9mm diode and 2.4A driver

Looks like it could be anything, taking apart is probably a better idea just do some double checks step by step, as if you are rebuilding from scratch.. Some pics would also help us if you donot want to open it up. We do need to know how drivers are mounted and the leads are connected properly.

The resistance can be the issue, You may need to send it to a local member/builder/vet like ARG he's pretty good, I believe these are not batteries that are the issue, Some photos of your setup would give a slightly better idea where to start looking..
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Old 09-09-2013, 01:47 PM #3
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Default Re: Current Problems on 9mm diode and 2.4A driver

x-drive? I think it's a buck driver meaning it steps the voltage down from two cells to what the diode needs and reducing the amps drawn from the batteries in the process.
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Old 09-09-2013, 03:29 PM #4
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Default Re: Current Problems on 9mm diode and 2.4A driver

^^^ like he said. Did you use two 3.7V li-ion cells for the lasers ? These buck drivers needs two cell instead of one cell.
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Old 09-09-2013, 04:21 PM #5
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Default Re: Current Problems on 9mm diode and 2.4A driver

When you say you measured the current at the cap does this mean that you measured the current draw from the tailcap? If so then your readings for the tailcap current draw may be correct, since buck drivers tend to draw less current than they are actually supplying to the diode.

As said above make sure you're using two li-ion cells since buck drivers require the total voltage from two 3.7 volt batteries to run properly.

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Old 09-09-2013, 04:38 PM #6
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Default Re: Current Problems on 9mm diode and 2.4A driver

It IS weird though that you're only getting 1.9W out. Don't think I have ever seen a 9mm that is that inefficient.
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Old 09-09-2013, 04:45 PM #7
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Default Re: Current Problems on 9mm diode and 2.4A driver

Do you mean 2.3A drivers? I don't have a 2.4A option.

Also what lens are you using? If you are using a three element lens you are probably right on it.

If it is drawing 1.8A and you are using two Li-ions the current is probably correct at 2.3A to the diode since buck drivers turn extra voltage into current and that is about what they draw with two fully charged Li-ions @ 2.3A to the diode.

Last edited by DTR; 09-09-2013 at 04:48 PM.
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Old 09-10-2013, 12:41 AM #8
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Default Re: Current Problems on 9mm diode and 2.4A driver

My mistake... it is a 2.3A driver.

I am running it on two of the previously mentioned cells.

When measuring at the cap, I remove the cap, and complete the circuit by putting my ammeter in series with battery to body of host.

The driver/laser/batteries seem to have a warmup period. Current draw as mentioned above starts at 2.0A and in about 30 seconds goes up to 2.2A.. those numbers check out then. My LPM only goes up to 2W so perhaps it was reading wrong at the higher range.

I took the head out and ruled out the switch, so all these numbers check out! Thanks guys, false alarm!Current Problems on 9mm diode and 2.4A driver-img_2226.jpg
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Old 09-10-2013, 12:49 AM #9
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Default Re: Current Problems on 9mm diode and 2.4A driver

What lens did you get with the units?

Last edited by DTR; 09-10-2013 at 12:49 AM.
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Old 09-10-2013, 01:00 AM #10
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Default Re: Current Problems on 9mm diode and 2.4A driver

Stock lens.
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Old 09-10-2013, 01:10 AM #11
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Default Re: Current Problems on 9mm diode and 2.4A driver

Ok so you extracted the stock lenses and mounted them in lens holders. Everything went well in the extraction and they came out nice and clean?
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Old 09-10-2013, 01:23 AM #12
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Default Re: Current Problems on 9mm diode and 2.4A driver

Sorry today's been a long day. I got the 117 dollar option from your site and using it as is.
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Old 09-10-2013, 01:26 AM #13
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Default Re: Current Problems on 9mm diode and 2.4A driver

Oh then you never took the acrylic's out. You will need to ditch them. YOu can either get lens barrels for the stock lenses that were in the package, get some G-2's or get three element glass lenses. All I can say is you really need to ditch the acrylic's they are just there to keep the dust out.
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Old 09-10-2013, 01:29 AM #14
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Default Re: Current Problems on 9mm diode and 2.4A driver

Thats... what that is... OK. Order coming up!
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Old 09-10-2013, 01:31 AM #15
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Default Re: Current Problems on 9mm diode and 2.4A driver

No problem. If you are going to get the lens barrels and do the stock lens option see this thread for details.
New 9mm 445 diodes
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