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Old 10-15-2010, 10:50 AM #1
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Default Groove 2 drivers: in parallel?

Hi y'all.

I want to get 1A or thereabouts from a Groove 2 driver. The datasheet says 500mA is the max.

I'm sure I read something about being able to run drivers in parallel to double the current, but I can't seem to find it any more.

Can it be done with the Groove 2 and if so are there any things to watch out for?

I could have used a Flexmod but there isn't the space in this build.

Cheers


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Old 10-15-2010, 04:50 PM #2
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Default Re: Groove 2 drivers: in parallel?

Just use a Microboost. The Flexdrives are in stock now too.
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Old 10-15-2010, 04:58 PM #3
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Default Re: Groove 2 drivers: in parallel?

Yep if you are looking for 1A then Microboost or the Flexdrive is the way to go. The thread you are talking about was for running Microboost drives in parallel. I am not sure that would work with the groove.

I believe this is the thread you were looking for.

parallel drivers
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Old 10-15-2010, 05:45 PM #4
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Default Re: Groove 2 drivers: in parallel?

Thanks guys. Unfortunately I've got 8.4 volts, which is too many for a MicroBoost or FlexDrive unless I drop the volts with a bunch of 1N4001s, but isn't that very inefficient?

8.4v is perfect for a Groove, but for the current.

I'll PM drlava and see what he says about paralleling the Grooves.

I may have to try and squeeze in a FlexMod after all.
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Old 10-15-2010, 06:04 PM #5
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Default Re: Groove 2 drivers: in parallel?

Quote:
Originally Posted by micksterbs View Post
Thanks guys. Unfortunately I've got 8.4 volts, which is too many for a MicroBoost or FlexDrive unless I drop the volts with a bunch of 1N4001s, but isn't that very inefficient?

8.4v is perfect for a Groove, but for the current.

I'll PM drlava and see what he says about paralleling the Grooves.

I may have to try and squeeze in a FlexMod after all.
You could try an LM317 or LM338 driver. They are linear drivers that can give over 1A of current.

Here are some related threads.
Drivers for 445

1500mA 445nm diode... use an LM317t or LM338t

How to set up the Flexmod P3 for a handheld laser
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Old 10-15-2010, 06:51 PM #6
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Default Re: Groove 2 drivers: in parallel?

You are right, two grooves would be a great drop-in for an 8.4V supply. However at 1A that little driver pair brick will need to dissipate 4W assuming you're running 445nm so you will need to heatink the black transistors if you want to have a decent runtime before thermal protection kicks in. Alternatively assuming you're using 18650 you could use one 18650 and a dummy battery and use a FlexDrive.
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Old 10-15-2010, 07:05 PM #7
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Default Re: Groove 2 drivers: in parallel?

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Originally Posted by DTR View Post
You could try an LM317 or LM338 driver. They are linear drivers that can give over 1A of current.
That's great, thanks. I've actually built some of these before but I've also blown some stuff up with them, and I like the safety features of the 'proper' drivers. Might be an option if I'm careful though.

Quote:
Originally Posted by drlava View Post
You are right, two grooves would be a great drop-in for an 8.4V supply. However at 1A that little driver pair brick will need to dissipate 4W assuming you're running 445nm so you will need to heatink the black transistors if you want to have a decent runtime before thermal protection kicks in. Alternatively assuming you're using 18650 you could use one 18650 and a dummy battery and use a FlexDrive.
It's actually 7 x 1.2v NiMh in series! I want the power capacity so I'm loathe to remove any of the batteries.

So it is possible to parallel them. Presumably the Grooves would only be dissipating the same W as a FlexMod if I was able to squeeze one of them in... but the FlexMod is way easier to heatsink.

Decisions, decisions.


Thanks again. I'll post an update once I've made some more progress.
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Old 10-15-2010, 07:34 PM #8
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Default Re: Groove 2 drivers: in parallel?

If you can fit a flexmod it is the best driver I have used. I have a few of them waiting on hosts. The power range is great and the LD protection is a must.

like drlava said in another thread there are cheaper drivers but if you loose a diode it will cost you more in the end.
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Old 10-16-2010, 12:28 AM #9
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Default Re: Groove 2 drivers: in parallel?

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I have a few of them waiting on hosts.
You must make the day of every seller here, LOL. I'm sure you're on Jayrobs Christmas card list.
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Old 10-16-2010, 01:53 AM #10
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Default Re: Groove 2 drivers: in parallel?

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You must make the day of every seller here, LOL. I'm sure you're on Jayrobs Christmas card list.
I better be.
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