Old 05-05-2011, 08:46 PM #1
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Default Question about 808nm ir build

HI,

I want to put a 250mw 808nm ir diode in an ordinary newwish pen.
My question is how do i have to connect diode with the driver and where i have to solder the spring.

Driver here:

LM358 Constant Current Laser Driver, 3.5 -5.0V - V2 | eBay


Or could I use this driver instead ?

808nm 100-500mw Laser Diode Driver Reverse Protection | eBay


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Old 05-05-2011, 09:04 PM #2
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Default Re: Question about 808nm ir build

1st driver doesn't look too bad, second one I wouldn't buy that.
Instead get a 7$ greenie pen, inside you will find a driver just like that or very similar.
Plus you get to keep the DPSS and host.

Solder each pin of the diode to the corresponding tab on the driver, be careful not to break the pins when you can't avoid to bend them..
Battery - to the spring, battery + to the diodes case.
The spring on the odicforce would go on the "switched V-", unless you'd want to use your own (external) switch.
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Old 05-07-2011, 09:07 AM #3
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Default Re: Question about 808nm ir build

Thanks. Now I want around 250mw from these common 5.6mm 300mw from ebay. Could you recommend a current setting ?
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Old 05-07-2011, 11:19 AM #4
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Default Re: Question about 808nm ir build

Quote:
Could you recommend a current setting ?
Without a LPM? No, sorry.
Somewhere between 200mA and 500mA would be my guess.
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Old 05-07-2011, 01:07 PM #5
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Default Re: Question about 808nm ir build

So is there anybody dealed with these diodes before ? I need advice please
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Old 05-08-2011, 06:05 PM #6
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Default Re: Question about 808nm ir build

Please help !
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Old 05-08-2011, 06:16 PM #7
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Default Re: Question about 808nm ir build

Try this, there is a graph for an IR diode, even if it is not the same, it should
give you a general idea of the efficiency and hence the input/output ratio.
http://laserpointerforums.com/f42/me...-ld-26417.html
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Old 05-08-2011, 07:14 PM #8
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Default Re: Question about 808nm ir build

Brand New 808nm 300mW Taiwan Laser Diode /DIY Laser/Lab | eBay

Diode i found. Description says <350ma. Is that realistic ?
Because I want around 200-250mw
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Old 05-09-2011, 02:28 PM #9
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Default Re: Question about 808nm ir build

know ?
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Old 05-09-2011, 02:39 PM #10
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Default Re: Question about 808nm ir build

Well if you have all the info about the diode, why not just use those values?
You can always up the current later on when you feel comfortable, you know
people here routinely drive all kinds of diodes at 150-200% of the suggested operating current.
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Old 05-09-2011, 02:41 PM #11
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Default Re: Question about 808nm ir build

The driver cannot handle current over 300ma
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Old 05-10-2011, 07:41 PM #12
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Default Re: Question about 808nm ir build

Quote:
Originally Posted by anselm View Post
Solder each pin of the diode to the corresponding tab on the driver, be careful not to break the pins when you can't avoid to bend them..
Battery - to the spring, battery + to the diodes case.
The spring on the odicforce would go on the "switched V-", unless you'd want to use your own (external) switch.
Just read the description again and it says the V+ input is already connected to the LD+ , so do I still have to solder a wire , or can I just bend the case pin to the LD+ ?
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Old 05-10-2011, 08:43 PM #13
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Default Re: Question about 808nm ir build

THIS may better explain my question
Attached Thumbnails
Question about 808nm ir build-laser.png  
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Old 05-10-2011, 10:27 PM #14
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Default Re: Question about 808nm ir build

OR something comletely different :P
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Old 05-13-2011, 07:56 PM #15
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Default Re: Question about 808nm ir build

I know I am impatient
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Old 05-13-2011, 08:16 PM #16
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Default Re: Question about 808nm ir build

I don't understand your drawing at all.
What driver are you using after all? The odic-force?
Well I never used one of those before so I can only guess.

Also, your picture looks wrong to me, because the case pin is the anode,
the pin conterclockwise form the case pin is the cathode, and the pin opposite
the cathode is unused....

Is this going to be a pointer or a labby.
I mean is it an issue in your case that the diodes case pin is positive?
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