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my first laser with a PHR-803T diode

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Warzon3

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ok so I'm gonna build my first laser using a PHR-803T diode.

I got the host coverd (with heatsink) but now I got some problems with the driver and battery's to use.

From what I can gather from this site I need about 9V input to make the everything work. It will be build using this schematic:


giving me a max current of about 125 mA

Am I right about all this? if yes then I can start building this part.

Now for the second question: What battery's can I use to power this? My host can hold 3 AAA battery's but I doubt if I can find those at higher voltages then 1.5V. I've seen other people power this diode with 2 14500's but that will only give 7.4 V total so how can this ever be enough to run a PHR-803T diode from? (I can probably modify the host battery holder to hold 2 AA's)

Thanks in advance Warzon3
 





Kookapeli

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Mines running perfectly on 2 14400's on a normal DDL driver running at 180mA. PHR 803t's needs around 5.5V and with 1.5V drop out on the driver that would be plenty.
 
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Warzon3

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you running it at 180mA? I heard PHR-803T diodes can take up to about 120mA.

Now that 'normal' DDL driver you mention is that without variable resistor? so if I were to use
the schematic below with a 10ohm resistor (and a diode and capacitor for protection) it should work on 2 14400's?
lm317tcurrentregulation.gif
 
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Warzon3

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ok thanks for the information. From what you tell me my laser should work on 2 14400's and the driver I placed in my first post?
 
gillza

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Kookapeli said:
Mines running perfectly on 2 14400's on a normal DDL driver running at 180mA. PHR 803t's needs around 5.5V and with 1.5V drop out on the driver that would be plenty.
Click to expand...

By DDL driver I assume you mean the driver based on the lm317 regulator as per daedal's original post. Lm317 requires 2.5 - 3 V dropout for regulation (you can check the specs online), not counting 1.25V on resistor and 0.7V on the rectifier diode that are parts of the driver circuit. The driver will need something like 9V to work properly with 4V diode (blu-ray) :)

Now are you sure that you have a DDL driver based on lm317 and not something else? :)
 
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Warzon3

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hmmm I just checked out this build and that one works with 2 14500's and a LM317T combined with a 10ohm resist as the driver. since it is the same diode if it works for that build it should work for my build as well right?
 
gillza

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Ok Kookapeli meant to say 10440 batteries not 14400 that is why I could not find specs on those, and those can go as high as 3.7V so two would give 7.4V. At 7.4V using lm317 to power 4V diode (4+2.5+1.25 = 7.75) is pushing it but possible. If these can also go to 4.2V when fully charged, it is certainly possible and I stand corrected.

With 14500 that go as high as 4.2V you should be fine. Remove the rectifier diode (+0.7V ;) )from the circuit and just be careful when you are inserting the batteries. Also you can use lm1117 with dropout of 1.2V (if i remember correctly) in the same setup to get even more out of your batteries.

So to answer your question to the best of my knowledge it should work.
 
Kookapeli

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Yeah 10440's :) I assumed it was a DDL driver i was using, it's just a basic driver from Odicforce ???
 
gillza

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I see :) I would think those from odiforce are a bit more complex than DaeDaL's driver. Maybe someone can provide more info on these.
 
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Warzon3

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ahhhhh gillza thanks for correcting kookapeli since you now saved me from a stupid mistake :p
I assumed he meant 14500's (AA size) cause I was unable to find 14400 but I can find 10440's wich are slightly larger then AAA. Since my host will be able to hold 3 AAA's I can use 3 10440's wich will give me 11.1 Volt wich is plenty for this laser.

With your post you jsut saved me from buying 2 14500's with charger and then messing around with modding the battery holder now I orderd the right ones thank you ^^
 
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gillza

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Warzon3 said:
ahhhhh gillza thanks for correcting kookapeli since you now saved me from a stupid mistake :p
I assumed he meant 14500's (AA size) cause I was unable to find 14400 but I can find 10440's wich are slightly larger then AAA. Since my host will be able to hold 3 AAA's I can use 3 10440's wich will give me 11.1 Volt wich is plenty for this laser.

With your post you jsut saved me from buying 2 14500's with charger and nw I orderd the right ones thank you ^^
Click to expand...


Heh glad to be helpful :)
 
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Warzon3

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ok I gues all my questions are answerd thank you :)

Now I need to wait till my parts arive and everyone here probably knows how hard the waiting is >.>

For anyone intrested gonna be using the Blue M host from stonetek
blue1.jpg
 
gillza

gillza

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Kookapeli said:
Well at least I know it's not a simple driver I have. Here is the specs for the one I have
OFL Diode Drivers - OdicForce Lasers Online Shop
Click to expand...

Thanks for the link! Yeah the one in the picture is definitely not a DDL :) and it has low dropout 0.5-1.5V.

Man, sometimes I'm regretting that I chose chemistry as my major instead of electrical engineering :)


Warzon3 said:
ok I gues all my questions are answerd thank you :)

Now I need to wait till my parts arive and everyone here probably knows how hard the waiting is >.>

For anyone intrested gonna be using the Blue M host from stonetek
blue1.jpg
Click to expand...

I wanted to buy that Mohrenberg's host for a while now :) but seem to run out of money paying bills and stuff far too fast :(
 
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Warzon3

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the host was only $19,99 and then another $10,00 for the diode and since I'm from europe and the dollar is standing quite low It only costed me like €21,00 ^^

Guesed it was a great deal for my first laser build and I can't wait to build it.
 
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