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11th May 2008, 01:38 PM
| #16 (permalink) |
| Experienced Member  Join Date: Mar 2004 Location: Canada, of course!
Posts: 11,772
  |  Many laser diodes have a photo-diode inside that is used with an external transistor to adjust the brightness. I don't know if these laser diodes have the feedback transistor and I don't know how much extra voltage the transistor needs. The transistor also might limit the current. The datasheet for the laser diode assembly will tell all.
__________________ Uncle $crooge |
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11th May 2008, 01:52 PM
| #17 (permalink) |
| Experienced Member Join Date: Mar 2004 Location: Canada, of course!
Posts: 11,772
| The "manufacturer" AixiZ Service & International, LLC is just a distributor for 184 companies that make laser diodes and many other optical items. The search on the website did not know of the part number for the laser diode.
__________________ Uncle $crooge |
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11th May 2008, 02:33 PM
| #18 (permalink) |
| New Member Join Date: May 2008
Posts: 10
| Torben... thanks for all the info, it is clarifying much for me... audioguru... yeah I was thinking that would be the case. I'm pretty sure that they're actually made somewhere in China. I couldn't find that info on their web site.... Last edited by Willie TwoFinger; 11th May 2008 at 02:36 PM. |
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11th May 2008, 07:12 PM
| #20 (permalink) |
| New Member Join Date: May 2008
Posts: 10
| Another question has come up... "We need to find out the formula for the amps when we wire it series/parallel. Is it just straight up division? If I had lets say 200 diodes wired into four groups of 50 -and each of those four was wired series, and I used a 12 volt adapter- then would the total amps be 1/4th what it would be?" |
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11th May 2008, 07:36 PM
| #22 (permalink) | |
| Experienced Member  Join Date: Oct 2006 Location: B.C., Canada
Posts: 1,003
| Quote:
OK, for this I'm going to assume we're just using bare LEDs here (not laser modules with integrated electronics). Assumptions: all LEDs are 3.2V LEDs which want 50mA; we have a 12V power supply. So Vled = 3.2V; Iled = 50mA, and Vsupply = 12V. The short answer to your questions is "No, the total current drawn would not be 1/4 of of just wiring them all up in parallel. It would be 0." That is, 200 3.2V LEDs wired in 4 strings of 50 LEDs each would not even try to light up from a 12V power supply. Remember that you need (Vled * number of LEDs per string) volts to run the thing. (3.2 * 50) = 160V. You are not going to get a 160V device to run on a 12V power supply without some kind of boost converter. If you used a 160V+ power supply then the current draw would be 200mA (50mA * 4). With a 12-volt supply your longest string of LEDs can be 3 LEDs long. Why? Because 3.2V goes into 12 at most 3 times. So you could do 66 groups of 3 LEDs (with 2 LEDs left over), or 100 groups of 2 LEDs. Make sense? Torben | |
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11th May 2008, 09:37 PM
| #24 (permalink) |
| Experienced Member Join Date: Mar 2004 Location: Canada, of course!
Posts: 11,772
| Everybody is just guessing without detailed spec's. The laser assemblies might need external current-limiting or not. What is their minimum and maximum allowed voltage and current?
__________________ Uncle $crooge |
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