Abray
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- Joined
- Nov 18, 2007
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I apologize if this has been covered anywhere. I searched, researched, and looked through all the first page threads and couldn't find anything similar, and now i'm stuck.
I just purchased the popular A 140 445nm diode, and my driver is having issues. Before deciding on a permanent host for it and all, I decided to at least get it running on some kind of a circuit. I made some blu-rays before so i had plenty of LM317s around.... I know they aren't the most efficient, but all I want right now is to see this beauty shine (at full potential).
I'm using the cookie cutter daedal circuit. 9V battery, LM317, 47mF 16 volt cap, diode for reverse current protection, and 3x 3 ohm resistors in parallel on the LM317. This should be supplying over an amp of current to the diode, but not surpassing the limits of the LM317, correct?
Here are my results...
I tested with a test load to make sure my circuit wasn't too messed up, ended up getting way lower current than hoped (about 130 mV was measured, so translates to about 130 mA assuming my voltage drop is reasonably close).
The LM317 and diode MIGHT've gotten warm when i left the circuit running for very long, but it also could've been my touching it too much, idk. Either way, insignificant heat.
Battery voltage BEFORE tests: 8.4 V
Ammeter hooked up in series with diode circuit turned on for about 5 seconds: ~220mA
Voltage across diode: ~3.84V
Basically, what am I doing wrong here. Why aren't I getting the "correct" (expected, desired) amount of current through the diode OR test load?
I know some basics about circuits, but nothing too complex...
Thanks for any help!
I just purchased the popular A 140 445nm diode, and my driver is having issues. Before deciding on a permanent host for it and all, I decided to at least get it running on some kind of a circuit. I made some blu-rays before so i had plenty of LM317s around.... I know they aren't the most efficient, but all I want right now is to see this beauty shine (at full potential).
I'm using the cookie cutter daedal circuit. 9V battery, LM317, 47mF 16 volt cap, diode for reverse current protection, and 3x 3 ohm resistors in parallel on the LM317. This should be supplying over an amp of current to the diode, but not surpassing the limits of the LM317, correct?
Here are my results...
I tested with a test load to make sure my circuit wasn't too messed up, ended up getting way lower current than hoped (about 130 mV was measured, so translates to about 130 mA assuming my voltage drop is reasonably close).
The LM317 and diode MIGHT've gotten warm when i left the circuit running for very long, but it also could've been my touching it too much, idk. Either way, insignificant heat.
Battery voltage BEFORE tests: 8.4 V
Ammeter hooked up in series with diode circuit turned on for about 5 seconds: ~220mA
Voltage across diode: ~3.84V
Basically, what am I doing wrong here. Why aren't I getting the "correct" (expected, desired) amount of current through the diode OR test load?
I know some basics about circuits, but nothing too complex...
Thanks for any help!