Hey guys,
I'm having a little trouble building Daedal's LD driver circuit. The first time i built it, it didn't work at all (probably because i wired the load the wrong way around haha), so i rebuilt the entire thing with new parts. Now, the loads do light up, and i get the following measurements (with the pot at lowest resistance):
5.89 v across the 4xAA batteries
1.5 v between v in and v out pins of LM317T
0.06 v between v out and v adj pin of LM317T
0.06 v across the two resistors in parallel
0.00 v across the pins of the pot
4.28 v across load
4.28 v across the two blobs of solder that connect a heap of things
4.28 v across the pins of the 1N4004 (shouldn't this be like 0.7 volt drop or something?)
The above results were taken after the results displayed in the photos below, where the batteries had drained slightly.
The resistance of the two 10 ohm resisters in parallel was measured at 5.8 ohms.
Ive searched for a short somewhere, but i cannot find one. I've also replaced the LM317T (but i replaced it with an older one) and got exactly the same results.
Close up pics of the circuit are at:
http://dilmah.googlepages.com/home
If anyone can see why this is happening, or have any suggestions. or have had a similar problem, i'd love to hear from you!
dil
p.s I also want to sincerely thank daedal, he's examined my circuit and helped me out via PM, and i only found out now that he had the flu..
I'm having a little trouble building Daedal's LD driver circuit. The first time i built it, it didn't work at all (probably because i wired the load the wrong way around haha), so i rebuilt the entire thing with new parts. Now, the loads do light up, and i get the following measurements (with the pot at lowest resistance):
5.89 v across the 4xAA batteries
1.5 v between v in and v out pins of LM317T
0.06 v between v out and v adj pin of LM317T
0.06 v across the two resistors in parallel
0.00 v across the pins of the pot
4.28 v across load
4.28 v across the two blobs of solder that connect a heap of things
4.28 v across the pins of the 1N4004 (shouldn't this be like 0.7 volt drop or something?)
The above results were taken after the results displayed in the photos below, where the batteries had drained slightly.
The resistance of the two 10 ohm resisters in parallel was measured at 5.8 ohms.
Ive searched for a short somewhere, but i cannot find one. I've also replaced the LM317T (but i replaced it with an older one) and got exactly the same results.
Close up pics of the circuit are at:
http://dilmah.googlepages.com/home
If anyone can see why this is happening, or have any suggestions. or have had a similar problem, i'd love to hear from you!
dil
p.s I also want to sincerely thank daedal, he's examined my circuit and helped me out via PM, and i only found out now that he had the flu..