Old 12-31-2007, 12:06 AM #1
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Default Need driver help

Well,i haven't been able to get a 100%precise answer,(might be because the pics i uploaded earlier where rather crappy...) *
But since i don't want to fry my diode,im posting some clearer pics of my circuit,in hope that some of you could tell me if i should fix something or its good to go... *
http://img168.imageshack.us/my.php?i...024x768sz2.jpg
http://img175.imageshack.us/my.php?i...024x768av3.jpg
http://img296.imageshack.us/my.php?i...024x768ew0.jpg
http://img183.imageshack.us/my.php?i...024x768af2.jpg
http://img341.imageshack.us/my.php?i...024x768yb8.jpg
http://img166.imageshack.us/my.php?i...024x768ix7.jpg
http://img245.imageshack.us/my.php?i...024x768ot3.jpg
http://img244.imageshack.us/my.php?i...024x768xn7.jpg


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Old 12-31-2007, 12:18 AM #2
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Default Re: Need driver help

Jeez, half those pictures are out focus.

I think you're close but it's hard to tell. The yellow wire on the far left pin of the voltage regulator needs to be soldered to the green end of the resistor I believe. It's hard for me to tell if you've got the cap/diode correct -- they do have a polarity that must be correct.

Do you have a multimeter, also what are you using for batteries? I you meter the circuit (tap it where the LD would go) you should see about 5-6 volts (no load) and you should also be able to meter the current. I would suggest adjusting the pot so there's no more than 50-100 mA of current before you attach the diode.

If you're using a diode you ripped out of a DVD drive make certain you know which pin is which!!
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Old 12-31-2007, 12:25 AM #3
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Default Re: Need driver help

Quote:
Originally Posted by flogged
Jeez, half those pictures are out focus.
If you'd have seen the other pics... *;D

I'm using senkats dvd diode,so i know the pin placing
I'm using a 6v battery(it looks like it is 2x cr123s)
The problem i have is that when i meter out the current (in DC mA range) it goes straight to 250(which is max...)
My multimeter is rather old,so it cant tell me the volts ^^ /somehow it can,haven't figured it out yet
I have the cap with the negative lead on the negative (blue side) while the diode is with the little white marking in the positive(red) side,although from what i can get out of my electronic handbook the white thing marks the negative side...
I have tried switching the diode around(other way) and no connection,so everything seems fine,but im still getting WAY to much current trough my circuit...
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Old 12-31-2007, 04:26 AM #4
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Default Re: Need driver help

Well, ideally you'd use a breadboard to test/check the circuit before soldering everything up.

So when you measure the current while adjusting the pot it stays maxed out? Definitely a problem with the circuit then. Just take your time and get it right before putting the diode in.
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Old 12-31-2007, 08:16 AM #5
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Default Re: Need driver help

hehe,i do not really have much time,at least not if i want to have fun w/ it @ the new year(we are driving from home in around 8hours...)and i want to be on the safe side when lighting firework^^
Oh,and i have spent what seems like ages(more half a month)trying to find the bad part...and i seem to be unable...either i am unable to read my multimeter,although ive been told that i should measure it in DC mA range,or i somehow have a perfectly looking circuit that acts like its not...OH,BTW: i have soldered the orange wire from the lm317 to the green end of the resistor...Would a 10ohm pot give around 1 ohm resistance at its lowest?so i can test my circuit w/ the 4 diodes& a 1ohm resistor...oh,and electronical mini parts are generally pretty hard to come by in Denmark...no radioshack ><
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Old 12-31-2007, 09:20 AM #6
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Default Re: Need driver help

the si diode and the cap seem to be properly connected. it's hard to see if the trimmer pot is hooked ok, though. besides, it looks too small to handle much current without burning a spot under the wiper.
Do you have a photo of ur DMM? If the current your circuit provides exceeds DMM's max mA limit, you have to switch to its highest range /normally 10A/ for which there is a dedicated receptacle /the uppermost one/ where the red probe should go.
Attached Thumbnails
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Old 12-31-2007, 09:27 AM #7
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Default Re: Need driver help

The two pins you have marked are connected together,like in daedals post/like you have shown there(there are pins on them,and i have soldered on to those)The pot is the one from senkats package,so it should be ok,not sure thoguh.
And i have soldered the yellow/orange wire to the little "knob" of solder you can see right before you marked
Well,my multimeter is a hung chen hc-213(analog piece of crap)...
I have a pic of it here,but it isn't very clear,though i can get a better one if required
What is a Dmm?Digital Multi Meter?
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Old 12-31-2007, 10:06 AM #8
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Default Re: Need driver help

ok, the easiest/safes way to go with your meter is to use a resistor as a dummy load and measure the voltage across it and then derive the current. a 1ohm res will result in a voltage too low for ur meter to measure reasonably accurately, so if u have a spare 5ohm resistor/ like the one in ur circuit/ you could use it as a load, set the meter to measuring voltage and connect the probes as shown in the picture above that I just edited.
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