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Old 09-11-2007, 11:12 PM #1
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Default Voltage problem with circuit

I made deadal's current regulating circuit for my gb diodes, and i have a weird problem, the diode only receives ~2.3 volts :-/ the amps are okay, the pot i'm using is a 50ohm multiturn it was set at 7,6ohm which gives 165ma to the diode (1.25/7.6=165ma and i measured it), the diode lights but it's very dim... i tried different voltage input ranging from 6v to 9v and the diode always receives 2.3v. To get the voltage reading, i used 3x 1n4001 diodes in series. When i first tried it, it read 2.7v and my batteries were low, the diode was lighting like it should, it went dim but i don't think it's broken since now the circuit feeds it only 2.3v... Could some part of the circuit have been broken or something ?

here are some pics of my circuit: http://s216.photobucket.com/albums/c.../DIY%20lasers/


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Old 09-11-2007, 11:35 PM #2
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Default Re: Voltage problem with circuit

You could have burned out the pot.. it's rated power is only over its full resistance, and considerably lower for the 7.6 portion of a 50 ohms pot. The LM317 is pretty bulletproof.
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Old 09-11-2007, 11:49 PM #3
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Default Re: Voltage problem with circuit

the pot is rated 0.75 watts, is it enough ?
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Old 09-11-2007, 11:51 PM #4
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Default Re: Voltage problem with circuit

That looks like it's wired right... I would check the components or the supply. :-?

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Old 09-11-2007, 11:52 PM #5
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Default Re: Voltage problem with circuit

That's plenty for the pot...

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Old 09-12-2007, 12:00 AM #6
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Default Re: Voltage problem with circuit

tried different supplies, 4xAAA, 1x9V battery and a 6.8v wall adapter...
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Old 09-12-2007, 12:05 AM #7
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Default Re: Voltage problem with circuit

All are giving you ONLY 2.3V??

I think something's wrong with the LD if that's the case...

Try lowering the amps a bit and use something else just to test it out... do you have one of the AixiZ laser diode that come inside the modules? Try one of these out...

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Old 09-12-2007, 12:14 AM #8
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Default Re: Voltage problem with circuit

i get 2.3v with my dummy (3x1n4001) the diode from the module is broken. I'll lower the amps and get the reading with the ld...
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Old 09-12-2007, 12:31 AM #9
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Default Re: Voltage problem with circuit

OH!!! ;D ;D

Ok.. your circuit is working fine then.

3 X 1N4001's will take about 2.1V, put 4 of them and you should notice a 3V drop. This thing will power up a GB diode

GL;
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Old 09-12-2007, 12:35 AM #10
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Default Re: Voltage problem with circuit

ok so my diode went dim :\ got another one, i have no idea why it broke tho
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Old 09-12-2007, 01:02 AM #11
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Default Re: Voltage problem with circuit

i know what killed it, i used 6,8v as input voltage
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Old 09-12-2007, 01:04 AM #12
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Default Re: Voltage problem with circuit

Changing input voltage shouldn't affect output voltage. If it does, the LM317 is SERIOUSLY fried.
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Old 09-12-2007, 02:08 AM #13
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Default Re: Voltage problem with circuit

Quote:
Originally Posted by paper183
i know what killed it, i used 6,8v as input voltage
Make sure the capacitor has no voltage in it when you hook up the new diode, short the capacitor to get rid of the voltage with the power off. The only other thing I can think of is did you have the diode hooked up before you applied power or measured current? If you apply power to the circuit the capacitor will charge up to a high voltage, so if you then hook up your diode it will most likely die.
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Old 09-12-2007, 02:09 AM #14
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Default Re: Voltage problem with circuit

The LM317 is not regulating voltage, it's regulating the current. All it does is drop the voltage by 2.5-3V

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Old 09-12-2007, 02:37 AM #15
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Default Re: Voltage problem with circuit

I did a test to confirm what I was already certain of. I powered my LD with 160ma's of current. The voltage across the capacitor was 2.51 volts. Then I removed my LD from the circuit and rechecked the voltage across the capacitor. It was 5.8 volts..almost the same as my input voltage of 6 volts.

Once I disconnected power, the voltage of the capacitor dropped quickly. But to be safe I shorted it then reconnected my LD. So my point was, if one connects the LD after applying power to the circuit, the voltage stored up in the capacitor will probably kill the LD.
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Old 09-12-2007, 04:09 AM #16
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Default Re: Voltage problem with circuit

Good point Gazoo. This really can never get enough reiterating. I honestly suggest soldering the Cap right onto the LD for this sole purpose

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