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Old 10-29-2010, 08:21 AM #1
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Default Possible dead 803T diode?

Hi all

I bought a PHR-803T laser diode in aixiz module from HighTechDealZ - High Tech DealZ and it arrived today, I connected it to a simplified DDL driver with just an LM317T and a 12 ohm resistor between ADJ and V-OUT pins. I then connected it to a 9V alkaline battery and nothing.

Have I done something wrong, I also tried using another 9V battery then a 9V DC power supply which outputs 500mA. Still nothing at all.

All the components are new, I have substituted resistors and the LM317T but still nothing, the connections are all good so I just don't know what is wrong.

Could I have a dud diode? What do you suggest.

Thanks


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Old 10-29-2010, 12:02 PM #2
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Default Re: Possible dead 803T diode?

Did you use a capacitor to protect against spikes?

Did you use proper ESD procedures?

Did you double check all of your soldering joints?

Any pictures of your circuit?
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Old 10-29-2010, 12:51 PM #3
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Default Re: Possible dead 803T diode?

Are you sure sure you used the right pins?
Remeber PHR diodes are not the same as LOC and reds.
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Old 10-29-2010, 07:47 PM #4
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Default Re: Possible dead 803T diode?

Yes, I used proper ESD procedures, soldering joints were fine and I got HighTechDealZ - High Tech DealZ to solder the LD leads on which are fine.

No I didn't use a capacitor - but shouldn't it at least give off a glow?
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Old 10-29-2010, 07:57 PM #5
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Default Re: Possible dead 803T diode?

My PHR I just received from hightechdealz doesn't work aswell, I am using a rkcstr micro drive set at 100mA.
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Old 10-29-2010, 08:28 PM #6
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Default Re: Possible dead 803T diode?

I guess this is the "fun" part of laser building...
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Old 10-30-2010, 05:57 AM #7
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Default Re: Possible dead 803T diode?

Did you test on a dummy load before hooking them up to your diode?
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