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all blu ray diode pin outs not the same?

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ashenfang

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I have a blu ray diode from a magnavox player. I found the blu ray pin out sheet here on the forums and mine looks just like it. Pin at top, pin middle right, and bottom pin. The diagram shows the top pin as +, the middle pin not used, and the bottom pin as - . Like the diagram the middle right pin doesn't go into a small hole an into the diode, it looks like part of the case.

If I hook up positive to top pin and negative to bottom pin, nothing happens. If I hook up positive to top pin and negative to the middle pin, it turns on. So this goes against the diagram I found here. To verify I put my DMM in diode mode and found that I could only get a reading when positive was on top pin and negative on middle pin.

I assume as with all diodes its only going to work when hooked up right and that there isn't "another" way to do it. Anyone else had a diode that didn't follow the standard pin out?
 





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ashenfang

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hmmm, so how would you explain mine then? Like I said, it came out of a blu ray player.
 
Eudaimonium

Eudaimonium

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Discussed over PM, I suggested that he makes the thread. I don't think I have ever seen somebody seeing a 3-pin bluray diode with different pinout than one widely known.

Ashenfang, can we have a proper picture of your setup and diode pins while soldered?
 
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ashenfang

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Here are two picturess of the diode. I held the diode lkie it would be seen on a pinout picture. (Positive top, negative bottom). The first picture is how everyone says it should be, but hooking up the leads in this manner does not turn the diode on. The second picture is how i currently have it hooked up ( positive top, negative middle)
I left the pics large so that the detail could be seen. You can see that both the top ans bottom pins go into the diode whereas the middle right pin does not.

bluraystandard.jpg




bluraynonstandard.jpg
 
Eudaimonium

Eudaimonium

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You really need to decrease the size of your pictures, it's really difficult to see for some people here.
 
daguin

daguin

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If yours is really "case negative", then it is the first I have ever seen.

Is the "bottom" pin (in your pictures) shorting to the case or the heat sink?

Peace,
dave
 
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ashenfang

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The bottom pin goes directly into the diode (through small black hole, like the top one) it does make contact with heatsink or case. The middle pin is fused directly to the case of the diode.
 
daguin

daguin

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ashenfang said:
The bottom pin goes directly into the diode (through small black hole, like the top one) it does make contact with heatsink or case. The middle pin is fused directly to the case of the diode.
Click to expand...

Does the black part make contact or does the metal pin (or some solder on the pin) make the contact?

As I said above, it will be the first one I have seen.

What was the model number of the player?

Also, what voltage and current are you running through this?

Peace,
dave

Peace,
dave
 
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ashenfang

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Sorry that is supposed to say doesn't. I am typing all this on my phone. So to clarify, the bottom pin does not make any contact with the case or heat sink. The middle pin (the one i am using for neg.) IS soldered to the diode case. The diode came from a Magnavox blu ray player (cheap black friday deal last year). Currently it is being driven at 8.2 volts and 28mA.
 
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anselm

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I left the pics large so that the detail could be seen.
Click to expand...
"CROP" is the magic word here.;)
Currently it is being driven at 8.2 volts and 28mA.
Click to expand...
That's a lot of voltage... is this on your drivers output or input side?

Other than that, I'd say if it works this way, just leave it.
Never touch a running system.
 
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ashenfang

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Thats the voltage measured on the output side of the driver. I am using a 9v as input....should i drop down the input voltage? I am using the LM317 circuit, but that only limits current not voltage. What should the input voltage be....i dont wanna fry it :)
 
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anselm

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No need to lower input voltage.
Are you measuring this voltage when you are actually running the diode,
that would be huge, I personally never messed around with BluRay diodes,
but I read that they work off ~5V,
or is it "idle" voltage, when no diode is attached? Because that
would make a lot of sense then.
 
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anselm

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Yeah, those don't mean anything, you need to measure voltage with the diode attached.
Remember to short the drivers output before connecting the diode, to discharge any capacitors.
There was one driver that gets damaged from running without a load attached.
What is your driver again?
 
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ashenfang

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Ok i will do that. The driver is the one based off the LM317 voltage regulator, a capacitor and resistor .
 
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