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AMC7135 Driven Blu-Ray

yobresal

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How can I get a 350ma AMC7135 to drive a blu-ray at 60ma?
 



chimo

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yobresal said:
How can I get a 350ma AMC7135 to drive a blu-ray at 60ma?
I would really not recommend an AMC7135 to drive a BLuRay. But if you did want to press ahead anyway, you would have to find a way to shunt 290mA. It would have to be in parallel with the LD and should experience tha same dynamic resistance changes with temperature drift as the LD experiences - otherwise as the LD heats up and its resistance drops, it will consume a greater portion of the 350mA. Resistors would fit the first requirement but not the second. It's an expensive LD to risk on a non-ideal driver. There are other solutions you can find on this board. Good luck.
 

yobresal

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Alright, good to know. I bought 20 of these 7135's and plan on using 10 of them for red lasers and was hoping I could use the extras on a blu-ray. Guess I'll have to find another solution. Thanks.
 
S

SenKat

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You can always find another use for those circuits ! Check out the vast array of LDO regulators out there....the sizes and shapes are what intrigues me so much :)
 

styropyro

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If you want an easy blu-ray circuit, use a simple 7805 regulator. You can get all of the parts at radioshack for $5. It's easier to build than Daedal's circuit too.
 

disma

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Ive seen several places where people have said the 7805 circuit made the br die very quickly, less than an hour of on time.

Max
 

Gazoo

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Well it also depends on how the 7805 is being used since it can be used both as a current regulator or voltage regulator. It does suck if used as a current regulator.

My blu-ray is still going strong and I am using the 7805 as a voltage regulator. I am sure I have more than an hours time on it. Would you care to point out where you read people have been having problems with it? Maybe they were not using a resistor and capacitor.
 

Hemlock_Mike

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Gazoo --

What's your series resistor between the 7805 and the LD ??

Mike
 

Gazoo

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It is a 50 ohm .5 watt precision turn pot. The only other components are of course the 7805, a 10uf 16 volt capacitor soldered directly to the diode, and a 1 ohm resistor in series with the pot for measuring current. I have even turned the pot to its least resistance and it put appx. 56ma's to the diode. Never had a problem....
 

jasturbo02

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That was my blueray that died using the 7805 setup, but in my post I did explain that I set it to 47ma's instead of 1-2 ma's past lazing threashold. I'm sure I overdrove that one. I have 2 more diodes on order and I plan to still use the 7805 setup, but I will tune them better this time.
 

Gazoo

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Yup I did go and look at your post. I am not sure how I missed the thread. :p Maybe toked will chime in here and have a reason why his died.

47ma's might be a little on the high side. I am running mine with ~38ma's. The only reason I took it to its max was because I just had to light a match...lol.

Thanks for explaining... :)
 

disma

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hmm, I dont remeber that bieng in there, I thought you had said it was running at 37ma.
that also makes me feel a lot better about the 7805. Im glad you clerified that 47ma killed it! It makes a lot more sense now. :)

Max
 




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