Old 07-20-2008, 08:49 PM #17
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Default Re: Blu-ray labby (lots of nice pics)

50% of the sockets in my house aren't even grounded. :-X


I will try to insulate the heatsink tho, and if something happens with the diode I'll let ya'll know.


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Old 07-20-2008, 09:42 PM #18
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Default Re: Blu-ray labby (lots of nice pics)

Hehe, yeah, i have a few such sockets too - using the mass as ground.. By itself it works, but if you connect two devices between each other, and one is in a grounded socket and the other one in the tweaked socket, you short the electrical system and burn a fuse..

But i don't think the socket has to be grounded to provide a discharge path...
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Old 07-20-2008, 10:00 PM #19
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Default Re: Blu-ray labby (lots of nice pics)

Nice work FML! Like everybody else I like how you soldered those washers together to make a heatsink.
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Old 07-20-2008, 10:08 PM #20
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Default Re: Blu-ray labby (lots of nice pics)

WHAT?! that sounds deadly!


I have to ask you something while you're at it.

I made a centrifugal water pump out of a big 24v DC motor, powered by the 12V adapter in the pic above. When I was done I wanted to test is so I filled up the kitchen sink and turned it on. My elbows rested on the sink, the motor drive shaft is exposed to the water and the motor's casing is made of metal, which I held in. I dipped the pump in the water and it worked (of course [smiley=happy.gif]). At first I didn't feel anything, but after a short while my elbows got kinda hot, later painful. Then stinging.

Why is that? :-/

Quote:
Originally Posted by styropyro
Nice work FML! Like everybody else I like how you soldered those washers together to make a heatsink.
Thank you.
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Old 07-20-2008, 10:58 PM #21
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Default Re: Blu-ray labby (lots of nice pics)

Quote:
Originally Posted by FireMyLaser
WHAT?! that sounds deadly!
Actually no. It would be "deadly", if it was connected to phase. But this way, it is safer than no ground.


Quote:
Originally Posted by FireMyLaser
My elbows rested on the sink, the motor drive shaft is exposed to the water and the motor's casing is made of metal, which I held in. I dipped the pump in the water and it worked (of course [smiley=happy.gif]). At first I didn't feel anything, but after a short while my elbows got kinda hot, later painful. Then stinging.

Why is that? :-/
;D I don't think it has anything to do with electricity.. Especially since you powered it from only 12V...

I think it's more likelly to be related to you resisting the centrifugal forces and leaning on the sink too hard?
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Old 07-20-2008, 11:31 PM #22
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Default Re: Blu-ray labby (lots of nice pics)

No the pump isn't constructed like that. I tell you - it hurt! It felt like electricity. I haven't used the thing since...


I have a multimeter, but oh the irony: the battery is dead now.
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Old 07-29-2008, 01:33 PM #23
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Default Re: Blu-ray labby (lots of nice pics)

silly question, but where did you wire your controll led? before driver,parallel to ld(i know silly guess) ??
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Old 07-29-2008, 01:39 PM #24
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Default Re: Blu-ray labby (lots of nice pics)

Quote:
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silly question, but where did you wire your controll led? before driver,parallel to ld(i know silly guess) ??
Thanks, ArRaY
Probably with a different driver, if he ran it parallel with the LD it would suck away some of the LD's power.
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Old 07-29-2008, 02:11 PM #25
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Default Re: Blu-ray labby (lots of nice pics)

It's not a silly question. I put a 1Kohm (1000ohm) resistor in series with the LED and connected that across the power cable in to the box. So it's before the driver. The LED can then run on 4-16V. The current thru the LED changes with the voltage, which can mess up the the reading of how many mA the laser get. So the best thing to do is to use a stabilised power supply and measure the current thru the LED at in this case 9V. Let's say that it is 10mA. Then connect the laser and driver and you want let's say 100mA, turn the pot to 110mA. 110 - 10 = 100mA.

Or you set the current to whatever you want to the laser and then add the LED.

Or use a 1 ohm resistor in series with the laser diode and measure the mA with volts.
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