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Old 02-19-2011, 10:38 PM #1
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Red face Got a red and black cable..needing to connect to brown white

So how should i connect them. How can i tell wich is wich.
Its about a flexmod p3 that needs to be connected to a psu(with a brown and white cable coming out of it).

Going to upgrade my 445nm diode driver tommorow so it supports analog so thats why i want to know.

Thanks.


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Old 02-20-2011, 12:04 AM #2
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Default Re: Got a red and black cable..needing to connect to brown white

Direct Current/DC:
Red = Positive
Black = Negative

To figure out what's up with the white and brown:
No manual for the PSU, huh?
I'd suggest you use your DMM to find out for sure, but brown is likely to be positive.
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Old 02-20-2011, 12:16 AM #3
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Default Re: Got a red and black cable..needing to connect to brown white

Take your DMM and test with the PSU on, if constant current PSU make a test load PLEASE. White is commonly the GND, when black isn't present (my PSUs are.. at least. Don't rely on me )
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Old 02-20-2011, 06:45 AM #4
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Default Re: Got a red and black cable..needing to connect to brown white

How should i use te multimeter to test wich side is positive?

Connect both ends to the cable ends and if it reads +12v i have the red mm end to the positive wire? (found this somewhere on a forum but it wasnt about psus)
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Old 02-20-2011, 09:12 AM #5
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Default Re: Got a red and black cable..needing to connect to brown white

Yeah...
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Old 02-20-2011, 09:50 AM #6
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Default Re: Got a red and black cable..needing to connect to brown white

And how should the multimeter be set?

I am a noobie xD
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Old 02-20-2011, 10:01 AM #7
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Default Re: Got a red and black cable..needing to connect to brown white

20V DC.
If it reads "1", you have to dial up to the next scale, like 200V DC.
If it reads "0", you have to dial down to the next scale, like 2V DC.
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Old 02-20-2011, 11:48 AM #8
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Default Re: Got a red and black cable..needing to connect to brown white

Quote:
Originally Posted by anselm View Post
20V DC.
If it reads "1", you have to dial up to the next scale, like 200V DC.
If it reads "0", you have to dial down to the next scale, like 2V DC.
ah ok. and if it reads +12v or -12v i know wich wire is the positive one
it can be another number? + just states positive and - negative?

the flexmod can take up to 24v i have read.
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Old 02-20-2011, 12:07 PM #9
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Default Re: Got a red and black cable..needing to connect to brown white

if it states +12V, then the "COM" (ground) port of the DMM is connected to the negative wire
coming from your PSU.
If it says -12V, then you're "COM" (ground) port is connected to the positive wire from the PSU

You really should know such basic stuff about electricity when your're bulding a laser projecor!

Anyway, I kind of admire how persistent you are in achieving your goal, despite your lack of knowledge!
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Old 02-20-2011, 12:49 PM #10
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Default Re: Got a red and black cable..needing to connect to brown white

it constantly goes from negative to positive when measuring....when powered on...
no steady numbers.
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Old 02-20-2011, 06:10 PM #11
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Default Re: Got a red and black cable..needing to connect to brown white

well i just installed the flexmod with the help of the PL irc chat.

problem is, the 445nm diode now outputs like 1mw...and dies fast. and does not respond to pt-itrust commands(like turning off) it keeps being on.
It is not connected to the itrust now. it is connected to a 3x aaa battery holder, and to the diode, and to the PSU. the psu gives 7 or 12V to the flexmod.
I already tried measuring this voltage with my multimeter but the numbers go crazy.
The aaa battery pack make the diode die out fast.
the aaa battery pack gives about "3" on the multimeter.

Help Please, the chat is empty now
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Old 02-20-2011, 08:25 PM #12
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Default Re: Got a red and black cable..needing to connect to brown white

Update: drlava said i needed a new psu for the 445nm diode because the 445nm required 5v or higher.
My multimeter says the psu gives 3.3v. This is strange because the last tll driver i used on desame cable, desame psu, worked fine with the 445nm module.

Can someone please help me, or link where i an buy a 5, 6 or 7 v psu for cheap?

Thanks.
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Old 02-20-2011, 09:28 PM #13
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Default Re: Got a red and black cable..needing to connect to brown white

Cheapest 3.3V, 5V, 12V power supply:
How to Convert a Computer ATX Power Supply to a Lab Power Supply - wikiHow

I am not sure if this is the best choice for a laser projector, but it IS CHEAP.
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