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Author Topic: Molex Power Connector  (Read 807 times)

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Mr Skrunts

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Molex Power Connector
« on: 01 April 2010, 18:12:43 »

4 pin power connector from a PC PSU.

Am I right in thinking pins 1 +2  (yellow = Pin1) are 12V (+) and ground

Need to power a camera up and power to the camera is via 2 connectoers rather than a plug/socket setup.

TIA  :y
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TheBoy

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Re: Molex Power Connector
« Reply #1 on: 01 April 2010, 18:19:03 »

stick a meter on it, but std is 12v=y, 0v=bk, 5v=r
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Mr Skrunts

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Re: Molex Power Connector
« Reply #2 on: 01 April 2010, 18:45:05 »

Cheers jamie,  :y
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Kevin Wood

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Re: Molex Power Connector
« Reply #3 on: 01 April 2010, 19:27:30 »

Bear in mind that many PC power supplies do not behave themselves unless they've got a substantial load on them, on the primary outputs, which will probably be +5 and +3.3. As said, put a meter on it and make sure. :y

Kevin
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Mr Skrunts

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Re: Molex Power Connector
« Reply #4 on: 01 April 2010, 19:32:52 »

Quote
Bear in mind that many PC power supplies do not behave themselves unless they've got a substantial load on them, on the primary outputs, which will probably be +5 and +3.3. As said, put a meter on it and make sure. :y

Kevin


Cheers, will do. 
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KW

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Re: Molex Power Connector
« Reply #5 on: 01 April 2010, 20:16:51 »

As Kevin has already said, every single computer PSU (which are all switched mode) I have come across expects to see a certain load before it will function correctly (eg, truly stabalised voltage, etc) - I'd be very surprised if a camera got anywhere near placing enough load on a computer PSU to guarantee it will be stable (or even start up).

If you are a dab hand with a soldering iron, I'll quite happily post up a schematic for a power supply you can build yourself for pennies.
« Last Edit: 01 April 2010, 20:18:49 by KW »
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KW

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Re: Molex Power Connector
« Reply #7 on: 01 April 2010, 20:50:46 »

Quote
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180473037119&ssPageName=STRK:MEWNX:IT

have ordered this instead
That'll do it for sure, a hard drive pulls around 5W at idle (so you know the supply will definately start up), and I doubt a camera will max that supply out in the current stakes (the supply is rated to 2A on both the +12 and the +5 rails).
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Re: Molex Power Connector
« Reply #8 on: 01 April 2010, 20:55:32 »

Quote
Quote
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180473037119&ssPageName=STRK:MEWNX:IT

have ordered this instead
That'll do it for sure, a hard drive pulls around 5W at idle (so you know the supply will definately start up), and I doubt a camera will max that supply out in the current stakes (the supply is rated to 2A on both the +12 and the +5 rails).

Even if I didnt use it for the camera it has plenty of other uses and not a bad price.

camera req 12v/1A
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KW

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Re: Molex Power Connector
« Reply #9 on: 01 April 2010, 21:03:47 »

Quote
Quote
Quote
http://cgi.ebay.co.uk/ws/eBayISAPI.dll?ViewItem&item=180473037119&ssPageName=STRK:MEWNX:IT

have ordered this instead
That'll do it for sure, a hard drive pulls around 5W at idle (so you know the supply will definately start up), and I doubt a camera will max that supply out in the current stakes (the supply is rated to 2A on both the +12 and the +5 rails).

Even if I didnt use it for the camera it has plenty of other uses and not a bad price.

camera req 12v/1A
Plenty of room to spare in the loading stakes, perfect for what you want.
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HerefordElite

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Re: Molex Power Connector
« Reply #10 on: 01 April 2010, 22:08:32 »

just FYI a common trick is to connect + to 12v rail and - to 5 v rail to give yourself 7volts (as long as you have enough other load on the 5v rail to take the excess) ;)
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