Hi,

I' m going to buy the scanner "Canoscan LIDE 30" OR the "Canoscan 3000".
The first one is POWERED by USB 2.0., but scans SLOWER than the second.

The "Canoscan 3000" works with a voltage adaptor to feed the device and scans FASTER (my favorite).

QUESTION:

What is the voltage (DC) that this scanner "Canoscan 3000" needs at the little input pin: I suppose 5, 10 or 12 Volts??

I want to get rid of the adaptor and solder a connector to my computer that goes in the connector pin of the scanner.
12 Volts DC is the highes low voltage a standard power supply can give in the case.

Thanx a lot.
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PS it is/was impossible to find the voltage in brochures, also to find any dedicated helpdesk.
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Attaching anything to the computer's PSU externally is not recommended.
First of all, you open yourself up to trouble - EMI, as well as the physical problems presented by extending a cable beyond it's normal working length (voltage drop, spikes etc).
THe second problem is that unless you strike lucky, you are unlikely to get the exact voltage required, together with the current rating.
Powering a scanner from the internal PSU will place a tremendous strain on it, which could cause the rest of the system to fail. They simply aren't designed to handle such noisy, mechanical objects such as scanners.

Something to remember is that the speed of a scanner isn't really important (unless you're scanning thousands of images), and the slower model will probably present a clearer, crisper image than the fast model.

This is little exagerated, no?
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The brochure of the Canoscan states that the consumpion is 15 Watts (5 Watts standby)
So if it 15 Watts (at 12 Volts = this I don' t know yet) is pulls 1,25 Ampère, not that much.
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BTW, I will connect is to the flat 4 pins connector (if 12 Volt maximum),on the cluster were 2 harddrives, 2 CD RPMS and 2 fans are ALSO attached.

The extra load of 15 Watts to a 300 Watt standard supply CAN' T be a prob.

I' m still interested in the voltage the scanner needs.

Tnx, kind regards
Dirkk

If you are talking about an ac adaptor that plugs into the wall and to the scanner, otherwise known as a 'wall wart', they are simply an ac to dc converter and the output voltages and current available is listed on the 'fat thing' you plug in the wall.

Why do you need to eliminate the power adaptor for the scanner?

As for your statement adding up power consumption from CD-R's and HDD's, you musn't forget that the PSU and mobo use a considerable amount too.

I'll second the 'not wise to do' suggestion stated above.

I will add my vote to the not wise section.

I will however also add that if the adaptor doesnt say what voltage it uses, then the input socket on the scanner should specify its voltage as well as its positive and negative arrangement. Otherwise you will need a voltmeter/multimeter.

You may be out of luck with using the comps PSU, I myself have a Canoscan that runs at 6.5 volts DC. Such a voltage would require making your own regulator to attach to the 12V leg and short of trying to get industrial type components your current may be severely limited meaning the scanner wouldnt run anyway.