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Needing help choosing correct AC power adapter

W

Wedge1

Senior member
I have a bag of AC power adapters. They come from various peripherals that I apparently no longer use.

Now my mom wants to connect her old HP 3300C Scanjet Scanner up so she can scan photos, but I'm not sure which of the four adapters is the correct one to use. If i get this wrong, I will likely toast the scanner.

I currently own the same working scanner with proper AC adapter plugged in. This scanner is completely functional without problems. I thought "why not match the specs of this adapter with one in my bag so I can connect mom's scanner up to her PC". Problem is that I don't know exactly which specs to match up. And none of these adapters are identical to the one mine uses, but I am 90% i put her adapter in this assortment when I disconnected hers about a year ago or so.

Can anyone provide some guidance on this? Which specs do i specifically need to match that of mine?
 
I think as long as it's the same output voltage then you're fine. I have the same scanner, I can take a pic of mine if you want.
 
For that model HP you need:

HP Part #C7170-16500 .. Cost: $21.00
Wall-mount power supply module (Delta ADP-15FB)
Input: 100-120VAC input, 50/60Hz, 0.5A
Output: 12VDC output, 1.25A
Flat blade, non-polarized, ungrounded
Does not require separate AC power cord - For USA and Canada

The web site does not show the Polarity on the power supply module

http://partsurfer.hp.com/cgi-bin/spi/ma...trsrch=&keysel=Power+Module&catsel=%3F

You can buy one from here for $15 ... order the Delta ADP-15FB

http://www.shentech.com/dead12v121ac.html

The plug needs to be: 5.5MM Outside Diamter / 2.1MM Inside Diameter
and you need to match the Polarity of any adapter you have with the
one you know is correct for that scanner
 
Originally posted by: bruceb
For that model HP you need:

HP Part #C7170-16500 .. Cost: $21.00
Wall-mount power supply module (Delta ADP-15FB)
Input: 100-120VAC input, 50/60Hz, 0.5A
Output: 12VDC output, 1.25A
Flat blade, non-polarized, ungrounded
Does not require separate AC power cord - For USA and Canada

The web site does not show the Polarity on the power supply module

http://partsurfer.hp.com/cgi-bin/spi/ma...trsrch=&keysel=Power+Module&catsel=%3F

You can buy one from here for $15 ... order the Delta ADP-15FB

http://www.shentech.com/dead12v121ac.html

The plug needs to be: 5.5MM Outside Diamter / 2.1MM Inside Diameter
and you need to match the Polarity of any adapter you have with the
one you know is correct for that scanner
Click to expand...

Good job.:thumbsup:
 
It was hard to find that info .. took about 10 mins of digging

Thanks ... Happy New Year
 
bruceb, Thank you much.

So i've narrowed it down to two of five. What do you guys think of these, particularly the one on the left?

Pic
 
Neither is good .. you need 12VDC at 1.25Amp or 1250MA
Both of your supplies, while 12VDC are only rated at 1AMP or 10000MA
so you are 250MA short of the needed current for that scanner
It may work, but the pack will likely burn out in short order

You also need to check the plug polarity against the power pack you
are using on your other HP Scanner ... and the plugs on either of the
units in the picture may not fit, so you would need to change them.

Easier to just buy one ... see prior post for a link and which one you need
About $15 plus shipping
 
If you can't find the correct one, then this one might do you. I have no idea what the polarity is (now I do - it is neg on the ring and pos on the tip like god intended. And like the one on the right in your pic) but that's not hard to change with a little cutting and splicing if necessary.

.bh.
 
That is very close to the specs that the HP unit has ... not sure if the plug / polarity is ok
but as you say, it is easy to fix with a solder iron, heatshrink tubing, correct plug
and Voltmeter to verify polarity
 
Originally posted by: Wedge1
bruceb, Thank you much.

So i've narrowed it down to two of five. What do you guys think of these, particularly the one on the left?

Pic
Click to expand...

the cyber acoustics one is probably for some sound equipment around her house. if anything i would say the other one, but people are saying its not enough amps.
 
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