??Anyone know about 12v adapters??

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TyQuAnDo

Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Is it just that 1500mA is more than sufficient and will not do any
harm??

thanks in advance.
 
TyQuAnDo said:
Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Yes

Is it just that 1500mA is more than sufficient and will not do any
harm??
Yes


thanks in advance.

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Mike Walsh
West Palm Beach, Florida, U.S.A.
 
Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Is it just that 1500mA is more than sufficient and will not do any
harm??

thanks in advance.
Click to expand...

Yes, higher curent rating is fine, but be sure it's
regulated if the old one was... which it probably was since
most semi-modern scanners have switching supplies.
 
TyQuAnDo said:
Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Is it just that 1500mA is more than sufficient and will not do any
harm??

thanks in advance.
Click to expand...

The unit should only draw from the supply what it needs. As the supply
is sufficient it should work fine.
 
TyQuAnDo said:
Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Is it just that 1500mA is more than sufficient and will not do any
harm??

thanks in advance.
Click to expand...
Assuming it is either A/C or D/C like the original. Also make sure the
polarity is the same if it is a D/C adapter.
 
TyQuAnDo said:
Will it be ok to use a 12v 1500mA adapter on a scanner that states
12v 1200mA??
Is it just that 1500mA is more than sufficient and will not do any
harm??
Click to expand...

Everyone has posted that it will be ok and they *might* be right, but it's
not that simple. Every power supply has an internal resistance that causes
the voltage to reduce as more power is taken from it. The original power
supply might have been 12 volts but reduce to 9 volts under load. Because
the new power supply can supply more amperage it will have a lower internal
resistance and the voltage will drop less under load. Maybe it will still
produce close to 12V at 1200mA and cause damage to your scanner because it
is designed for 9. Also, if you measure the power pack with no load it could
be putting out as much as 19 volts and only reduce to 12V under load, but
your scanner might not use enough amperage to get it down to 12V so could be
running on, say, 15 volts. The other thing is the manufacturers ratings
could just be different. I've had first hand experience with this blowing up
a TV to VGA converter with a more powerful 9V power pack. If the scanner is
expensive then I'd advise getting the original supply.

Regards,
Michael Culley
 
I should also mention that it may work at first but cause damage to the
scanner after a period of time, that's what happened with my TV to VGA
converter.

Regards,
Michael Culley
 
Well I tried it, no damage to the scanner BUT it didn't
scan properly, I kept getting repeating bands of colour across
the scan. So best to get the proper adapter me thinks!!
 
Well I tried it, no damage to the scanner BUT it didn't
scan properly, I kept getting repeating bands of colour across
the scan. So best to get the proper adapter me thinks!!

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Do you have some tinkering experience in electronics ? I once made a
power adapter for a friend's scanner using an old computer PSU (remote
place, no hope of getting a proper replacement). It needs a 15-volt
supply so I had to modify the PSU to get 15V instead of the standard
12V. That won't be necessary in your case. The load will be so light
that you won't even need the fan.
 
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