Old junk monitor 12 volt no power supply

[John1397]

I found an old Planar led monitor seems to run on 12 volt dc 2.5 amp all I have is a 11.75 power supply from an old vic 20 commodore I wonder if one cut the end off the power supply and open up the planar monitor soldier to wires to the power inside run them out thru a hole and connect to power supply wire hooked up the right way this should work should it not?

[BC_Programmer]

Maybe. Assuming the VIC-20 supply is a later model that outputs DC, (earlier models were AC and the system had a built in power supply to do the AC-DC Conversion) and assuming you find the correct solder pads, use the correct wire pair (VIC-20 has 9V and 12V), get the polarity correct, Don't break anything when you solder it, and the Power Supply itself hasn't already failed in the typical way VIC-20 power supplies do where they deliver massive overcurrent, which would destroy the monitor. All of that- and assuming that there isn't some operational detail that I'm missing.

[Salmon Trout]

Three words: in line fuse. 3 amps.

[John1397]

I looked more closely I see it is 11.75 volts ac so won't work. I think a car battery should work.

[Salmon Trout]

...

[DaveLembke]

12v power supplies are cheap. You can probably find one that is correct to display for under $30. Could probably even get the replacement to that monitor on eBay.

[Mark.]

I looked more closely I see it is 11.75 volts ac so won't work. I think a car battery should work.

a fully charged car battery runs at about 14volts.  but pumps out more amps then that monitor could handle.  plus you have to run it through an inverter.  electronics want AC, batteries are DC.

if the monitor requires 12v and your power supply you want to use is 11.75 then that is close enough - they don't have to match 100%.but it isn't just the volts to worry about, check the amps as well, and again, a 5-10% leeway is OK.

[patio]

He needs to pay attention to advice already given...just sayin.

[Mark.]

+1

[Salmon Trout]

Just because a car battery can pump out hundreds of amps into something that demands it, such as a starter motor, that does not mean it will force a huge current through anything connected to it
 Ohm's law doesn't work like that. A 12 volt appliance rated at 2.5 amps will take 2.5 amps from a 12v car battery. What you want to watch out for is a fault condition or a short circuit. That's when the fire risk arises. As I said , use a fuse.
 
 

[Geek-9pm]

Just because a car battery can pump out hundreds of amps into something that demands it, such as a starter motor, that does not mean it will force a huge current through anything connected to it
 Ohm's law doesn't work like that. A 12 volt appliance rated at 2.5 amps will take 2.5 amps from a 12v car battery. What you want to watch out for is a fault condition or a short circuit. That's when the fire risk arises. As I said , use a fuse.

Worth repetition.