AT power supply to power Laptop. - Electronic Circuits Projects Diagrams Free

ArtemisGoldfish · 22nd February 2007, 03:28 AM

My friend's laptop power supply recently fried, but I took the weird Sony plug of the adaptor and swore to jerry-rig a replacement. Now, I have a 200 Watt AT power supply that I pulled from a 486 from way back when, and I'm wondering the following:

The laptop says it takes 16V at 4 Amps.

Checking the voltage between the +12V and -5V lines shows 16.06V on my multimeter.

The -5V output is rated for 0.5A, the +12V at 8A.

Soo...What amperage do I expect from this -5 to +12 setup? Only 500mA?

JimB · 22nd February 2007, 04:14 AM

Quote:

Originally Posted by ArtemisGoldfish

The -5V output is rated for 0.5A, the +12V at 8A.

Soo...What amperage do I expect from this -5 to +12 setup? Only 500mA?

Yes, only 500mA.
To adapt an old saying: "Chain is only as strong as its weakest link".

JimB

ArtemisGoldfish · 22nd February 2007, 04:37 AM

Would there be some way that I could combine +5V and +12V lines to get a workable voltage? And does the amperage matter so long as it's above the laptop's 4 amp requirement?

Sceadwian · 22nd February 2007, 08:40 AM

Not with one power supply.

Hero999 · 24th February 2007, 02:07 PM

Have you tried it with 12V?

Sceadwian · 24th February 2007, 08:47 PM

Hero might have something. I mean what inside a laptop could really need 16 volts? It might just be overhead for the linear regulators. Since you're feeding it regulated 12 volt power, it may work. But I don't know much about the power section of a laptop and it could burn out or cause unintended malfunctions, just had to tack that disclaimer on there in case it blows up when you plug it in =>

ante · 2nd March 2007, 05:39 PM

Quote:

Originally Posted by Sceadwian

Hero might have something. I mean what inside a laptop could really need 16 volts? It might just be overhead for the linear regulators. Since you're feeding it regulated 12 volt power, it may work. But I don't know much about the power section of a laptop and it could burn out or cause unintended malfunctions, just had to tack that disclaimer on there in case it blows up when you plug it in =>

Most likely it will run fine on 12Volts; however the battery may not be fully charged.

Thread Tools
Show Printable Version Email this Page
Display Modes
Linear Mode Switch to Hybrid Mode Switch to Threaded Mode

Similar Threads
Title	Starter	Forum	Replies	Latest
Got a new EVBoard How do i supply power to it?	cubdh23	Micro Controllers	2	3rd August 2007 10:39 AM
24v DC Power Supply (Help & Information Wanted Urgently)	ampthetex	Electronic Projects Design/Ideas/Reviews	5	17th November 2006 01:45 PM
Power Supply for a project to be powered within an Auto?	hexibot43	General Electronics Chat	16	8th September 2005 03:36 PM
Power Supply Failure	Joel Rainville	General Electronics Chat	8	24th August 2005 02:42 PM
Low current power supply from stored current.	McGuinn	Electronic Projects Design/Ideas/Reviews	12	20th January 2004 07:15 AM

22nd February 2007, 03:28 AM	(permalink)
ArtemisGoldfish	AT power supply to power Laptop. My friend's laptop power supply recently fried, but I took the weird Sony plug of the adaptor and swore to jerry-rig a replacement. Now, I have a 200 Watt AT power supply that I pulled from a 486 from way back when, and I'm wondering the following: The laptop says it takes 16V at 4 Amps. Checking the voltage between the +12V and -5V lines shows 16.06V on my multimeter. The -5V output is rated for 0.5A, the +12V at 8A. Soo...What amperage do I expect from this -5 to +12 setup? Only 500mA?

22nd February 2007, 04:37 AM	(permalink)
ArtemisGoldfish	Would there be some way that I could combine +5V and +12V lines to get a workable voltage? And does the amperage matter so long as it's above the laptop's 4 amp requirement?

22nd February 2007, 08:40 AM	(permalink)
Sceadwian	Not with one power supply. __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."

24th February 2007, 02:07 PM	(permalink)
Hero999	Have you tried it with 12V? __________________ I also post at the following sites: http://www.stop-microsoft.org http://www.heated-debates.com Screen name: Aloone_Jonez And http://www.silicontronics.com, same screen name as here.

24th February 2007, 08:47 PM	(permalink)
Sceadwian	Hero might have something. I mean what inside a laptop could really need 16 volts? It might just be overhead for the linear regulators. Since you're feeding it regulated 12 volt power, it may work. But I don't know much about the power section of a laptop and it could burn out or cause unintended malfunctions, just had to tack that disclaimer on there in case it blows up when you plug it in => __________________ "Because I be what I be. I would tell you what you want to know if I could, mum, but I be a cat, and no cat anywhere ever gave anyone a straight answer, har har."