Can the AC adapter from my speaker work on a laptop?

[SuperCyrix]

Suppose the output is 15V and 2A for the AC adapter for the laptop.
The output of the speaker's AC adapter is 15V and 1A. Since the AC adapter plugs into the batter, I just figure it will charge it slower at 1A instead of 2A. Can anyone tell me if doingt this can possibly harm the hardware?

 

[Jerboy]

<< Suppose the output is 15V and 2A for the AC adapter for the laptop.
The output of the speaker's AC adapter is 15V and 1A. Since the AC adapter plugs into the batter, I just figure it will charge it slower at 1A instead of 2A. Can anyone tell me if doingt this can possibly harm the hardware? >>



No! You'll more than likely smoke that poor AC adapter

 

[jschuk]

Or you could smoke the power system in the laptop. I have seen under-amped laptops die and the AC adpt survives. You might be able to get away with "only" charging the battery and yes it would probably take longer charge. I wouldn't recommend doing it long term (guessing once a day for a week).

 

[grrl]

You also have to be sure the polarity of the two jacks are the same.

 

[Workin']

That's a very bad idea, unless you like fires and want to possibly buy a new computer.

 

[SuperCyrix]

Assuming the polarities are matched. What if I can find some other AC adapter that is 15V and 2A. Will that work with the laptop or do laptop AC adapters have some other requirements that I don't know about. I'm asking this because I can easily find an AC adapter that's 15V 2A for $19 at a local electronic store while the AC adapter sold for Toshiba laptops are $69.

 

[obenton]

I'd think that would be OK. Never did that with a laptop, but with other equipment, and it's never caused a problem as long as the transformer was able to provide the necessary amps.

 

[Jiggz]

If the voltage rating of the adapter is equal (+/- 5%) and the current rating is equal to or greater than the required load (laptop) it should work. The question you might want to ask is if the quality power output of the adapter is acceptable to the laptop. Voltage spikes and high ripples (unfiltered ac voltages on a dc volt output) on the adapter output can actually damage your laptop. The only way you can verify this is by the use of a multimeter or an oscilloscope.

 

[Jerboy]

<< Suppose the output is 15V and 2A for the AC adapter for the laptop.
The output of the speaker's AC adapter is 15V and 1A. Since the AC adapter plugs into the batter, I just figure it will charge it slower at 1A instead of 2A. Can anyone tell me if doingt this can possibly harm the hardware? >>



Another thing to consider is what type of AC adaptor it is15V speaker adaptor is probably a linear supply and it will be something like 20V under no load, 15V under 1A of load and probably considerably less at 2A. The voltage varies proportionally with load. Notebook supply is likely to be a switching power supply. It is actively monitored and maintains 15V throughout the varying load up to maximum rated current. In theory it is quite possible to destroy one or the both.

 

[SuperCyrix]

What about the Garden Variety AC adapters that can be found at Radio Shack or any other electronics store. Would those maitain a constant 15V ? So are most AC adapters linear or just the ones for speakers?