Quick question

moody07747 said:

"I reject your reality and substitute my own" -Adam Savage (Myth busters)

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Joel Rainville said:

Reading between the lines here, were you affraid that a 500mA output could fry something?

See, the wall adapter doesn't output 500mA, but it *can* output up to 500 mA. The actual output depends on the target circuitry which will draw what it needs. Up to 500mA.

Plug a device rated 9V 750mA and see what happens. Just kidding

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Klaus said:

There's a bit more to these plug in wall adapter devices. A cheap (tranformer/rectifier) one has a poor voltage regulation, you may get 11 or 12V at low current draw and just under 9V at 500mA.

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Joel Rainville said:

I use a 19V wall plug that came with an old laptop. It's rated at 2.4A. When powering small circuits drawing anywhere between 10 and 200ma, the output is a steady 19.4V. What can I expect when I get near 2.4A? Same voltage? A bit closer to 19.0V? Or lower than 19V (which I doubt)?... Would this qualify as a nicely regulated supply?

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Joel Rainville said:

Klaus said:

There's a bit more to these plug in wall adapter devices. A cheap (tranformer/rectifier) one has a poor voltage regulation, you may get 11 or 12V at low current draw and just under 9V at 500mA.

Click to expand...

Indeed. But that knowledge probably won't help moody grasp the basic concept I was trying to explain, and chances are it is a lot more confusing than helping here.

But hey, here's your chance to be helpful :

I use a 19V wall plug that came with an old laptop. It's rated at 2.4A. When powering small circuits drawing anywhere between 10 and 200ma, the output is a steady 19.4V. What can I expect when I get near 2.4A? Same voltage? A bit closer to 19.0V? Or lower than 19V (which I doubt)?... Would this qualify as a nicely regulated supply?

Click to expand...