nubie posted on Jul 20 2006 at 12:22 AM said:
I don't understand what you mean.
The power MUST be regulated, that means it shouldn't fluctuate under load. AFAIK the jack bypasses the voltage regulator so the voltage must come in very clean.
You could test this with a digital voltage meter while you are trying to do various things, the voltage should stay constant, not move around.
Another thought would be to connect power to the battery terminals, that way the internal regulator can take care of it for you.
Things are not always the way we wanted it to :rolleyes:
What we mean with "regulated" power supply is meaning that it will not rise up to 7Vdc under very easy load conditions (so end up burning any 3.3V/30mA circuit) and also whould not go as low as 2Vdc under nominal maximum load
But anything +/- 10% the nominal tension value
should be acceptable, of course lesser the variation means better PSU
It's impossible to keep on a exactly same voltage with a circuit complex like a processor as each instruction processed would consume a different amount of power, so that's one of the reasons why we put capacitors nearby CPU sockets :-]
It's very common to find circuits that have separeted grounds, one ground for digital fast-switching circuitry and other for analog voltage-sensitive signals
As squidge told me that with 3.6V it runs ok (I knew that, but wasn't going to try out into my brand new gp2x
h34r: so my very thanx squidge :lol
and even beyond that, to 3.8V
So, it would be nice to have a ideal 3.3V psu wich no matter what you do the voltage keep on 3.3V, but there's nothing like this, we can just get
close to that enough so what we want to work stay working
I found out that the problem with my PSU is specifically with an episode of Robot Chicken, as I could watch The Simpsons and Bromwell High yesterday with no further worries (it's probably because both episodes were into 320x240, but I'm not sure about that)
