I need a regulated 5v with a lot of amps. I have a 19v 3A laptop power supply (I'm assuming SMPS for absolutely no reason) and I'm under the assumption that I'll only have to modify some resistors to change the voltage. Am I losing potential amps (probably a stupid question) because they are proportional in ohm's law, or will it magically draw more current from the AC? If I'm on track for an experiment, is it safe physically?
If all of that was off-the-wall bull, how can I get my regulated high-current power? I have tons of DC adapters, how do I tell if it's regulated? Are there components I can harvest to regulate it out of random stuff I probably have? Sorry about the obvious "buy one" as I can only comfortably afford free and my entire project is being held up by the power supply.