New question... Not as involved as the last wiring problem, but something I don't understand.
It involves power supplies (transformers) for electronics. Since one of my hobbies is to buy older electronics of all kinds... toys, computers, phones and a whole lot of other things like remote thermometers, digital cameras etc, etc... Anything that's in the resale shop for $.10 to maximum of $2... (Thats for the REALLY good stuff, like CB's or Bose Speakers). Latest is an airplane Altimeter (went all the way there...$2.)
Anyway...Most of the powered devices require a power supply. Over the years, I have collected about 100 different power supplies, that I search through to get my latest purchase working (as some devices don't come with the supply).
Most of the devices have a terminal that fits the power supply, as in the 5V USB plug ins, but others either have no voltage indications or will accept the male terminal ends for supplies that differ in voltage. Also, is the matter of amperage. Some devices call for 100mA, other 200mA, 300mA or 500mA.
Here's where the questions come in...
1. The male terminal ends may fit into devices that call for more or less Volts.
2. Some male terminal ends that are the same size, can be on supplies that output anywhere from 2.5V to as much as 32V... on an old printer.
3. The outside of the plug and the inside of the plug (the pin) differ . Is that to prevent using a higher voltage power supply?
4. What happens when the power supply fits, but is lower or higher than the specs. So far, I haven't burned any devices out with too much power, and the difference between 3.7V and 7.5V on some devices DOES work.
If I can't identify the power supply for the device, I take a picture of the device and go to Google Images which almost always solves the problem...
So... without going into a treatise... are there some general rules of thumb? And is there a Voltage/Amps for Dummies article available. Current question is for an unidentified 2.0 USB splitter hub. I'd assume 5.0V 300mA but saw another one on Amazon with a 3.5V 100A. The hub works w/o external power, but I'd assume that some USB devices need more...
Confused and Amused in Illinois.