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Yes, peak voltage. Plus some margin, because transformers output their rated voltage at rated current, and with no or very light load the voltage output is somewhat higher. And also because mains volt …

Yes. Plugged in devices consume some amount of power, there is no way around that. How much is another thing, they are required to have some efficiency level by legislation, but older devices draw mor …

The unloaded voltage will definitely be higher, as that is simply the transformer peak voltage output that is rectified into a capacitor. And the transformer has a rated AC output voltage at a rated l …

That is most likely transformer coil whine. The windings vibrate along with the changes in the magnetic field.

It does not turn on by connecting 5V standby output to 12V output, you are just back-feeding the fan with 5V supply. Don't do this as it may cause damage. Connecting PS_ON to GND should work unless th …

Extremely unlikely that these can be connected in series. You can measure it though. These supplies seem to have 3-prong mains inlet, so they must be connected to earthed mains plug. If you use a mult …

Power supplies that can be commanded via for example RS232 or USB interface do exist. Just send control commands from Arduino via RS232 or from PC over serial adapter and you have a power supply that …

Most likely it's not user adjustable. Besides most power supplies need at least some load to keep it happily regulated.

You must use the same IOVCC as what you use as the voltage levels on the IO pins. The device allows to use 3.3V IOVCC. But if the IO pins are sent with lower voltage levels then IOVCC must match that. …

A) The third wire communicates how powerful power supply is connected to laptop, i.e. how much power the laptop is allowed to draw. B) By omitting the communication wire the laptop is not able to dete …

An UK shaver socket has a built-in current limiting and isolation transformer, therefore only meant for powering low power devices with matching plug and consuming low power in a similat way like a sh …

Basically that's what generic holiday season lamps already do - or used to when they were just regular light bulbs in series. So it must be legal. From mains plug goes one single wire to first lamp an …

It just means that the power supply regulator output has a push-pull stage, like an opamp would, but stronger. Normal voltage regulators only implement a push stage. If you have pushbutton to set regu …

It is a common mode choke, and it works to prevent high frequencies conducting back to mains. It is required for switch mode power supplies to pass the required electromagnetic interference tests.

As current needs a loop to flow, if you start from one terminal of the transformer output, trace how the current flows in the circuit, and end back at the other transformer output terminal, you will n …