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Take a simple example where the sums are trivial. I have a voltage that is on 50% of the time and off 50% of the time. It is 10V when it is on. The average voltage is thus 5V. If I connect a resistor …

Check out the APM (Advanced Power Management) API and its successor ACPI (Advanced Configuration and Power Interface). Before APM these functions were handled by the BIOS. For Windows 8 and later, M …

It's a distribution transformer, aka 'pole pig'. It lowers the voltage from the higher voltage in the supply lines to the power used in your house. The distribution lines that run down your street are …

This was one of those crap Chinese-made Mains-to-USB chargers that can be purchased for as little as US$1.50. I've taken them apart, and they are bad, criminally bad. The isolation from mains to out …

It doesn't entirely excuse the poor performance of the MCP1700, but I think you'll generally find that very low Iq regulators tend to have much poorer high-frequency PSRR. You would not expect an op …

It's recommended to read the manual for the procedure. Did you read the comment in your link that claims the manual says to set the voltage to 3V and then short? I can't confirm it's the same model in …

Manufacturers, in general, can use whatever name they want, even if the characteristics or even functions vary. If they are members of some organization such as JEDEC they may have agreed upon some co …

You need two back-to-back P-channel MOSFETs for each power input. Here is an example from an Atmel eval board, though you'll want to scale up the MOSFETs considerably, and maybe reduce the resistor va …

First an important note: This is mucking around with potentially lethal circuits and in no way should anything that might be suggested as a result of this answer this be attempted by other than a prop …

They’re adjustable power resistors. You loosen the screw and move the ring to or fro to get the resistance that you want and then tighten the screw. Probably a dummy load for various supply rails.

In telecom the positive terminal of the battery or power supply is grounded. That makes everything powered by the -48V negative or 0 at most relative to ground, which is superior in preventing the mor …

You can use it for things like analog circuits that use +/-12V. You can regulate it down to something lower such as -5V with a linear regulator. It's very useful for analog circuits. Not so much for d …

No, and you'll likely damage one or more of the servos if you try. They will not 'share' the voltage evenly and the one that gets more volts will quite likely die in a shorted condition, subjecting th …

This is true because the LM7815 is stable with any output capacitance- the capacitor is just there to reduce the output impedance at high frequencies. Vout comes from the emitter of the NPN pass trans …

There are two problems with having the -Vs of a 741 connected to ground. First, as others have said, the output cannot go below ground. In fact, with a 741 it can't even get very close to ground, on …