Tagged Questions

2
votes
1answer
58 views

Frequency Scaling and current draw

I am trying to power a RPi of 4 AA's, and my mobile power device can only output limited current (500mA), but I can underpower my RPi by frequency scaling. Is frequency scaling and current draw a ...
2
votes
1answer
134 views

Power consumption and frequency

I am making a small, mobile device with the Raspberry Pi that depends on batteries, so power consumption is an issue. I have scaled the "arm_freq_min" (unsure if clock or instruction cycle frequency) ...
1
vote
2answers
399 views

Counting DC power pulses per minute

I need to implement a frequency counter (pulses per minute) of a DC circuit that goes up to 20 volts. A little background, I am building a linear power supply 0-20 volts, 0-3 amps for my relative who ...
1
vote
1answer
192 views

At DC frequency, how long can wire be until signal attenuates almost completely?

Just got curious about this last night when I was wiring a couple of LEDs on my brother's long board. For a simple DC circuit (Battery, resistor, LED), how long can I stretch the wire until the power ...
7
votes
2answers
614 views

Is it true that the power line frequency is kept accurate by atomic clocks?

I've heard rumors that the power line frequency is kept stable and accurate by syncing it with atomic clocks. Is this true? What kind of accuracy does it have? Is this true everywhere?
4
votes
2answers
531 views

Relation between Power consumed and MCPS (million cycles per second) consumed on a processor

I have been working on a ARM cortex A8 board on mp3 decoder. While doing this I have a requirement saying the mp3 decoder solution I am doing should consume 50mW. This generated few questions in my ...