Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.
2
votes
1answer
54 views
DC Voltage Regulation 18V to 12V
I'm implementing a voltage regulation circuit for some audio and video equipment. Input voltage can vary between 12V and 18V DC.
Currently using the MC78T12C 3A regulator but it's getting a little ...
-2
votes
1answer
49 views
Can I change an american 3 pin plug to an irish 3 pin plug without damaging my new Laptop? [on hold]
I just got my new laptop, it has an American charger, it has the same input but a different output to my Irish charger from my old laptop. Can i use my old plug in my new charger's AC adapter instead ...
2
votes
1answer
103 views
Can I differentiate between a UPS, Generator and Main sine wave using a micro-controller?
Are there any distinguishing features of a mains power supply that will allow me to tell the difference between mains power supplied by
the utility company,
a generator, or
a UPS?
How can I use a ...
3
votes
2answers
71 views
How is the power factor part involved in wattmeter reading?
In a wattmeter, the current coil helps in measuring current and the potential coil is used for measuring voltage... but the real power that the wattmeter measures is \$V \times I \times \cos(\phi)\$.
...
0
votes
2answers
59 views
Metering wiring installation
Explain the benefit to the supplier of reducing maximum demand kVa without reducing overall energy consumption? I have researched on it on the net but I need some assistance.
0
votes
0answers
52 views
Description of Earth/ ground straps [duplicate]
I am trying to find a complete definition for earth/ground straps. I have researched the internet but I am not getting any description.
-4
votes
1answer
38 views
series pass power supply [on hold]
High output voltages are common during failure (i.e., shorting) of the series-pass element, in a switching power supply. Failure of the switching element generally results in a condition of?
-4
votes
0answers
28 views
PC power usage related to power supply [migrated]
Not sure if this is the right place to ask such a question, but I don't see a more relevant place on stack exchange otherwise.
So recently I've become kind of obsessed with becoming more efficient ...
0
votes
1answer
93 views
Is there any way to combine data with power?
Imagine I have a standard TTL data signal and want to transmit that data along the same wire that provides power for the receiving device. Is that possible?
1
vote
1answer
44 views
phone battery usage at various audio volumes [on hold]
I was wondering if anyone knows how the power output of my phone varies with the level I set it at. Lets say I plug my phone up to a stereo to play music and I set my phone volume to 5/10 and then ...
5
votes
2answers
71 views
Power Supply (Amperage)
I have two devices that individually require 5V 3A, does this mean I can use a single 5V 3A DC supply to supply the both of them or would the supply need to be capable of 5V 6A in order to power them ...
-2
votes
0answers
67 views
Laptop capacity of battery [closed]
Are there any differences between a 4 cell 44kwr and a 6cell 48kwr? The power is similiar only 4kwr for the 6cell but will cells number matters?
6
votes
3answers
233 views
Powering 800mA router for approximately 1 min
I need a cheap way of powering my internet modem (rated at 0.8A, 12V) for approximately 1 minute in case of power failure (which happens every hour or two) till my secondary power takes over.
I am ...
1
vote
1answer
115 views
How to design a load
Requirements:
I need to design a load that will be powered with 1-4 supplies at any given time. The design requirements are merely that if 1 or more supplies are 'on', there needs to be at least 1 Amp ...
1
vote
0answers
78 views
Trying to choose a high current DC/DC step-down converter
I'm working on a project that will drive a long length of LED strips, the WS2811 kind built into 5050 LEDs on a flexible strip. I've got most of the project worked out, except for power. Since it ...
