Where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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0
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2answers
23 views

Connecting the protective ground of a 3 phase AC motor

I am wondering how can I connect the protective earth of my 3 phase AC motor? Here is the background of how my connections are: I am using 3 phase with a neutral point from the mains which goes to ...
-2
votes
1answer
50 views

What determines the amount of power sent to a device?

I have various devices that draw amount different amounts of power from a micro power connector. If I have a 240V socket plugged into a device which draws 4W of power, does this mean that the power ...
-4
votes
2answers
40 views

Power dissipation in a circuit [on hold]

What would be the power across 5ohms resistor and 3 to 7ohms (variable) resistor?Is the power same or different?why?
0
votes
0answers
39 views

Thinnest transformer 220v to 5v [on hold]

I'm looking for thinnest transformer (planar?), that convert 220v to 5v. Or maybe some other method, that allows me to convert 220v to 5v? I want to make it smallest as possible.
0
votes
0answers
28 views

Power Rating On Extension Cord [on hold]

I have bought last night an INDUCTION COOKER with a max power of 2100 Watts. I need an extension cord to use it to cook foods outside my room. Now, I checked my extension cord cause I thought it might ...
1
vote
0answers
15 views

Compression and communication power consumption trade-offs

Let's say I'd like to save battery power consumption when sending data to remote devices connected wirelessly, i.e., sensor networks. One of the ideas may be compressing the data to reduce the number ...
0
votes
0answers
31 views

Using p-Channel MOSFET as a Switch to turn load on / off via BeagleBone Black GPIO

Is this the correct way of using a pMOSFET as a High Side Switch? I need a Load Device to be turned on/off (Vin Pin). The Load Device requires 5v 700mA power to run. My logic is, when the ...
-3
votes
2answers
54 views

What is the best way to power a wearable device such as flexible oled screens? [on hold]

What is the best way to power a wearable device such as flexible oled screens? Possibly a way that wouldnt alter the size of the wearable?
-2
votes
0answers
23 views

optoisolator with BTA12 to drive high wattage motors [on hold]

can I use optoisolator with BTA12 to drive the motors actually use in farms for irrigation? and how?
-1
votes
2answers
66 views

Under what conditions will the following circuit work?

The following circuit that only has a single supply wire and not grounded (see below). Under what condition can this circuit be made to work (supply a small amount of rectified current, say 5mA). In ...
0
votes
1answer
33 views

AC/DC wall adaptor as LTSpice Analog behavior model (ABM)

Suppose a circuit shuld be supplied ( in real life ) from a wall mount AC/DC adaptor. The adaptor has a nominal voltage of 12VDC 500mA. With no load the adapter puts out 21.6V. After some measurement ...
-3
votes
2answers
67 views

How to power a large RTL project?

I saw this yesterday, and I have been thinking about this: How is all that powered without losing any voltage or power over parts of the project? Would the battery just end up having more energy ...
1
vote
3answers
376 views

Does a given size wire have a maximum power or a maximum current that it can transmit?

I've lost my 'intuitive feel' for current, voltage and power in a conductor (like a 18 gauge copper wire)... The wire seems to be rated by maximum current rather than maximum power... Does that mean ...
2
votes
1answer
29 views

One-Line Diagram Standardized Symbols Information

Good day, people. I'm trying to get into electrical substation design and I'd like to know which standard sets the rules for substation One-Line Diagram Symbols . Any ideas of where can I get that ...
0
votes
0answers
9 views

Using WeMo controller with AC that uses 6-15p plug [closed]

I have an older A/C unit that uses a 6-15p plug. I want to be able to remotely control the unit with a WeMo, but it uses a 5-15r receptacle and plug. The A/C unit says its rated for 208V, and I ...
1
vote
0answers
28 views

Where to source the plug end of a PC power cable [closed]

Im building a relay control system, and Im currently using some modified 125v 10a pc power cords with a receptacle on the other side, and the normal female plug on one. The problem Im having is ...
1
vote
2answers
62 views

How to efficiently boost a low voltage high current input to a high voltage low current output

I have a 3.7V 6600 mAh lithium-ion battery that I'd like to use to power some small 6V motors that only require 500 mA. However, I need the battery supply to last as long as possible (which is why I'm ...
0
votes
0answers
19 views

How do I power / control a brushed 115V AC motor?

How do I power a brushed 115v AC motor? Would there be any potential damage from just wiring it to just plug into the wall or do I need a transformer and a capacitor or something? Thanks!
1
vote
1answer
36 views

What is a reasonable sustained current load for a typical AA Li-Po battery?

I would like to build a cutdown mechanism for a balloon's nylon rope using NiChrome wire. To make the cut-down mechanism as simple and cheap as possible, I want to stick to using AA batteries. To ...
-1
votes
1answer
79 views

is this circuit board usable

I was carrying out a modification on an xbox 360 controller and there were 3 spots I needed to solder wires to. The first two went well. However, I had a problem with the third. Each spot I was ...
0
votes
1answer
45 views

Trying to power a 100-watt Cree Xpe array as efficiently as possible with dimming

I've recently purchased a 100-watt Cree 30-module XPE multichip ...
-5
votes
0answers
25 views

Transformer equivalent [duplicate]

please I really need a quick answer. I have got a multiple cell-phone project I want to do. according to the project it uses 6v3amp tranfmr but seems i cant find any at hand now. pls can any one ...
0
votes
2answers
69 views

Bench power supply “Issues that rouse during build”

I'm building a power supply, based on this instructable and this one I am using 24volts DC power supply, 7+ amps circuit is based on LM338 / 7805 / 7812 Circuit is working although few things ...
0
votes
0answers
57 views

Using half of a 240v dual-phase circuit as a 120v single-phase circuit (US) [migrated]

Usually when I see a 240v device, it is wired to its own double-pole circuit breaker, with each pole connected to a different 120v phase (to provide 240v total). If there is a 120v device in the same ...
1
vote
1answer
59 views

Replacing a relay by a transistor

i'm new in electronic, I made a simple circuit to control a pump it's working, but i'm really not happy of the result. I have to plug 2 power sources because if I have only one for the pump and the ...
-1
votes
0answers
19 views

maximum power transfer this design could give and the supercapacitor sizing [duplicate]

please I really need an immediate respone to be passed as a design problem tomorrow. tnx how to determine the size of the supercapacitor to be used so that the unit could supply electrical energy ...
-1
votes
1answer
53 views

Using diodes to supply current

I have connected a 6a silicon diode to my psu and i supply 12v dc current trough that diode to my car audio head unit,But why is this diode is over heating? please anyone answer me.
0
votes
0answers
32 views

Maximum Power Output For DC Motor

For now I don't have a graph on which my question is based. I will add it as soon as I get it. The graph between power output or mechanical power developed and the armature current for a dc motor is ...
1
vote
0answers
56 views

Short cirucit protection

I have built an AC/AC cuk converter for an assignment I am doing. It works as such, I provide 50V AC in and I get an adjustable voltage out from 0V to 50V AC, depending on the duty cycle of the PWM ...
5
votes
7answers
787 views

Is the meaning of a Decibel different when applied to Voltage vs Watts?

If I have an amplifier that provides +3dB, or an attenuator that provides -20dB, then how do I know if that applies to Voltage or power? In other words, if I have a 0dBV signal and I run it though a ...
0
votes
1answer
28 views

High Energy Metal Halide Bulb Heat?

I am building a custom box from wood (around 14 inches by 10 inches by 10 inches) to encase 3 high energy Metal Halide Bulbs (400+ watt each). The box will be opened and closed intermittently, ...
2
votes
2answers
157 views

How does a USB C port provide the power to charge laptops?

I've heard about laptops such as the new Chromebooks that are charged via a wall charger that connects to a USB-C port. I'm quite happy that this will supposedly standardize laptop chargers but I'm a ...
0
votes
0answers
58 views

What can I do to make this output usable electricity?

I built a generator having this output,the test load was 47 ohm, output reading was almost the same when on AC or DC setting on the millimetres. The generator was built with one goal, to generate ...
0
votes
0answers
21 views

Creating a pulse when the circuit opened and closed [duplicate]

I would like to send wake up and halt signal to a linux board. I just want simulate the power button on the board so I will replace it with a circuit. So: When I the car's ignition line is on it has ...
0
votes
1answer
57 views

ZYNQ ZC702 measurements of current

I need to measure a current with the osciloscope on a ZYNQ ZC 702 board and I do not know what shunt resistor should I pick. I am not so good at electronics so if some one can help me I would be very ...
1
vote
3answers
90 views

Line to Line or Line to Neutral voltage to calculate 3 phase power

I am confused as to whether or not I should use the line to line voltage on a 3 phase motor or the line to neutral voltage to calculate power? Would someone please be able to fill me in, and possibly ...
1
vote
1answer
71 views

Request for guidance on sources to help me figure out how to do simple thing

I have 9 3w leds (white) and 2 1w leds (blue). I have one led driver with sufficient output to drive only the white leds (either in series or parallel.) Therefore, I figured I will get a separate ...
0
votes
4answers
159 views

High power PCB to PCB connector names?

Trying something new out, I'd like to make an 'attachment' PCB that will slot into my mother-PCB, and all the questions here have said to use a kind of edge-to-edge connector or a ribbon connector. ...
0
votes
0answers
96 views

Is wireless power transfer by induction at 60Hz possible, or does the frequency need to be changed?

I want to build a wireless power transmitter that works over a very short distance. Can I use my line voltage(120V at 60Hz) through the primary coil to induce voltage into a secondary coil about 1/4" ...
0
votes
0answers
52 views

voltage and current amplifier

voltage amplifier does voltage amplification current amplifier does current amplification Is there something like power amplifier or power amplifier is just same as current amplifier?
-1
votes
1answer
54 views

Switching between different batteries!

I Have got a project wherein I have to achieve this! Please neglect the charger set up for my block diagram. Since I am a newbie to electronics, I am unable to get any idea how I would switch ...
1
vote
3answers
90 views

“Efficiency” of Switching Power Supplies and Theoretical Energy Loss

I have heard that switching power supplies that convert, say, 110 VAC to 12 VDC, are very efficient. I understand that the power transistor that is regulating voltage is either on or off and spends ...
0
votes
2answers
83 views

Best way to regulate 9/12v down to 5v and 3.3v

If my source is 9 or 12v should I first us a linear regulator to step it down to 5v and from the 5v use another linear regulator to step it down to 3.3v? The 3.3v will be going to a micro-controller ...
0
votes
1answer
30 views

Rise time and fall time calculation of an integrated switch?

Following the analysis regarding the selection of buck converter for my application (Buck converter efficiency Vs load current:). Now I am trying to estimate the power dissipated in the integrated ...
0
votes
3answers
71 views

Push power assisted trolley with one finger

I recently saw a demo. One man pushed a power-assisted trolley using only one finger. The trolley was loaded with ~40kg stuff and it started from standstill on a up-slope when the man pushed it using ...
0
votes
0answers
49 views

Can power be extracted from a cable that is supply something else with power

If a cable is supplying a TV with 200W, is it possible to somehow wirelessly tap into some of the power flowing through the cable? Would it be possible to extract enough to power something like an ...
0
votes
1answer
50 views

How to power Arduino, BeagleBone, and Stepper motors from a wall outlet? [closed]

I have a project that has an Arduino, BeagleBone Black, and a pair of stepper motors. The Arduino needs 9-12V and at least 250mA with a 2.1mm plug. The BeagleBone needs 5V and at least 1.2A with a ...
0
votes
1answer
47 views

Powering 3 DC devices from one outlet

I have be trying to research how I would go about powering 3 Raspberry Pi devices using only 1 outlet. The raspberry pi require 5v and a max of 2a. I think I know just enough about electronics in ...
-1
votes
2answers
104 views

Is 20 watts of electricity dangerous?

I have a few circumstances which invlove someone being shocked with 20 watts of electricity and whether it would be deadly. So here they are: Would 1000 volts at 20 miliamperes of AC (2MHz ...
2
votes
1answer
58 views

Computer Power Supply to bench top theory

I want to use my Corsair 430CX as a benchtop power supply to do small circuit work. I am fuzzy on the theory however when it comes to the amount of amperage that the rail can support. It worries me, ...