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Questions tagged [power]

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

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6 views

Power supply and PWM for brushed 24V DC motor

I've got a 24V motor with these carachteristics: -voltage: 24VDC - rated speed 2750rpm - Output: 200w Rated current: 10.9A I want to use it for a watchmater lathe, so I need to control the speed, ...
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0answers
13 views

How to increase low voltages modified AC Sine wave up to 220 VAC with 0.25 Watt?

I am working on Multilevel Inverter and successfully achieved modified sine wave with 7 level, that is much better according to my requirement. But the problem is output AC voltages is too low which ...
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0answers
8 views

Is this correct way to connect chassis ground to digital ground?

I'm currently working on a PCB and I'm not sure how to connect a digital ground and ground chassis. The picture shows the PCB layout where you can see the 3-pole power connector (L, PE and N). Pin 2 ...
1
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2answers
70 views

Prickling sensation in feet while near electric cables - should I worry about this?

I noticed that I have a prickling sensation in one of my feet near one of my power cables. This doesn't seems to happen next to other cables. If it matters: 2 computer and 2 screens take their power ...
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1answer
50 views

Warnings about power supply in EAGLE

So I'm using EAGLE for the first time, and I have zero experience with any EDA software. I've completed a schematic and would like to proceed to design the board layout, but I am stalled by these ...
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1answer
54 views

Are watts consumed in wireless electricity?

If I put a transistor on a coil of wire connected to a 120v AC circuit, and made it so my toaster was now wirelessly powered, if I turned the toaster on would it consume watts that are able to be ...
0
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1answer
48 views

AC input not matching DC output

I know this might sound stupid but it has me stumped. I am trying to calculate the average AC power input required for a few electrical devices which will be connected to a generator. The issue I'm ...
3
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2answers
106 views

RTC Power Switch for Raspberry Pi

I have done a lot of research on how to design a circuit to cut power from the pi after a safe shutdown and then turn it back on at a certain time. I am using a DS3231 RTC with an active low ALARM pin ...
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1answer
64 views

PoE and Adapter Power Supply Design

I am designing a power supply cicruit. The circuit will get it power from PoE (preferably) and external adapter (7 - 12V). For ...
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2answers
69 views

How to produce a certain amount of volts and amps? [duplicate]

I assembled this mini tesla coil kit and the instructions say to plug it into a power source that's 15-20v 2amps. I'm just wondering how do I do that? As in how do I make something that produces this ...
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2answers
50 views

How to derive voltage applied to an antenna, where transmitter power is known & identical tx/rx antennas are used with known gain/impedance?

Question: Imagine a transmitter + transmitter antenna with the following characteristics: 433Mhz transmitter transmitting 10dBm Into an impedance matched (50 ohms) antenna, omni-directional, 3dBi ...
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0answers
83 views

IGBT failure and protection

I have a 3-phase bridge rectifier (shown below). I am using an IGBT (STGE200NB60S) to limit the inrush current from the capacitors at start up. I also added the NTC thermisters to help with the inrush ...
2
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1answer
62 views

What to do with USB 3.0 ID pin?

I'm working on a simple front I/O board that connects to a PC motherboard. There is a standard connector in the "Intel Internal Connector And Cable Specification" that give a pin-out table of the ...
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0answers
135 views

Is there a name for this kind of power cable? [migrated]

I really like these PC power cables with the flat, side-by-side wire instead of the fat round ones you usually see. I can't seem to find them on Mouser, etc when searching for "flat". Do they have a ...
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0answers
74 views

I need to know what this component is [duplicate]

I have a tester of CCTV cameras that indicates this component is failing and overheating and when connected to a load. The equipment does not work but power is consumed. After reviewing it ...
0
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1answer
33 views

Does a supergrid approach confront with distributed generation?

I have heard many times about supergrids and distributed generations (small scales generation connected close to the loads). In a supergrid scenario, a efficient and clean production of electricity (...
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3answers
43 views

Difference between lower and higher current rated ESCs and electric skateboard questions

I am starting a project and would like to build an electric skateboard. Here are the specs for the parts that I have gathered so far: a. Two 90mm wheels that each contain a built-in BLDC motor. The ...
0
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0answers
38 views

USB Charger is never connected to Ground [closed]

I have been troubleshooting issues with a device using a Micro USB charger. A Micro USB charging hub was used with multiple ports which created high amounts of noise. This was done simulate a noisy AC ...
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2answers
41 views

Maximum power draw density of digital ASIC

Given a process node (e.g. TSMC's 16nm FinFET+) what is the maximum power per mm2 that a digital ASIC can draw? Secondary question: Assuming liquid nitrogen cooling, what would be the bottleneck ...
3
votes
2answers
82 views

Simple soft power latching circuit for a microcontroller

I'm building a simple device with a microcontroller and I'd like to be able to turn it on and off using the "hold a pushbutton for 2 seconds" trick that is found on so many consumer devices nowadays (...
5
votes
2answers
326 views

Why is the Active/Real Power Rating So Low for This Relay?

I'm trying to select a relay for a IoT project that will control a water boiler. I took a look at the HF32F-G relay, but some of the specifications in the datasheet weren't making any sense to me. ...
10
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4answers
3k views

What is the maximum voltage that silicon can handle?

Today, in a race for efficiency, we have moved from transformers to switching power supplies. Almost all PSUs were designed for single-phase low-voltage operation (220Vac/310Vdc in my country). I've ...
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0answers
11 views

Is using a shielded industrial cable a bad practice when used as an outdoors AC mains cable? [migrated]

As a part of a project I have noticed that some are using this cable for powering a smartphone on the top of a 120 meter mast. This cable goes from the ground all the way to the mast to power the AC/...
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3answers
153 views

What makes same wattage led light bulb brighter than the other? [closed]

I noticed that one 10 W LED light bulb was 800 lumens and the other 1000. Both were warm white, 4000K, 80 CRI. What exactly makes one brighter than the other?
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2answers
60 views

IEC vs. UL current rating

I was doing a search on Digikey for some power entry connectors and noticed that many of the connectors are rated 10A by IEC standards and 15A by UL standards. Why is there such a large difference ...
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1answer
104 views

LEDs dim as more turn on

I have built a device that consists of 10 PCBs connected by a backplane PCB. Each PCB contains various logic gates and a varying number of status LEDs for debugging purposes. Never before in my life ...
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2answers
20 views

Can you discharge a 3s LiPo battery from both its main plug and it’s balance plug?

So I’m building a quadcopter, and I want to be able to use the same battery to power both the escs and the flight controller. However, the escs are connected to the PDB which is connected to the ...
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1answer
43 views

Alternatives to Large Transformer or PSU for Driving DC Heater

I have a 3D printer heated bed, instead of 3d printing I want to use it for reflow soldering. The bed is intended to operate at 70c, using 12v or 24v. It can be wired in series or parallel depending ...
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0answers
25 views

Peltier refrigerator module [duplicate]

In tec1-12706 module power supply given 12v 6 amps..but i connect at 12 v 4 amps and 12 v 3 amps transformer paralleley..but cooling is insufficient.. please find the problem.. anyone help to find the ...
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0answers
42 views

Voltage Rectifier Fails When Doorbell Button Shorts Inputs [duplicate]

I am working on a project that involves powering a 3.3V microcontroller off a doorbell transformer. The design uses a full-wave bridge rectifier (1) to convert the AC voltage from the doorbell ...
0
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2answers
49 views

How to compare mAh to Watt hours?

I have a laptop with a battery described as: 3 cell Li-Ion 57Wh I would like to know how this compares to a powerbank with 26500 mAh capacity. How do you perform these kind of comparisons? What ...
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0answers
18 views

Finding output SNR using Noise figure

am trying to solve this question below: So I did find the system's overall noise figure to be 2.3 = 3.68dB, and you are more than welcome to verify it. However, my problem now is to find the output ...
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0answers
39 views

Powering audio codec below recommended spec

I'm working on an audio project where I intend to use the PCM3060 audio codec (datasheet here). The datasheet says that the chip takes two power inputs : Vcc (Analog supply voltage) @ nominal 5V (...
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2answers
109 views

Do resistors consume reactive power?

I encountered this problem in one of my books where the problem asked to find the power loss in the core of an induction motor. I worked through the problem and I found the current as in the picture, ...
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3answers
81 views

Power of audio amplifier not matching specifications

I have a Cerwin-Vega CV-2800 audio amplifier which is rated for 600 watts at 8 ohms, 900 watts at 4 ohms, and 1400 watts at 2 ohms. I also have two PWR247T-100-1R00F 1 ohm resistors rated for 100 W; ...
-1
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3answers
146 views

Change laptop 5.5mm barrel connector [closed]

I'm looking to replace the female 5.5mm barrel jack connector on my laptop with a female USB C connector. The replacement USB C port need only provide power and nothing further. I'm not sure how to go ...
0
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0answers
34 views

Power through d-sub cable

I want to use a 15 position d-sub cable to package together both data and power lines running between two systems. Three of the lines in the cable will carry a load of 1A. I need to use an HD15 ...
0
votes
1answer
65 views

How can I measure my smartphone transmitted power? [closed]

I was wondering if I can measure my phone's transmitted power with an SDR by tunning in the transmission bandwidth but then, I'm not sure how to know whether this power is coming out of my phone or it'...
0
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1answer
55 views

Can a rocket igniter rated for 12v and 3 amps be powered with a 4v battery at 9 amps?

I have a rocket motor igniter that says it requires a 12 volt battery at 3 amps. Since power is I x V, and power is really what heats up the wire that starts the igniter, is it possible that I could ...
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votes
2answers
64 views

How to get Convert DC to AC for higher frequency with H-Bridge? [on hold]

Require High Frequency AC supply (300 V, 1-2 kHz), as of my knowledge increasing frequency AC-AC is hard compare to DC-AC. So I decided to input DC and get AC of 300 V, 1-2 kHz. Please help how to ...
0
votes
2answers
45 views

Using OR controller TPS2115A

I have put together a circuit with TPS2115A, it's feeding a camera from two 5V 20Ah (USB) power banks. The IC (TPS2115A) is used in automatic mode, i.e. whichever supply is higher is sourcing current, ...
1
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1answer
79 views

How can I test the maximum safe current I can put through an electrical switch?

Firstly, apologies as I'm very new to electronics! I'm converting an old broken Atari 2600 to be an enclosure for my ODroid UX4 single board computer. I thought it would be nice to be able to run ...
1
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3answers
58 views

Need help choosing a power supply for a breadboard [closed]

Hey i want to (in the long term) start experimenting with remaking modules from old analog synthesizers. For example remake an oscillator from a Minimoog or a chorus from a Roland Juno-60 or something ...
2
votes
3answers
84 views

Dual power supply with two boost converters

I currently have a dual power supply, that supplies +/-15V. One -output of the PS is connected to the other channel's +output (GND). Now, the problem is that I need +/-50V. I bought two step-up boost ...
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0answers
49 views

Is there a cost savings associated with 3 phase power at the same device power requirement (kW)?

I am a Mechanical Engineer looking into purchasing an annealing furnace and have seen that some operate on single phase power while some operate on 3 phase power. I've done some research and have seen ...
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1answer
67 views

What voltage does a laptop provide over USB C?

I have read a bit already about USB C specification. One thing is not clear for me though. Please take a look at this picture: A device with profile from 1 to 5 can provide a higher voltage on the ...
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0answers
46 views

Power calculation for given load

Peak Load Normal/Actual load Currently available 300kW 180kW 200 Amperes The system is currently running on 200A connection ...
2
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2answers
55 views

Exascale Supercomputers Power Consumption

I don't know if its the right place to ask. I have read a lot of articles about exascale and found out that it may consumes approximately 20MW power envelope. Is it a daily basis or a yearly basis or ...
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0answers
32 views

Brick SMPS power supply issues

I'm working on a system comprised of two boards (power board, screen board) powered either via European outlet (220v 50Hz) or a LiPo battery. Power handover is achieved via an autoswitching MUX that ...
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2answers
42 views

Problems extending a 12V power lead to an RGB-LED strip

I need advise on the following problem: I am connecting a 5 metres WS2812B based RGB-LED strip to an extension cord. This is a 12V version, where two LEDs are coupled in terms of their addressing and ...