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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.

0
votes
1answer
63 views

Power bank multiple output currents

I've been working on a simple power bank project that's been built using Li-ion batteries, the batteries are rated 3.3 V. I've implemented a charge controller which can efficiently charge the power ...
24
votes
6answers
3k views

Why do high-voltage transformers need oil?

Someone told me that high-voltage transformers need oil because it prevents arcing. However, in terms of dielectric breakdown, isn't air the strongest? I remember from classes in college that as the ...
6
votes
2answers
244 views

Reverse voltage protection for Analog Devices’ family of protection controllers

After going through several datasheets for devices from "Analog Devices’ family of high voltage surge stoppers, overvoltage protection, overcurrent protection, and circuit breaker ICs", I found that ...
1
vote
3answers
106 views

Crowbar Circuit Resistor

I have a crowbar circuit which uses an SCR with 100mA gate current shown below. In order to use this resistor value at 100mA it would need to be rated for 60W. Obviously here the resistor will pop. ...
0
votes
2answers
117 views

LCD Backlight Control Circuit

I'm trying to control the back-light of a TC1602A-09T 16X2 Character LCD by using an output pin on a Teensy 3.2 microcontroller. This is the circuit I have at the moment: The LED- pin would be ...
1
vote
5answers
154 views

Would an AC induction motor rotate if the power factor were unity?

I know about active and reactive power as a big picture. Active power is what really does the job and the reactive power circulates back and forth in and out of the system. I also know the math behind ...
0
votes
0answers
11 views

Differential Power Analysis - Sizing LC Filter for High Power (100W) Applications, Expected effect on Variance

Working on a project where I am defending against side channel attacks on consumer motherboards, specifically power analysis. By monitoring the power consumption of a motherboard in real-time, an ...
-1
votes
1answer
34 views

If I use a 5A power pack for 3 led strips 2A will the power pack burn [duplicate]

I'm trying to make a light and I'm using 2A 12v aluminium led strip lights. But I need to know how to select the power supply for this. I'm using 8 led strips: 4 strips 2.5 feet 4 strips 1.5 feet ...
0
votes
2answers
56 views

How is load forecasting profitable to power companies

Let's suppose that a power company is using a software model 'X' to do load forecasting which can predict 24 hour ahead load with a MAPE of 5%. Now suppose that I've created a model 'Y' that reduces ...
1
vote
1answer
101 views

Latching power switch circuit

I am trying to understand: 1) how the following circuit works and more specifically how it turns on. 2) How to to modify it to get a hold on/hold off behavior instead of push on/hold off to prevent ...
0
votes
1answer
113 views

How does this power supply schematic work? [closed]

The above is the schematic for the power supply portion of a board. As a electronics noob, I find it highly confusing and hence would appreciate some help in unraveling this schematic. The EE13 ...
0
votes
2answers
167 views

In SMPS , why does peak current mode control have lower gain for inner loop compared to average current mode control?

This has been bothering me for a while. In some of the design notes of power management ICs , it is mentioned that peak current mode control has 'lower gain - wider bandwidth' inner loop compared ...
1
vote
0answers
50 views

Designing a +10 V -10 V +7 V DC power supply for audio equipment

I've recently purchased a tape recorder (Tascam Midistudio 644) that was very cheap because the previous owner had lost the power supply. The PS-M1 power supply that originally came with this unit is ...
0
votes
0answers
31 views

Voltage Regulator with Reverse Voltage

I have designed a simple PCB circuit board that is powered by either the 5V from a USB, or if a battery is plugged in, powered from a 3.3V and 5V regulator. I am no expert in electronics, but have ...
0
votes
0answers
67 views

How to Find Resistor for Maximum Power Transfer?

I honestly have no idea what is the best way to find RL for maximum power transfer in this circuit. What I do know, first and foremost, is that the RL resistor can be found as the Thevenin-...
1
vote
1answer
64 views

Please check my DC / DC schematic. ST1S40

I want to make a voltage down converter to power my controller (Atmega328P). Input = 12V / Output = 5V (3A). As a converter, I use ST1S40. My connection diagram I took the circuit from datasheet, ...
0
votes
1answer
27 views

Depletion Mosfet as current source to power load

I came acros the following application note for a Depletion Mosfet (https://www.infineon.com/dgdl/Infineon-Application_Note_Applications_for_Depletion_MOSFETs-AN-v01_00-EN.pdf) and i got intrigued. ...
1
vote
1answer
56 views

Sticking to high voltage DC Current

I heard that if you come into contact with a high voltage DC current, you will ‘stick’ to it until it is switched off. Why is this and how high does the voltage have to be for someone to ‘stick’ to it?...
0
votes
0answers
77 views

Calculating Required Bulk Capacitance

All, Lately I've been thinking more about bulk capacitance in my designs. Previously, I've been careful about part selection and placement for decoupling and filter capacitors during design. Once a ...
0
votes
2answers
36 views

The Relationship of Power and Heat to Length of a Folded Resistor

This question is a follow-up to a previous question of mine (The Relationship of Power and Heat to Length of a Resistor). We make heaters in our lab. They are 1.5 inches long and are made using 0.005-...
0
votes
1answer
48 views

Multimeter across Power Line voltage varies wildly

I'm building a single switched AC/DC Forward Converter and have reached to the point where I have steady o/p voltages and currents. However, I am not able to remove noise that goes back into the AC ...
0
votes
1answer
36 views

Copper cable current Gauge calculation

I want to calculate theoretically the current carrying capacity of a cable. I have 24 Awg cable, which is having 8 strands: the overall dimension of the cable is 1.27mm and each strands dia 0.15 mm ...
0
votes
1answer
49 views

Calculating the reactive and active power

This is probably an easy one for you. In the following circuit simulate this circuit – Schematic created using CircuitLab I want to calculate the active and reactive power in load R2-C3. I've ...
1
vote
1answer
60 views

Can a ground fault be caused by something outside the home?

Yesterday afternoon, I had a GFCI switch trip. It would not reset. I figured I had a ground fault. I left the home for a few hours and after I returned I was able to successfully reset the GFCI. The ...
0
votes
1answer
81 views

3 phase 12 V step down transformer

I need a 3 phase power supply for Lab purpose. Since using 220 V x 3 phase is dangerous, I'm searching for a three phase step down transformer and that seems not available. Am I asking something which ...
3
votes
1answer
157 views

Choosing a suitable power supply for a MOSFET driver chip

I would like to use the TC4427 MOSFET driver chip, in order to switch the current through the IGBT AUIRG4PH50S, which will be placed in series with a resistive load. The power supply providing the ...
7
votes
1answer
490 views

Identify Vintage Power Cord for 1980s Organ [closed]

I Recently acquired a Technics SX-C600 organ but it needs a power cord. Does anyone know what type of power cord I should get for this? My understanding is that this is a rare organ.
2
votes
0answers
21 views

Context of Li-Ion MnO2 “Cell Configuration” Specification

My application supports variable pack configurations: 4S4P, 4S6P and 4S8P. Each one obviously uses a different BMS profile, and other minor changes such as charge/discharge MOSFET and fuse selections....
0
votes
1answer
151 views

How to calculate the Temperature rise of PCB and its surrounding air from the power PCB consumes?

I am having a difficulty understanding some mechanism regarding heat generation from an electronic PCB (Printed Circuit Board) and its effect on atmospheric temperature. I don't know if this question ...
0
votes
1answer
58 views

Is the “Volt” a measure of force or energy consumption?

A little confusion on my part. I see that a volt is the SI unit of electromotive force as the Wikipedia may show. I also see that One Volt is defined as energy consumption of one joule per ...
0
votes
1answer
33 views

Microbit - Control an LED that is powered externally

this may be a bit of a noob question but I am trying to make a motion activated light with my Microbit. I have a 1W superbright LED and its clear the Microbit won't supply the current needed for this ...
0
votes
1answer
83 views

Embedded System power requirement calculation

How can I measure total power requirement of an embedded system which consists of a lpc2138 interfaced with various other components such as lcd, humidity sensors and temperature sensors. Also the ...
0
votes
2answers
32 views

Lower wattage of IR bulbs permanently

I have two 90w/12v infrared IR bulbs which is put into a r7s sockets. From thes socket goes in total four wires which is connected to our power supply. We have set two of the wires in serial so they ...
6
votes
3answers
1k views

What is the “maximum power” of an antenna?

I was reading the datasheet of an antenna and I came across the parameter "Max. Power (total)", measured in Watts. What does this stand for? Can it be measured to check that the datasheet is right?
1
vote
0answers
44 views

Inrush current limiter circuit for filament bulb - comparison

Context: A 12V power supply is switching on externally connected 12V filament bulbs. The power supply's load switch implements an electronic resetable fuse (13A/τ=15ms) in case of an external short. ...
0
votes
1answer
33 views

Does Camera Power Consumption Lower Without Output?

I have a camera with power consumption listed at 24 VDC +10% @ 1.5 A max. That same camera has a built-in output for an external light, 24VDC @ 750 mA max. Without the external light output, will my ...
2
votes
1answer
68 views

Coupling coefficient variation in Wireless power transfer

Question regarding WPT compensation topologies. I'm trying to make a inductive wireless power transfer system where the RX coil can move quite conisderably relative to TX coil and still transfer ...
0
votes
1answer
40 views

Power consumption for an in-wheel motor

I'm trying to estimate the power consumption of an in-wheel electric motor. I used the formula $$P = T\cdot\omega + K_m\cdot T^2$$ where T is the torque, ω is the motor angular velocity and \$...
-2
votes
1answer
46 views

Run a 12 dc power through telephony cable [closed]

I have a converter (120 AC to 12 DC) which is used for sending alert to outdoor through 30 meters telephony cable. My quistion is ( Is it harmful if someone touch the cable? the output can give up to ...
3
votes
8answers
3k views

54V 5A DC thru “regular” coax “TV” cable for use as a “poor man's” solar power cable?

In the effort of saving money without having to buy expensive solar cables (and because I have a lot of extra coax cable lying around doing nothing), I would like to use a piece of coax cable (that ...
1
vote
1answer
30 views

Calculating power drawn or ampere allowance

I just want to confirm the calculations for the following scenario. I have an equipment with the following specifications: ...
0
votes
1answer
94 views

a weird phenomenon with a 12V black & decker cordless drill [closed]

The background: I have a 10 years old 12V black & decker cordless drill, the batteries died successively, and I connected a 2 pin male plug try to use a PC power supply [PCPS] to run it. What ...
1
vote
1answer
77 views

Stabilizing IR Emitter/Receiver circuits

Need some help making these IR Emitter/Receiver circuits, and their power, more stable. Building a large, 8’ x 10’ LED art installation (in progress details included). LED Butterflies in a grove of ...
0
votes
1answer
51 views

Heating resistor power limit

This might be a stupid question but, what limits the heat power output of a heating resistor? Is it the temperature that the material can handle, or does the electrical power itself cause a heater to ...
0
votes
1answer
30 views

About parallel circuit [duplicate]

Consider a power source supplying 240 v 50/60hz 6amp I know that there is nothing like it but I chose that for my comfort of understanding now if I connect 15 loads drawing 240 v 0.35 amps in parallel ...
0
votes
1answer
42 views

Selecting the Power rating of resistor

In a circuit I design, there is a moment, when a capacitor should be discharged through a resistor. The power dissipated in the resistor has the format of the screenshot in the LTspice. Should I ...
0
votes
2answers
51 views

In AC circuit will there be a voltage drop or current drop [closed]

For reference purpose consider an AC voltage source of 240v 1amp and there are 3 loads connected to same 240v line one consuming 600 milliamps and another one consuming 300 milliamps.now if i add ...
0
votes
2answers
44 views

Dual rail power supply for audio needs to drive LED too, unsure of design approach

I have a +17V, -17V power supply for a headphone amp I am building, I would like an LED to indicate when the amplifier is turned on, but don't want to negatively effect the audio output by drawing ...
0
votes
1answer
73 views

Switching a USB HDD on and off

I have a PC which I backup to an external USB3 HDD drive from time to time, I manually connect the drive whenever I "remember" to do the offline backup. I don't want to keep it connected all the time ...
1
vote
1answer
45 views

Powering a Behringer MicroMIX MX400 - Car Audio Application [closed]

I am installing a car audio system that will have TWO aux inputs; one in the dash and one in the rear passanger seat are. I decided to purchase the Behringer MicroMIX MX400 mixer. The power spec for ...