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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
0answers
15 views

Power staging design with DC plug and charger

I want to build a device that contains a Raspberry Pi and a STM32F103 based MCU. It should run either with an external 5V power supply or with a built in LiPo battery. To keep things simple, most of ...
0
votes
0answers
44 views

AC voltage at the output of SMPS

We have 230 VAC power supply in our lab.A chemical earthing is done for this power supply. I have connected a SMPS (LRS-35-12) to it. The Output of SMPS is connected to a load of maximum 2A. I have ...
0
votes
0answers
31 views

Regulating 4s 18650 battery to 12V or use 5s instead?

I'm working on a power distribution board which is going to distribute to several other devices/boards. Due to the high current requierment of the all the devices in total (about 29A - mix of 5V, 12V, ...
0
votes
0answers
33 views

What would be a good constant source of power for a motor? [closed]

A couple of friends and i want to build an orrery. We are having trouble in figuring out what would be a good power source for our motor. We are planning to use one motor to run the central gear ...
0
votes
1answer
32 views

What are my options for supplying power to an M140 M-Type JAPAN 2+ W laser diode running off of a 5A constant current laser driver? [duplicate]

Background: I am building a laser that is running off of an M140 M-Type 2+ W 445 nm laser diode and an adjustable constant current driver. Here are the specifications for both the driver and the ...
2
votes
1answer
87 views

Need some help designing a mains frequency converter (220v/50hz input, 220v/60hz output) for <$200USD

My main limitations here are with the amount of power needed, and of course the price. What I'm trying to do is to run a clothing dryer from the USA in another country, without burning out the drum ...
0
votes
0answers
37 views

How to safely switch a big inductive load with a Triac using a capacitor snubber?

I am building a Spot Welder with a big powerful transformer. I have to switch a big inductive load of 70mH (input of a transformer) The switching will be done with an SSR (Opto Triac Zero crossing SSR-...
1
vote
0answers
39 views

Issue with powering MP3 module with Amplifier

I'm not a electronics engineer/student, so please escuse me if my query sounds a bit naieve. I have a Mp3+FM module (link) which I can power with a regular micro USB charger(or desktop USB). As the ...
0
votes
2answers
76 views

230vac / 5vdc power supply design

I am making my own basic bench power supply mainly for testing logic gate circuits, relays, flip flops etc, that I can move around to different locations. The circuit of the entire schematic will be ...
0
votes
1answer
57 views

Drive a 3w led with a 18650 li-on battery

I'm getting crazy trying to figure out if there is any easy way to power up a SINGLE 3w led 3w - Forward Voltage: DC 3.2-3.4V - Forward Current: 500-700mA with a ...
0
votes
2answers
68 views

MOSFET as Power Switch Issues

I am trying to use a N-channel MOSFET to toggle battery power going to a 5V voltage booster using the circuit shown in the attached image. Battery voltage is 3.7V and the gate voltage is 3.3V. High ...
0
votes
1answer
60 views

How to choose the right potentiometer for dimming a LED

I have a reading lamp from IKEA. It has a bright LED. Too bright for my taste. So I inspected it and it is composed of a DC power supply unit that outputs 7V and a maximum of 3W. The LED unit is ...
2
votes
4answers
156 views

Converting Christmas Village from DC to AC

So this was the year we bought a AC-powered O-gauge Lionel train and a battery-operated village to add to our Christmas tree decor. The problem, the village eats batteries like a kid eats cookies. ...
1
vote
2answers
29 views

No negative terminal in power supply

I'm working on a project that relies on the Roomba vaccum cleaner's reference document (shown below), there are two positive terminals and 2 ground terminals. I'd like to understand: Why there isn't ...
0
votes
0answers
31 views

SMPS Flyback transformer selection

I am trying to design a SMPS for a project (I have to make a custom one for integration purpose). This SMPS have universal input (85-265V AC at 50 or 60 Hz) and an output of ideally 53V (but it can ...
2
votes
2answers
65 views

Help understanding power ratings in optocoupler datasheet

I want to understand this the datasheet for the Everlight EL817 optocoupler but don't know what is the maximum power can the output hold. I see an optocoupler as a kind of switch that closes a ...
-3
votes
0answers
34 views

how do create a circuit that allows two power souces when one or the other is off? [duplicate]

I am trying to build a circuit board where the main battery power system is off and the temporary is used. Also when the main battery power is on the temporary is off. I want to turn my device on when ...
0
votes
0answers
48 views

This is a basic question but I'm confused please help [duplicate]

I need to power my circuit. I have a power supply of 12v 8.5 amp my circuit needs 12v 1 amp. What do I need to do?
0
votes
1answer
43 views

Can the location of the inductor on the board affect the operation of the microcontroller?

I have a voltage regulator, based on LM2596, in its circuit there is an inductor on 33uH. The question is, can this inductor be a source of interference? Next to him, I plan to place the Atmega328P ...
1
vote
1answer
38 views

Typical Amplifier Output/Input Curve

I apologize for the extremely basic question, but I want to be sure. Ideally, an amplifier should have a linear output power to input power relationship. However, in most amplifiers (say a class AB ...
1
vote
1answer
26 views

Considering power loss in a simple series connection due to cable

A friend and I are struggling on a simple electricity exercise: A heater is connected to a \$U = 230V\$ power network over a copper cable. The cable has a cross-section of \$A = 1.5mm^{2}\$ and a ...
0
votes
2answers
68 views

What is the effect on kWh if the power company reduces line voltage to a residence? [closed]

We just received our power bill and it is showing a 30% rise in kWh for the past month. Nothing has changed in our home. We were even gone one full week in the month. To make it more interesting, ...
0
votes
1answer
64 views

Heat sink via holes under voltage regulator LM2596

I am designing a board with LM2596 voltage regulator (12V/5V 3A) I want to make heat-removing holes under the microcircuit. For this, I decided to use via holes. The board has two layers. The ...
1
vote
0answers
45 views

What factors should I consider when choosing a high amperage power supply?

I've searched around, but I haven't found an answer to this particular question yet. I'm building an elecromechanical project which requires somewhere around 60 Amps at 12 Volts. While this may not ...
0
votes
0answers
29 views

Calculating max weight capacity of brushless motor [migrated]

I am having trouble determining the maximum weight capacity a motor can handle. I provided the specs below. The calculations are for the top row or the 580KV model. So to start off,I'm only taking ...
0
votes
1answer
69 views

220/240 to 200v dc power supply

I have a 12kva (10kw) ups and I want to power it from a 24v battery bank. The dc input is 192dc input from the battery side. I was thinking off getting a 24 to 220 Inverter and rectifing it to output ...
1
vote
1answer
40 views

Installing Samsung electric range oven on 110V [closed]

I just purchased a Samsung electric range oven, NE59M4320SS. It has a connector cable, https://www.bestbuy.com/site/smart-choice-6-range-cord/8929671.p?skuId=8929671 As you can see the cord has 3-...
0
votes
1answer
67 views

why the power absorbed by RL load in half wave rectifier is I^2R not V^2/R nor VI

why the power absorbed by RL load (resistor in series with inductor) in half wave rectifier is I^2R not V^2/R nor VI. V , I are with RMS value.
1
vote
2answers
53 views

Powering an onboard car GPS tracker

I made a car tracker (a GPS/LTE module connected to an arduino that communicate to my web server) to log gps positionning data. I’m planning to use this to track my new car in case it gets stolen. My ...
0
votes
1answer
73 views

Ampere requirements [duplicate]

I read question from someone who was having monitor with 90 W power, 19 V and 3.32 A rating. When calculated using volt and power the amp came out to be 4.74 A. I didn't understand why is there ...
0
votes
2answers
36 views

Overvolting Peltier

I currently have a 12v 6A Peltier bolted to 2 heatsinks, with 2 separate fans. The old PSU I used for this system went kaput, so I would like to find a temporary replacement before I buy a new power ...
8
votes
4answers
788 views

Is the link between the earth/chasis terminal and the utility transformer established through a dedicated wire or the soil?

I was following a tutorial on power supply transformers and at the very beginning I have encountered the following illustration: I added the names TG and HG for the LV transformer ground and the ...
0
votes
1answer
55 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
228 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
86 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
64 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
107 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
30 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
51 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
67 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
112 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
158 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
36 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
28 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
60 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
61 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
23 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
54 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?...