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Questions tagged [power-supply]

An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

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1answer
50 views

Cordless dremel hard wire [on hold]

4.8 v cordless dremel. I've got a bunch of different supplies laying around all different volts none exactly right what would be most comparable battery = 4.8v-.7Ah. Supplies I have close maybe ...
1
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4answers
17k views

3 phase 4 wire supply advantage

What are the main advantage of using 3 phase 4 wire supply over 3 phase 3 wire? What is difference between both? I have seen a energy meter using 3 phase 4 wire power supply and i am not getting why ...
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0answers
57 views

Voltage regulator not outputing desired voltage and extremely hot

Now that I have understood how to connect my transformer to output 18V, I now have a huge problem with heat and wrong output voltage. I also smells and you can feel the heat. Here is my design ...
0
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3answers
955 views

Suppressing contactor coil inrush, is this possible?

http://www.kvc.com.my/EnterpriseChannel/SharedResources/Datasheet/0/?ProductId=1000066755&Filename=SCHNEIDER-LX4-FH024.pdf I am trying to operate a 24VDC coil with an inrush of approximately 30A, ...
13
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3answers
1k views

Will linear voltage regulator step up current?

I have a regulated 9 volt 300mA power supply I want to step it down to 5 volt using Linear Voltage Regulator LM7805 , I want to know how much current can I can draw at 5 volts, will it be 300mA or ...
2
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1answer
44 views

Powering LED Strip with the right supply

I am currently working to power a very large project. I am in the US and am planning to run some large amounts of 5M (16.4') 12V 5050 RGBWW Supernight 300 LED/strip (EBT459). I calculated the length I ...
0
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1answer
63 views

Raspberry PI Zero - 5VDC output current?

I was planing on using a Raspberry PI Zero W for å smart lamp project with WS2812b LEDs, to avoid separate power supply for the LEDs, my plan was to power the LEDs from +5VDC on the RPI ZW. The lamp ...
0
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0answers
50 views

Ampacity Testing

Just a simple understanding question. If I obtained a DC bench power supply that has a current limit, could I test the ampacity of a wire by connecting said wire across the terminals? So when I slowly ...
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0answers
23 views

High side N-channel Mosfet Switching output port short circuit protection

I have designed High side plus low side isolated combined N-channel switching using mosfets for high power switching through Mosfet. The power handling of the design is 24v/70Amp. The design is ...
0
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0answers
21 views

Matching Stepper Motor Driver with Power Supply

I recently purchased a nema 34 stepper motor and a DQ860MA stepper driver to use in a CNC router. I'm looking at purchasing a power supply, but I'm a little confused about the driver specs. The driver ...
2
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3answers
92 views

Why is a laptop power supply output voltage different from its battery?

I hope you will not mind answering. This question has long been on my mind. Normally, the adapter output voltage is higher than that of the battery. In my laptop's case, the output voltage of the ...
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0answers
49 views

Power supply for led strip [on hold]

How can i calculate the voltage that the led strip want to work and how can i design circuit to supply this led strip with suitable voltage . Thanks all
0
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1answer
337 views

Lithium ion battery protection IC not able to drive MOSFET

I have integrated the TP4056 charger design into my PCB. The problem is that when I connect the battery at the battery terminals, I am not able to get the voltage at its output pin. The circuit can be ...
1
vote
1answer
108 views

How to design for electrical connection for a food dryer

I am on this project in building food dryer to dry 2 kg fish cracker maximum per use. Based on the calculation, I only need to use power of approximately 60 watt for the heating to achieve the energy ...
8
votes
7answers
74k views

Why does the USA use 110V and UK use 230-240V?

Why does the USA use 110V and UK use 230-240V? What are the advantages? Explain me with calculation. Why do they use different frequencies like 50Hz, 60Hz? What is the reason?
2
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1answer
114 views

Generator Dropping characteristics

I was studying about Droop characteristics. I came across the following flow path for a thermal plant Plant is working at 130MW and 50Hz Due to some load increase, frequency of the grid drops say 49....
3
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1answer
122 views

Safety Capacitor Selection

When selecting an X2 safety capacitor what must be taken into consideration. There are only a few types of capacitance ranges and seem to be chosen based on voltage rather than capacitance. Take ...
1
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2answers
112 views

Choosing Component / External Power Supply & Arduino 3.3V

I've made a prototype for a small music player using arduino pro mini 3.3v. My question relates to powering the device. I want to be able to use it outdoors, and eventually power it "straight from ...
0
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1answer
101 views

Powering Atmega, DAC and Bluetooth in Car

I'm looking for a proper power supply schematic which would fit my needs and would have all required protections (overcurrent, overvoltage, reverse current, etc) for use in car. I want to power Atmega ...
0
votes
1answer
64 views

How to get 3.8Volts and 3.9Amps from power supply to drive peltier TEC3104 [on hold]

I am trying to heat the TEC3104 peltier to certain temperature. Link for the peltiers. So for this peltier may I know how to I get the operating current and voltage from a power supply. Operating ...
0
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0answers
22 views

Which power source/elements are better for a spot welder?

I'm going to build a spot welder for the batteries of my RC models, but started thinking which power source is the better choise: 12V car battery with higher start current (500A+) Transformer which ...
1
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2answers
280 views

USB type-c power supply (up to 20V 5A) from DC source

I have a custom made 5s power bank (30 x 18650 cells) and I want to make a power supply to charge my laptop using this power bank. It's not a big deal to make a 5V charger because I just have to hard ...
0
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2answers
38 views

Connecting an Arduino to Raspberry Pi

I'm trying to connect an arduino with 3 sg92r servo motors on it and an RPI with and lcd and the serial of the arduino connected to it. They are both connected to a power supply with 9v/1A and 5v/2....
2
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1answer
44 views

Common ground on a switch mode power supply

I've got a switch mode power supply and I have a question on the grounding of the PCB. Documentation on the PSU can be found here: https://docs-emea.rs-online.com/webdocs/1621/0900766b81621ef9.pdf ...
0
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1answer
32 views

Switch ON/OFF in MAX1709

I am designing a project where I'm going to use the MAX1709 step-up converter. There is a possibility to switch the converter ON/OFF with the help of ONA/ONB inputs, but according to schematic in the ...
2
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2answers
143 views

Power Supply Design Help- failure at higher currents

I am trying to design a 60V 6A supply to power a power amplifier. Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around: simulate this circuit – Schematic ...
5
votes
1answer
118 views

Full bridge driver capacitor ringing problem

This is my first time designing a full bridge driver. I am experiencing problems with ringing on the output. I have made a pcb for it. This is a picture of the top side of the board. Backside Input ...
0
votes
1answer
58 views

USB and coin cell battery switching

I'm trying to do a simple, low power, low cost power "switch" for a custom board (I know, it will be complicated). The device will be powered by default by a coin cell battery (3V3 and lower) and can ...
0
votes
1answer
110 views

charging lithium ion battery of 3.7v

I have a device in which I have used 3.7v of the lithium-ion battery for power supply and for charging this battery, I am using a tp4056 module. when I connect a battery to tp4056, battery fully ...
0
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0answers
60 views

PCB dual LED emitter, TIA and voltage regulator (beginner)

Does this PCB look good for this operation? The schematic is attached. I have a voltage regulator connectected to an LED emitter. Voltage regulator to TIA . TIA then is attached to active high pass ...
0
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2answers
128 views

220 VAC/110 VAC to 24 VDC

I'm trying to understand how to build a battery charger. I need to convert from the usually european 220 VAC to 24 VDC but also from USA 110 VAC to 24 VDC like the normal chargers, to adapt it to the ...
0
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3answers
142 views

Is Joule Thief a constant current source?

Wikipedia describes Joule Thief, shown below, as a circuit that can be used to provide constant load even when voltage of a battery decreases. At least that's what I think the article means. simulate ...
2
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5answers
389 views

Cheap 12V to 5V DC-DC converter for PCB? [closed]

I want to clarify: I understand there have been many questions on this site regarding this same voltage conversion; however, what I am asking is not simply how to convert 12V to 5V but how to do it in ...
0
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1answer
56 views

Desktop PSU registering signal from 220ac input [closed]

Question: Do "current+old" generation desktop pc's have any built-in means of registering a signal that is modulated on a (220v) AC power output? Application/context: Suppose your energy company ...
0
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1answer
110 views

Do you know how to add VEE and VCC power strips to op-amp in Cadence that will be fit for simulation?

This is the built in Cadence OPAmp. I need to add A capacitor to the VCC wirep and Ground the VEE wire however, there is clearly not a VEE or VCC on this op amp. Also, I know that I could manually ...
8
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1answer
1k views

Why must this DIY lab bench power supply be powered by an AC supply?

Technical Specifications: Input Voltage: 24 V alternating (max) Input Current: 3 A (max) Output Voltage: 0 - 30 V, could be regulated continuously Output Limit Current: 2 mA - 3 A, could be ...
1
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2answers
108 views

Motor driver / power supply selection issues

I'm planning on running two identical stepper motors controlled by arduino. The specs are: Bipolar RMS current - 3A Bipolar RMS voltage - 3V I plan on running them at very low (<60) RPM (the ...
0
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0answers
40 views

Power source for a DC 24V Motor

What is considered a proper power source for a DC 24V Motor, Geared Motor Adjustable 2-1500RPM, specific to watts and amperage? I'm using the motor to power a guitar pickup winder that has variable ...
0
votes
1answer
52 views

How to chose between 9V or 12V (or others) DC power supply [closed]

I see a lot of devices working either with a 9V DC input or a 12V DC input, usually provided through a DC jack connector. I was wondering about advantages and/or inconvenients of both voltages. ...
0
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0answers
41 views

What power socket for a blue P+N+E plug with an amperage of “2 x 13”?

apologies for the potential stupid question but I've never seen this before. I've got a second-hand bit of kit which comes with, what looks like, a normal blue P+N+E plug however stamped onto the ...
0
votes
1answer
43 views

Splitting laptop power supply to charge 3 NiMH battery packs, how to protect from overcharge?

I have a 20V 2.25A laptop power supply that i want to split 3 ways to charge 3 X NiMH battery packs simultaneously (5000,2000,2000 MAh each @ 7.2V). My plan is to use 3 of these XL-4015 dc to dc ...
1
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1answer
51 views

Optocoupler 5V to STM32F407 3.3V

I have to connect 8 optocouplers as shown in the picture with STM32F407 MCU. These are giving 8 digital signals to the MCU. The supply voltage at the outputs of optocouplers is 5V DC while the ...
0
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2answers
33 views

Replace 24VAC 20VA transformer with standard power supply

I have the following transformer (source): Sticker reads: Pri: 120VAC 60Hz 30W Sec: 24VAC 20VA I want to replace it with a standard, power supply without screw ...
1
vote
1answer
52 views

What to consider when powering multiple devices in parallel?

Briefly about my background, which might inform the question. I'm currently self-educating myself on some electrical engineering on-the-job. I'm learning from Art of Electronics and some other ...
0
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1answer
576 views

How to power a fan from capacitor after main power is down?

I power a 12V 0,84 W fan from a 5V power supply through MT3608 step-up converter. I would like the fan to work for about 5 seconds more after main power is down. Is it possible to do it using a ...
1
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0answers
20 views

Which power converter topology has higher benefit of EMI/EMC?

Which power converter topology can be best suited for EMC compliance for small power converter to be used in LED lighting products. In my context I'm using a 5W non-isolated AC-DC converter which is ...
1
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3answers
3k views

Precision Power Supply / Elektor, December, 1982

Since this PSU was published by Elektor I assume that some of you might heard or read about this project. http://www.retro.co.za/zs1ke/projects/PrecisionPowerSupply/PrecisionPSU-Elektor-Dec-1982.pdf ...
0
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3answers
123 views

water wheel power generation

I have a 5000 watt, 3600 rpm 60 hz generator.I plan to connect it to a 1500 watt baseboard heater. Assuming the water wheel can supply sufficient power to the generator, how will water wheel rpm ...
0
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1answer
53 views

My Anet A8 power supply blew up

A few days ago, I received my Anet A8 Power supply (240W, 20A) power supply in the mail. After the second time plugging it in, it blew the fuse and the rectifier. I found a blob of solder connected ...
0
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1answer
114 views

Standard 12 Volt DC fan for PC: how much AC ripple can support? Does ripple increase noise?

I want to know which is the mechanical effect to run a DC 12V brushless common fan with a very basic and poor power supply (just a diode plus a low value capacitor, no regulation at all). In principle,...