Questions tagged [power-supply]
An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.
5,345 questions
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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 ...
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3answers
61 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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3answers
176 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 ...
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1answer
47 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 ...
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0answers
45 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
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0answers
18 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 ...
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1answer
64 views
How to get 3.8Volts and 3.9Amps from power supply to drive peltier TEC3104
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 ...
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2answers
37 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....
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1answer
43 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
...
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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 ...
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1answer
88 views
+100
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....
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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 ...
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5answers
356 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 ...
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1answer
994 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 ...
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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 ...
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0answers
58 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 ...
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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 ...
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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.
...
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0answers
16 views
power supply for vibrating motor [closed]
I have a small vibrating motor its a 12volt dc 100ma i'm looking for a power adapter with a on off switch any idea i'm not an engeneer nor electrition its scares me
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1answer
50 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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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 ...
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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
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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 ...
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 ...
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 ...
2
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2answers
141 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 ...
0
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1answer
98 views
Took 24V out of a 12V PSU to power a peltier module, the psu died [closed]
I connected a TEC1-12705 to +12V and -12V of a PC PSU (+12v rated 45A, -12v rated 0.5A) then the PSU died. I inspected the PCB and found no burnt traces. What could be damaged?
The IC of the PSU is a ...
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0answers
65 views
What's causing my 12V DC power supply to tick around 5-6Hz?
I have this lamp which runs off of a 12V DC power supply provided. There's a faint ticking sound coming from the power supply, sort of like the sound and volume of a watch tick, but it's happening ...
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
42 views
Igus Motor Power Supply [closed]
For my work I have to install a linear screw motor from the company Igus.
It will be control with the constructor controller Dryve D1 (Dryve D1 Doc).
I understood how to connect the motor, the ...
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0answers
58 views
Build tips: Underwater camera that sends images over a 3g/4g network [closed]
I'm looking to keep a small camera underwater and have it take a photo every hour, and then send this photo over a cell network to an email address.
I was imagining a small device powered by a ...
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0answers
24 views
Corsair VS650 PSU [on hold]
I owm a system with VS650 psu and a RX580 8gb.
Problem is, electricity in my area is not reliable at all. It goes out whenever it likes.
Fortunately I have 1kVA Solar Inverter.
Whenever the PC is ...
0
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1answer
67 views
Looking for STM32F4 Vdd 5V
I have to replace Renasas M30853 MCU with STM32F407 MCU in a circuit. The earlier MCU uses power supply Vdd = +5V as well as all the analog and digital circuit that is connected with it. How can I use ...
0
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2answers
32 views
Powering Multiple Arduino Nano
I'm looking to power 5 Arduino Nano devices and an Uno. I'm wondering if I can power the devices with one power supply. I know that I'll need to use the VIN pin with 7-12v since the 5v will be used ...
0
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3answers
120 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 ...
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0answers
63 views
Fusible Resistor Calculation [on hold]
How do we calculate the value of fusible resistor used in the input side of a capacitive power supply. The supply produces an output voltage of 5V DC. I want to add the fusible resistor (RT1) to ...
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2answers
94 views
Battery failing. Oscilloscope?
The question is - is there an inexpensive oscilloscope I can use to measure DC voltage and current to see why my battery pack is failing to power a DSLR?
In order to take long time lapse photos with ...
0
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1answer
19 views
Peak Period Forecasting in electric grid
I am currently working on the day ahead load forecasting using a regression model over a microgrid level.
I wanted to know is there a way I can detect peak period i.e period where demand is high from ...
0
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1answer
57 views
different types of smps [on hold]
I need a 12v 5A power supply for a heating element. I found out there are two main types of smps: first one is mounted in a metallic case and usually cooled by fan (in some websites it is called "...
0
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1answer
51 views
Addition of limit switch for power supply stops circuit from working. Circuit works fine without the switch?
I am having an issue with a limit switch to turn on and off a circuit. I am using a L7805 5V regulator with a regular 9V battery as the power supply for my circuit. When I plug in the 9V battery ...
0
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1answer
65 views
Powering a radiator fan with 12V DC power supply
I want to run an old VW Fox's radiator fan on a 12V DC power supply.
I have managed to burn out two of the PSUs so far. They work for a while but after a while they start overheating and die.
I am ...
1
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1answer
50 views
Is Power Factor only relevant at rated load in Light Equipment?
As you might know, LED lamps over 25W require a minimum 0.9 power factor in Europe.
I have designed a PSU for a specific LED lamp which is rated about 50W. There is a PFC-stage (crm) in order to ...
-1
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1answer
49 views
Linear power supply vs SMPS (losses in transformer)
We know that, in a power supply, there are always losses taking place.
If we have a linear power supply, the major source of loss is the core loss in the transformer.
But in an SMPS, where we have a ...
0
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0answers
34 views
Designing a Flex PCB as a wireless charging coil
I am designing an inductive charging circuit to power up a small device with an odd shape. None of the off-the-shelf coils fit the dimension specified. I figured I needed to design my own coils like ...
0
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0answers
46 views
Current Sensing circuit solution
I need a current sensing circuit solution for my application. I have a power board which has 5v line and 24v line. Each lines are going to two different loads. In load 1 which has 5v input i have an ...
0
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3answers
75 views
How to configure NPN transistor as switch and adjust current flow?
Consider the following circuit:
As signal a 100 kHz square wave (between 0 and 5 volts) generated by an Arduino.
I want to control the transistor so it will let the current from the supply pass ...
1
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1answer
45 views
Heating issues with solar charging circuit
I am using the above circuit to charge a 7.4V Li-ion Battery.With input MPPT voltage set at 12V, I have applied 13V input voltage to the circuit. The battery is charging at 1.4A. (according to the ...
0
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1answer
30 views
The way to efficiently operate some power devices with less loss, and appropriate heat sharing
I'm using a buck converter(OKR-T/10-W12-C made by Murata Power Solutions). The converter supports 4.5 ~ 14.0V input.
The input is 9.5V voltage from the another buck device.
And between of them, the ...
0
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3answers
61 views
Is ripple of LC filter constant?
How LC filter ripple becomes independent of load. Does it remain constant or it varies with the load? I know that capacitor filter has low ripple in low load, and with high load its ripple increases ...
0
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1answer
32 views
Replace potentiometer for Kemo M012 Power Control
The potentiometer of my (Kemo M012 Power Control) is mechanically broken and I would like to replace it.
However, I am unsure whether the replacement needs to meet any specific characteristics or if ...
