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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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power supply by using stepdown transformer

i was trying to make 5V, 1Apower supply using stepdown transformer, some doides and capacitors and finally 7805 regulator. however when i tried to drive servo motor from it i was not getting stable ...
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1answer
53 views

How to diagram power-side and ground-side switches?

I'm an early-stage self-teaching hobbyist. Just as a practice exercise I'm diagramming simple circuits (without looking at the instructions) of DIY kits that I've bought on banggood.com (awesome ...
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47 views

ATX power supply won't turn on when connected to motherboard

I am troubleshooting a problem with a power supply for an HP EX490 Mediasmart server. The power supply no longer powers on when the power button is pressed on the back of the server. I have ...
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66 views

Op Amp-based CV LM317 power supply

As many others before, I'm aiming to build my own simple CC CV lab bench PSU based on the LM317 regulator. Now, I've defined most of the circuitry, but I'm stuck with a particular design choice ...
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32 views

Simplest and chepest way to provide 3.3V@150mA from power supply running at 6Vrms@120mW

I have a power supply that can provide 6Vrms (50kHz) and 130mW max (maybe a bit more). Unfortunately, for my project I need a peak of 150mA in 3.3Vdc (ESP8266) in regular basis during TX but most of ...
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2answers
65 views

Best way to power LED strip (180 LEDs)

I'm assembling this addressable RGBW LED strip setup that is 3m long and 60 LEDs/m. I have found no answer to my two questions on other sites or youtube. (This is the strip I'm using: https://www....
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4answers
2k views

Can I use USB data pins as a power source?

I'm trying to build a circuit as seen below, where a sequencer controls the flashing of some LED sections, and an SPDT switch controls power to either the left or the right section of LEDs. However, ...
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77 views

Neon sign transformer as power supply

Can I use a high voltage neon sign transformer to charge a HV capacitor?
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36 views

Bypassing 110v power-supply on LED light-strip?

I am wanting to use 2 16.4ft rolls of multicolor LED strips in my enclosed trailer for lighting. They come with 110v power supply that plugs into another coverter that the LED lights plug into. Is ...
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0answers
61 views

What are these programming terminals for a 2 kW power supply?

Does anyone recognize the programming terminals on the real panel of this power supply? I would like to get the 50 amps out. It is an ATE1 made by Redfern radio, it is an old army surplus. Going in ...
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2answers
48 views

Powering multiple WS2812B strips from different sources, are all grounds connected?

I'm looking to confirm if I need to connect the ground of 2 LED strips which have different power sources. Adafruit says The key is to have all of the ground pins among the strips connected in ...
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2answers
54 views

Powering a device, which power supply?

I've got a device with a 12V input requirement like this: But I've got no idea what the name of this input type is, and after searching for the correct supply (needs to be powered from a 240V mains ...
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1answer
39 views

DALI bus power supply requirements

As per standard DALI power supply should be 15 V at 250 mA. In the same time standard says that there can be up to 64 devices on the bus. So I can suppose that each DALI slave SHOULD cunsume 4 mA from ...
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2answers
348 views

Things to avoid when using voltage regulators?

My project has components that operate at 3 different voltages (9, 5 and 3.3). I would like to only deal with one power source. Is it alright to feed one 12 V power source to 3 voltage regulators? Is ...
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1answer
51 views

overvoltage protection of opamps

simulate this circuit – Schematic created using CircuitLab I see diodes arranged like D1 and D2 sometimes used to prevent nuisance tripping of a power supply's internal overvoltage protection ...
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2answers
127 views

Is it a good idea to ground a heat sink?

Have a nice piece of Motorola obtainium that I want to use to power a Raspberry Pi, and I also happen to have a left over ground wire (the case has a three-lead power connector). The case is 100% ...
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1answer
81 views

Why is there 130V between my laptop charger ground, and Raspberry Pi 5V Supply Ground?

I noticed that I was getting mild shocks while touching my plugged in laptop and touching a metal shielded USB device plugged into the USB port of my Raspberry Pi 3 at the same time. I used a multi ...
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3answers
60 views

Is the positive supply of Arduino USB port connected to 5V pin? [closed]

You can power the Arduino Uno/Nano using the following: Barrel Jack (for UNO only), it is connected to the input to voltage regulator. VIN pin, it is also connected to input of voltage regulator. 5V ...
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0answers
45 views

Making a power supply for a 5V USB

I am making a battery bank for portable LED projects. The battery bank has a 5V 12A (60W) DC to DC converter DDR-60L-5. I would like to add some extra (nice to have) USB Female plugs to this battery ...
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1answer
132 views

Why ship power distribution systems have no neutral?

What is the reason for this difference between the distribution systems of power companies and the systems implemented at ships?
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1answer
23 views

altium input/output pin error

I have a problem (stm32f407vgt6) with altium input output pin error. I will use 3.3 volt in my mcu that's why I added 5-3.3 voltage regulator in the circuit but I ve taken this error. Details VCC0 ...
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1answer
43 views

STM32F429ZI reference voltage

I want to use the full output resolution of DACs (12bit) in the range of 0-1 Volt (and not in the range 0-3.3 Volt). I see there is a pin VDD in this board (STM32F429ZI), please help me to understand ...
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1answer
39 views

Old MSX computer -5v power

I picked up an old Toshiba MSX computer with a duff power supply. I need: Ground, +12v, +5v and -5v. I've picked up a 12v power supply and I thought I could use a buck converter for the +5v, but I'm ...
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1answer
18 views

Li-Po Charging from automotive supply and powering load at 3.6v

This question is very similar to many other threads, but with some additional constraints. I require a 2.7v to 3.6v supply derived from an automotive supply (typically 7 to 33v) at maximum of 1 amp. ...
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1answer
40 views

Off-grid solar system

I'm doing a project on designing an off-grid PV system to power a constant load at 900W at 12V, 24/day. If I choose PV systems that are rated at 48 V or any other voltage will that mean that any ...
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1answer
31 views

TLE42744 outputs lower voltage than expected

I am an engineering student and have just finished designing a PCB containing an STM32F405 MCU, an LSM9DS1 Accelerometer/Gyroscope/Magnetometer and 7 connections for potentiometer reading. My power ...
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2answers
37 views

Input power requirements for “load regulation” tests on DC power supplies

My question is this: What is the convention, if any, for specifying a power supply's input voltage value when performing a load regulation test? Background A typical specification for DC power ...
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3answers
72 views

Over-voltage protection system for a 7 - 20 A Load with 4 - 5.5 V output from PSU

The power supply used on the product, is a DC-DC buck controller 24 V in (3 - 5.5 V out). I need some suggestions to help protect a load (LED Display) which draws roughly 5 - 15 A the power supply on ...
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1answer
53 views

Will cutting data line of USB port can supply the right amount of current it is attached to?

I want to use a USB cable and an AC to DC adapter as a supply to my electronics project. I plan to connect the USB cable to the USB port on the AC to DC adapter then I will cut the other end of the ...
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1answer
73 views

Power source project

I’m currently a computer engineering student from lorma colleges and we’re currently doing our design project. Our project is called an advance helmet. A helmet that is capable on creating a ...
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2answers
92 views

Can transformerless power supplies be UL/CSA certified and is there any specific standard they must meet?

I am trying to bias a linear optocoupler on the AC mains side of a circuit, in order to transfer analog information to the secondary side of the circuit. I have designed the following capacitive power ...
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0answers
57 views

Power supply wires melted. Is there a way to fix it

We were testing a peltier module and turning on and off the power supply when magic smoke formed and it stopped working. The smoke happened immediately after the supply was turned on again. We were ...
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1answer
50 views

PIR Sensor for bulb in room

This has been very long since I left electronics but recently I restarted taking interest in it as hobby. I bought some PIR sensors from Aliexpress and found it is very simple to implement if I have ...
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2answers
105 views

Am I safe working with a power supplier of 12 DC connected to the AC wall socket main line?

I'm working on an electronic home experimental project. But I have always been afraid of the issue of electricity since it can electrocute. My question is.. Am I safe working with a power supplier ...
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2answers
42 views

How to choose proper power supply for 8 servos on Adafruit shield with Arduino Uno controller

I use Adruino Uno micro-controller powered with USB 5V from PC and Adafruit 16-Channel 12-bit PWM/Servo Shield on it with 1000uF capacitor, powered with 6V 2A power supply. Seems like it is not ...
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0answers
50 views

Cant recognise a Damaged component of switched-mode power supply

I was repairing an smps ATX power supply I found a damaged component that I could not it recognise. I thought it's a power switch since it was mounted to a heat sink along with tow D13007 NPN power ...
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1answer
63 views

Power Transformer question to power a motor load

So I bought a toroidal power transformer that can output 117Vac, 12.8A and has a power rating of 1.5kVA in order to power a motor that requires 115Vac, 13A. I wanted to see if this would be viable to ...
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1answer
76 views

how to switch off multiple power source (+5/+12/3.3) in the same pcb

I'm designing a PCB that receives 3 power inputs 3.3v, 5v and 12v. I need simple way to switch all of them of in one go. Here is a schematic of my PCB I looked into using a relay but all the types I ...
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1answer
54 views

Supply one device with two power supplies

i would like to ask if my schematics is ok. I have one (or more) device (here symbolic as "R") which are supplied by a main power supply. I would like to support them also with an usv for the ...
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1answer
79 views

Designing a buck converter circuit [closed]

How do I design the pwm circuit to produce the output voltage I desire? Full explanation: So I know enough general knowledge about electronic circuits to get by, but I'm building a NAS from an old ...
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2answers
73 views

Low idle power consumption for USB PSU

I'm trying to find out how "good" 5V power adapters can be with respect to power consumption if: there's no attached power consumer, and/or the consumer takes very little power, such as an ESP32 in ...
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0answers
52 views

Single supply AB class amplifier

I wished to know if there is a way to use an ab class amplifier without a double power supply or, alternatively a way to get dual voltage supply without a center tapped transformer
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1answer
33 views

Thermoelectric Cooler sensor

My team and I are testing our Peltier Thermo-Electric Cooler Module+Heatsink Assembly - 12V 5A from Adafruit. We are using an external power source and sensors to get readings for the current, voltage,...
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1answer
22 views

Isolated power supply for a cascaded multilevel converter

I would like to build a cascaded multilevel converter. Each module should be supplied by an isolated power supply around 100VDC. Using available bench power supplies is not practical, because they ...
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1answer
62 views

Cordless dremel hard wire [closed]

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 ...
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2answers
82 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
40 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 ...
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0answers
36 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 ...
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1answer
50 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 ...
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3answers
118 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 ...