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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56 views

How to use a pressure sensor (transducer)? [closed]

I have this pair of pressure sensors that are addressable transducers. I want to use them for a project but I don´t really get how to get them to work. I´m used to the type of sensor that has 3 cables(...
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1answer
106 views

Switching Power Supply Chirping, How to Fix? [closed]

I have a Dedicated Micros UP07223010 power supply that gives out a chirping noise. A voltmeter attached to the terminals shows a swing for each chirp. A few days ago, my HP laptop power supply ...
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77 views

24v output from two 12v batteries in series, charge them with 12 volts in parallel

I have a solar charge controller which can charge 12volts batteries. I have two 12 volt batteries which are connected in parallel. I need to have 24volts output without using dc-dc step up converters. ...
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44 views

Draw 15V from USB C Power Delivery devices

I need to draw 15V from USB C PD capable devices such as power banks or chargers. So I need a rather small tool or build for this I can draw about 15V 3A via usb c with. Thanks for your help.
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69 views

Solar power to USB C PD

I want to convert direct sunlight energy into usb c pd. USB C Pd then will be used to charge a powerbank. The bank can be charged via USB C. The actual solar panel is this: https://www.amazon.de/...
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46 views

Questions regarding Gallium Nitride semiconductor devices in Switched Mode Power Supplies

I have a couple of questions regarding the use of Gallium Nitride MOSFET devices in a DC/DC converter design of mine. My topology is an LCC full bridge converter. My knowledge is not at expert level ...
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2answers
49 views

Proper voltages from same source

I'm building a small electromobile. I was planning on using a car alternator as the motor, however I'm now looking into buying a 48V 500W BLDC motor. The problem is I'm not really sure how to manage ...
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48 views

How to decouple the grounds for two different switching regulators?

I've a single DC 24V battery supply, which I use as the input for generating separate 12V and 5V supplies. Two separate LM2576T ICs are used to regulate the voltage to the lower levels. However, the ...
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57 views

How to remove DC power supply noise while load is active?

I'm using a breadboard power supply to power up two STM32F103, two Hall flow sensors, one IC555, and one 16x2 LCD with backlight. While everything is connected I have alot of noise in the system which ...
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1answer
226 views

Designing an effective power supply for embedded products

I'm currently designing several embedded microcontroller products to be powered from a wall outlet. I plan to use wall-wart power supplies to give an input of approximately 5-9V DC but I want the ...
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35 views

Neon Power Supply Voltage AC Measurement

So I was provided with a circuit which consists of a variable transformer connected to the main (essentially allows the input of the power supply to be controlled) and a Neon Power Supply (Has An ...
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1answer
52 views

Isolated UART communication: Which side should send the supply for the isolator?

I am in a situation to establish an isolated UART communication between two separate PCBs. The first PCB regulates and sends the required isolated power of the second one. The UART communication will ...
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119 views

Does a PC need pure sine wave? Need to test using 1000W, 120VAC 60HZ input, 240VAC 50HZ output

I need an OTS (Off The Shelf) solution to test PCs before they ship to Europe and beyond. I need to provide up to 1000W of 240vDC 50Hz power from a 120vAC 60Hz outlet, because I want to make sure the (...
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1answer
65 views

USB Type-C wires

I have a USB type-C rapid charger 5V/3A, want to use that for one of my projects but there's 8 wires and i can't tell which is which to get 5V out of it! sorry for the blurry image, couldn't get the ...
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1answer
64 views

Time taken by power supply to reach output voltage

My question is regarding programmable power supplies. If I send a SCPI command to the power supply using USB/RS-232 or some other serial communication, how do i know the time taken by the power supply ...
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49 views

Reverse engineering LCD signals on HP power supply

I have recently acquired an HP 6632A power supply and was inspired by Roberto Barrios' project of replacing the screen with an OLED display to do the same. However, it is evident that the 6632A is ...
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50 views

Can MIC4102 be used to drive Boost Converter

I'm trying to design a high-power Buck-Boost converter, which is meant to convert a 45-63V input voltage into a "constant" 48V. The application requires quite high currents (up to 20A continuous). The ...
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1answer
67 views

1500-6000V linear regulator (noise eater)

Is there any known approaches to regulate HV in the range of 1500-6000V in order to eat noise? Low-side regulation is a possibility. The idea is to get ~100V higher voltage than needed, and then ...
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0answers
92 views

Can I use diodes to protect power supply outputs?

(Note, this is my first question on this site, please point out if there is something that I am doing wrong here.) I have a thyratron that requires two separate power lines to attach to it. The two ...
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1answer
36 views

Powering a usb hub using a different source

I dont really know much about electronics and I tried to seach online if this specific thing im thinking of doing has ever been posted and i cant find anything exactly the same. So what im trying to ...
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1answer
41 views

How to check (6 pin) PCI-E power rail on a pc powersupply?

Could anyone tell me if and how i might verify whether or not a PCI-Express 6 pin power lead on a PC is outputting correct voltage(s) ? A while back, I decided to try to refurbish a graphics card ...
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1answer
44 views

Does USB-A connector have the pins required for USB power delivery (PD)?

I have looked at various USB power delivery (PD) adapters that supply a certain number of watts and are powered by 230V mains voltage. Always, they seem to have either a USB-C port or a full USB-C ...
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1answer
61 views

Does USB power delivery support arbitrary voltages?

I'm looking for a USB power delivery power adapter to charge my Canon EOS RP camera via its USB-C port. Canon sells its own adapter for insane prices, and the Canon adapter is apparently nothing but a ...
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29 views

Travel Photography 3.5V 3,6-4,8A LED Lamp powered by power bank

I travel a lot for my work as a photographer. For this I'm building a custom full spectrum lamp. I have no issue running my build with a normal adjustable power supply from my studio. To be able to ...
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1answer
64 views

Rectifying reversible polarity battery with minimal power loss

I'd like to build a battery-powered DC power supply that will accept a single-cell battery in either polarity (i.e. it doesn't matter which way you put the battery in). I'm thinking of using the ...
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29 views

Pulsed Power Charging Resistor and Choke

I am currently attempting to build a pulsed power supply that requires an 8 H inductor to produce 50 kV 17 A square pulses with widths of 100 uS. Please see the attached schematic for more details (...
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2answers
43 views

Series or parallel fan connection

So I wish to wire a project that uses three 12 V fans but I don't know if I should get a power supply with 12 V or 36 V.
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1answer
40 views

Voltage regulators in series

I'm trying to figure out if my power distribution setup is hurting my circuitry. Below is a picture of the setup for one device: The power supply is a wall adapter rated for 6VDC/900mA output. The ...
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1answer
43 views

Which wire should I use as dummy load for this specific PSU

I'd like to make lab power supply out of my old ATX Power supply. I am beginner in electrical engineering and this project seems pretty straightforward. I've checked many tutorials about it and ...
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2answers
81 views

Whats the purpose of 0R in Sonoff POW [duplicate]

I'm designing my own Sonoff with ESP32, with power monitoring capability. Now before I start my own design, I took a look at Sonoff design. In the Sonoff POW the power metering IC has a 0R resistor, ...
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3answers
85 views

Voltage loss on DC circuits

I want to connect 4 bulbs in parallel. The bulbs need 12V DC and rated 18 watts. P=V*I, that means I=1.5 A on each bulb. From that the resistance of the bulbs are 8 Ohm (R=12/1.5). The circuit will ...
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4answers
87 views

Power supply for multiple parallel LED strings?

My sister is building a display sign, and wants to have several "marquee letters" lit up on it. Like this one: She bought 9 letters like this, and they all run off two AA batteries, and internally ...
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41 views

High amp multiphase buck

I am looking at designing a multiphase buck that needs to operate from a truck battery (24V) and has a constant output of upto 100amps at 24volts. We need to be able to set the exact amp draw with in ...
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0answers
51 views

How do portable batteries with AC outlets handle the ground pin/wire?

There are many portable batteries ("power stations") that have AC outlet(s) with – what looks like – a dummy ground pin. From what I can find in their manuals, it doesn't seem like these devices are ...
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43 views

Switching between 5V Power supplies with minimal losses [duplicate]

I'm designing a circuit that allows one to switch between two different 5V sources, which is then fed into a 3.3V regulator IC. I'm targeting low cost and low board size, and I'll take a solution ...
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1answer
78 views

DC Power Connector Type [on hold]

I have looked at many DC connector types but still couldn't find what type is the following connector. It's not XLR or Power DIN. Any ideas? It's similar to GX16-4 4-Pin 16mm Aviation Pug but it's not ...
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5answers
181 views

Resistor & capacitor are getting too hot

I made a transformarless power supply with capacitor. When i connect it on ac, it light the leds. But after some second the 100ohm resistor and 470uf capacitor get too hot. Its too hot that i could ...
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32 views

Driving a WS2815 12V LED strip with a CC+CV driver

I am selecting a driver/PSU to power a string of WS2815 12V LEDs. WS2815 datasheet here: http://www.world-semi.com/DownLoadFile/138 One option I am looking at to power these strips is the Mean ...
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1answer
93 views

What is the intended use of the 400 Hz-rated power supply on osciloscopes?

The power supply of many oscilloscopes and other test equipment from different manufactures are commonly rated for 400 Hz operation. For example, Tektronics MDO3000 is rated to work at 400 Hz at 115 ...
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1answer
65 views

TVS diodes in series

In the picture below, there are three TVS diodes in series (D13, D14, D15). They are placed from drain to -13V reference, which is the reference for the rectifier. The diodes are 1.5KE300A, they have ...
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0answers
33 views

Power supply charging backup power - current flow via mosfet

I have following diagram on falstad Top +5V is main PSU (12V 10A). Bottom +5V is battery (12V 2.3Ah). I have load about 2-3A so I dont think diode is good solution. Well I am trying to achieve ...
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3answers
81 views

Negative current displayed on the power supply

I have a problem regarding the power supply and my circuit. As the picture shown, my power supply is connected to a voltage regulator, Low Dropout Voltage regulator (LDO) to be precise. The part ...
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1answer
75 views

How to use USB-C cable with a charger

Ill try to be as brief as possible. TL;DR: How to use my 3A 5V USB-C charger to power a dumb device that needs 5V 3A to run. My goal: I want to have a nightstand, that can charge 3 devices at the ...
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1answer
62 views

How to power a 10-watt electric circuit without grid connection in cold countries? [closed]

What options do we have for powering electric circuits without access to electric grid? For instance, to power a 10 watt LED lighting at night? The motivation to the project is to add some lighting in ...
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1answer
29 views

Is it possible to use Ultrasonic sensor HC-SR04 in continuous power-on mode

I will be using Ultrasonic sensor HC-SR04 in water level measurement. I will be triggering the US sensor and getting back the time-pulse from it at very slow rate maybe once every minute. I want to ...
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1answer
44 views

Connecting negative terminal of DC power supply to negative terminal of other DC supply

I'm wiring up an electrical box that has several sensors, relays and a PLC. The PLC and relays are powered with a 24Vdc power supply. The sensors, which provide an analog input to the PLC, are powered ...
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2answers
91 views

ATX Power Supply Minimum Load

I know this is a commonly asked question but most of the answers I got are more than 5 years ago. So basically, My friend found a ATX power supply and was gonna give it to me. Since I already have a ...
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1answer
32 views

Isolated power supply with output on a 2kVDC floating ground

I am building a system of detectors which are referenced to independent floating grounds. The maximum voltage between each stage is 2kVDC. So I need isolated supplies which can operate continuously at ...
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1answer
61 views

Designing a 6V --> 40V step up converter [closed]

I need to design a step up converter with the following requierements: Vin = 6V - 8.4V Vout = 35 - 40V, Iout = 2.5A Could anyone give me some insights on how to ...
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3answers
103 views

What power adapter do I need to charge a 7.2V 4000mAh battery that I made? [closed]

I made a Ni-CD 7.2V 4000mAh battery. What power adapter do I need to charge it? How many volts and how many amperes should the adapter output? Each battery cell is 1.2 volts. I have a 9V 500mA ...