We’re rewarding the question askers & reputations are being recalculated! Read more.

Questions tagged [power-supply]

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

660 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
0
votes
0answers
42 views

Controlling 2 PSUs with an mCU

I'm finalizing my plans to make a physical control panel to interface 2 of my 3D Printers to an embedded Linux device. (Just minimal physical controls since 95% of the controlling will be done via a ...
0
votes
0answers
91 views

Bidirectional Monophasic 2 Motors Driver with ULN2803A and Relays

I am a hobbyist who is trying to build a DIY like car robot controlled via 2.4GHz radio and decided to use ULN2803A which was unused on my electronics equipment and has 8 outputs 4 for each motor and ...
0
votes
2answers
70 views

Designing high current test set up

I need some help designing a high current test. I know just the basic concepts of circuits so any help would be appreciated. I currently have a programmable DC power supply that can supply up to 220 ...
0
votes
0answers
293 views

How to get a stable 5V Supply to get stable readings from ADC on Raspberry Pi using SPI

I have been working on a way to get very accurate measurements of the tilt of a surface. The signal I use is a bipolar one that ranges between +/-2V. I started by trying the MCP3008, but the since ...
0
votes
2answers
377 views

Chassis grounding for multiple daisy-chained units

I'm designing a system that provides power/ethernet/serial for up to 5 daisychained units. All of the boxes will be metal and my initial plan is to run power and signal ground through the 14 pin ...
0
votes
0answers
411 views

LTC3780 voltage/current limit indicator

I recently bought an LTC3780 circuit from China to build a variable power supply. I would also like to have voltage/current limit LED indicator there but every tutorial I found on the internet ...
0
votes
0answers
448 views

DIY power supply 4 amps and 5 Volts

How can I make a power supply that is able to give 4 amps in terms of current and 5 Volts fixed? I've made a power supply before with variable voltage however the amp output never went above 1A. Which ...
0
votes
0answers
60 views

Using somesort of a switch between 230V AC and 24V DC

This is a vary basic question which will probably be answered in a blink of an eye by some of you. I have a few hardware devices which have the same wiring schemes. The only difference is some of ...
0
votes
0answers
118 views

Op-Amp Dual Supply Generation

I am planning to generate +/-9V using LT1026 as shown. These configuration is shown in datasheet of LT1026 Charge pump (page 5). But my question is if I add one more IC in parallel if I need ...
0
votes
1answer
116 views

How to verify if power supply is enough to handle power consumption spike?

I am looking to find out how to analyze what will happen to a power supply if my load suddenly draws more current. On my current example ( but that also happen to me with different components ) For ...
0
votes
1answer
48 views

multiple peripherals though a single USB type C

I'm trying to build a TV set-up box composed of several peripherals such as: computer(raspberry compute module), wireless audio transmitter and a DSP each with various power requirements. I would ...
0
votes
1answer
46 views

Given specific equipment wattage, and the capacity of an industrial grade portable battery, how can I determine theoretical run time?

I am located in North America and all equipment is standard 110-120v. The 4 appliances are: 2 Pioneer CDJ-800s. According to Pioneer's website, they operate at 21w (I assume this is PEAK ...
0
votes
0answers
276 views

Frequency of operation of typical laptop's 5V switching regulator powering USB ports

What lowest frequency should I expect from a modern laptop? I need to calculate a filter for powering some analog circuitry from USB.
0
votes
0answers
226 views

3kW power supply from 230Vac input

What kind of power supply topology(s) should you use for a CC and CV programmable power supply with the following parameters? input: 230Vac output: 0 - 1000Vdc / 3A max.
0
votes
0answers
966 views

Max Current Limiter for Power Supply

This is probably an easy question for many of you. I am newbie, so just asking this question. I am creating a workbench power supply for my projects. I have not created the circuit myself. Instead ...
0
votes
2answers
807 views

Making A USB Charge Cable (to replace 2.4V power supply) - Buck Converter?

I have battery-powered hair clippers that charge with a 2.4V 2000mA AC adapter. I'm looking for the best possible way to lighten or eliminate the adapter, as the one that was included is huge and ...
0
votes
0answers
79 views

High speed control loop with high resolution ADC

I'm designing a digital lab power supply for the sake of learning and also because I need one lol. I'm planning to use a simple 50Hz transformer with a Buck converter (I know this brings switching ...
0
votes
0answers
379 views

How to know if a LED power supply will deal correctly with dimming

I have a led strip with its 24V own power supply (IKEA's Ledberg), and I want to make them dimmable. I've successfully done it with an arduino and a MOSFET, but I'm unsure if the power supply will ...
0
votes
2answers
628 views

Backup power source from usb battery

I am trying to use usb battery bank as a backup power source for my diy project. Project is using arduino to control transistors and to turn few devices (like pumps and lights) on and off. Power ...
0
votes
0answers
1k views

How to recover from a brown out on STM32L0

I'm using STM32L0. My firmware operates at 2V. These are stepped down from 24V. If I have a short of the 24V for a short period of time this causes a brown out on my 2V the voltage begins to oscillate ...
0
votes
0answers
405 views

Bridge Rectifier Average Value Modeling

I had previously posted a question regarding modeling the transfer function of a diode rectifier but it sounds like this not possible. So I have done some reading on "Average Value Modeling" and it ...
0
votes
1answer
71 views

PCB power connector identification

Can anyone identify the series of connector used for the AC input of this TDK MSA818 PSU from the late '80s? The pin spacing is ~7.3mm (3.65mm if you count the missing pins) which doesn't match any ...
0
votes
1answer
66 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 ...
0
votes
2answers
502 views

AC (230V, 50Hz) line detection using H11aa1

I am new to Power Electronics, I am working on to AC line detection using H11AA1 IC. Schematic is as shown here. With the following calculation, I figured out the resistor value R1=8K ...
0
votes
1answer
68 views

5 Volt power supply using lipo batteries in parallel( using Booster)

In the circuit above, i was able to read a current of 1.7 Amps using a multimeter at the o/p of the converter. But once i connect a raspberry pi at the output, the raspberry pi does not seem to run ...
0
votes
1answer
71 views

How to achieve digitally adjustable supply rail sover a wide range (low up to 300V)?

I need to be able to vary the supply rail over a wide range (low voltage up to 300V DC). Current consumption will be from 1 mA up to 40mA. The thing will be powered by AC mains 120V. I am wondering ...
0
votes
1answer
363 views

Multi-voltage power supply

Is there any way to check if a power supply is auto switching multi-voltage input (120-230VAC) with an output of 6VDC? The supply is an electronic power supply (not transformer based) but has ...
0
votes
1answer
432 views

Measuring loop Gain and phase of of a flyback converter

I have a flyback converter based of the LT3798. The converter takes a rectified AC (120Vac,60Hz) and steps it down to 24Vdc. It uses a third winding on the transformer to power the IC and to generate ...
0
votes
1answer
427 views

Power Supply for LED Project

I am working on a project where I have to power a 5 meter long LED strip (https://www.sparkfun.com/products/12022) and 54 3.4V 20mA LEDs and control them all from an Arduino. My current idea was to ...
0
votes
1answer
1k views

Connecting two SMPS in series

I have an SMPS which takes input of 220-240V, 50Hz single phase AC supply and gives an output of constant 12V DC.Its current rating is 20A. I needed constant 24V for a PMDC motor which works on about ...
0
votes
3answers
974 views

Why 2 pole AC power switch?

What is the purpose of switching both load and neutral lines of AC power as opposed to just switching the load wire?
0
votes
3answers
170 views

How to make a simple negative power supply

I want to experiment with amplifiers but I need a negative power voltage source. I looked for some circuits but as far as I found they either are not simple & reliable or require an IC. Is ...
-1
votes
1answer
46 views

Collector-Base Voltage > Collector-Emitter Voltage > Emitter-Base Voltage for a BC Transistor

I'm a high school student, I've been recently introduced to transistors (CE, NPN Type) using Semiconductor PN Junction and a lot of complicated things which I don't understand properly. The ...
-1
votes
1answer
156 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 ...
-1
votes
0answers
143 views

Raspberry Pi UPS from powerbank

I have a Raspberry Pi that is fed by a powerbank which in turn is fed by a USB wall adapter, and I want to interrupt the power from the powerbank when there is current coming from the AC wall adapter, ...
-1
votes
1answer
43 views

Power Management

I am supplying power to a Arduino Uno that draws 45mA of current and a sensor that draws 20mA with a 9 Volt battery(ampere for battery is 550 mAh. How much power is the whole system consuming? I am ...
-1
votes
1answer
418 views

Why doesn't Arduino Nano provide enough current to ESP8266?

I have an ESP8266-01 WiFi Module and I have some troubles in supplying power to it. I use an Arduino Nano powered by a 9V battery (actually 6x 1,5V AA) through the Vin pin and the GND pin. I power the ...
-1
votes
1answer
883 views

Power bank charging using a solar panel

I'm trying to charge a power bank of 5V, 5000mAh, using a solar panel 6V, 14W. I have made the connection from the solar panel to a DC-DC convertor (specification: 3-37V, 3A) which steps down to a ...
-1
votes
2answers
990 views

Ws2812B strip required AWG

I’m looking to setup 6 runs of WS2812B strips at 10 meters length each (2 rolls of 30/m each). I selected a 5v 100 amp psu and plan to power each strip by supplying power at one end and in the middle....
-1
votes
2answers
98 views

Is grounding of the LRS-100-24 power supply 100% needed?

I'm trying to build a speaker for home but don't have basically any experience with electronics (i can do some basic soldering). I went to a local electronics shop and asked the seller what product ...
-1
votes
1answer
43 views

Protection on Dell notebook power supply

[Beware: i'm a electronics-starter] Hello, i built a variable power supply using a DPS5005 and a Sainsmart boost converter to get 42V. I'm using an old dell notebook PSU (DF266 Output: 19.5V 4.62A) ...
-1
votes
2answers
93 views

The capacitance value that makes the voltage in phase with current

What's the value of the capacitor that makes the voltage in phase with current , and then what's the circuit current and power?
-1
votes
1answer
122 views

Power supply for multiple solenoids

I'm currently looking to power 10 solenoids: rated (nominal) at 24VDC, 400mA, 10mm stroke, 25N. (JF-1040 no datasheet unfortunately) I will be powering with a voltage higher, (giving me a range to ...
-1
votes
1answer
72 views

how decreasing ground fault resistance decrease the touched voltage?

Fault current = supply voltage / fault path R. Assume live conductor of 230v touches the equipment metal frame. 1) assume R path through grounding electrode 25 ohm I= 230/25=9.2A 2) R=3 ohm I=76....
-1
votes
1answer
117 views

feedback loop for a single stage offline flyback that is powering 2 independent LED strings

I have a design that is a offline, single stage flyback, powering two different LED strings. The output of this converter is about 50W and the output voltage can range from 20V-45V. I'm using ST ...
-1
votes
1answer
255 views

will this voltage tripler circuit work?

I need power supply for my opamp as i only have 5 volt supply. I need at least 14 volt power supply so that i can power my opamp. I recently got this circuit of voltage tripler using 555 IC. Will it ...
-1
votes
1answer
92 views

How to replace an AC/AC power that has 2 outputs

Hi the power adapter for my mixer broke, and I need a new one (Alesis MultiMix 16 USB 2.0). However they don't make them anymore, so I'm looking for an alternate solution. It has two 18V outputs that ...
-1
votes
2answers
2k views

UC3843 buck converter

I want to build an adjustable buck converter with uc3843 ic. I built up a circuit in LTSpice for simulating. The problem is that, i want to adjust the output from 3v to near input voltage. With the ...
-1
votes
3answers
72 views

how can I control a metal temperature at 140-160 degrees?

I need to keep a metal plate temperature at 140-160 degrees, what kind of sensor should I use?
-1
votes
2answers
112 views

What amp rating of 24vac transformer for LM317T

I am trying to post a new question about the lm317 to-220. I just want to know what size transformer for lm317 at full 30vdc. I know its a 24vac center tapped transformer but is it 1 amp or 5 amp ...