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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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Understanding this Mean Well Power Supply

I purchased, I believe, the wrong power supply for my purposes, but I'd like to understand a few aspects of its specs: https://www.meanwell.com/webapp/product/search.aspx?prod=ELG-200&mws=...
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2answers
122 views

Can I hook up more than one device per terminal on a power supply?

First post! My question is straightforward, and NOT a duplicate post. This is meat & potatoes here, less on theory, more on practical application. I know you are all more knowledgeable than I am. ...
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1answer
117 views

Advice for this P-Channel MOSFET Power Source Selector

I know there are already questions and answers about P-Channel MOSFETs and power source selection, but I still find myself pretty confused, as many of those are more complex than my circuit or simply ...
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0answers
37 views

Voltage drop on power bench supply for channel being off

If I measure voltage drop between terminals of my bench power supply (spec) I get -15 mV when channel output is turned off. Why it is not reading 0? I believe it's due to internal impedance of the ...
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2answers
84 views

What are the practical differences between AC and DC transmission?

I have a long (2m) but thick wire between transformer-based power supply and low frequency power amplifier. Know your best advice ahead, but no, I cant get rid of it. I can put it in two ...
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1answer
50 views

Single Package Transformer [closed]

I have very limited space in my project (0.75" x 1.5" x 1.25") to add a remote led light. Looking for a single unit self contained with the following parameters, so I can simply connect the input of ...
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2answers
86 views

Ferrite bead in Ground path of Input Power Supply

I have been following the schematics of Colibri Toradex Carrer Board. I have used most of the components from their design. However, they have used ferrite beads in Positive terminal and Ground ...
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2answers
46 views

connecting pam8403 and bluethooth module in series

I am new to this so I apologize in advance for any rookie mistakes. I decided to make a portable Bluetooth speaker. I have a pam8403 and a Bluetooth module: Both of them require 5 V input. Can I ...
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29 views

Making sure power is supplied from a DPS5020 fast enough for an induction board to oscillate

Apologies in advance - I'm a software guy who likes to dabble here and there and my latest project is a little beyond the comfort zone. I'm building an induction heater (with off-the-shelf parts for ...
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3answers
74 views

Interpreting rating label of DC power supply - supposed to be a constant voltage source or a constant current source?

Link to product store page Hi all, bit of a beginner question here. According to the output section of the label, this is a 12V, 1000mA power supply. This is confusing me a bit. Is this device meant ...
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4answers
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Too low efficiency with “0-30V 2mA-3A DC Regulated Power Supply unit with Continuously Adjustable Current Limiting Protection” PSU kit [closed]

I ordered and assembled the kit (link and image added below). Everything works fine. But as everybody knows, it requires a great heat sink for the regulator. The ordered unit costs less than $5, but ...
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45 views

Boost converter output voltage error

I'm using LT3494a to generate 37v from 6v input. This is my circuit. According to the datasheet, this chip can provide up to 40v output, so it should be able to generate 37v. Also, the simulation ...
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2answers
68 views

I want to make an auto power cut off for my battery charger

I have a charger for a 12v battery but it is without auto power cut off. I know I need a circuit consisting of a comparator and a relay and I drew the circuit but I don't know if there is something ...
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2answers
41 views

Isolating A Noisy Component In A Circuit

I've been working on a project the past couple months or so and I am incorporating an lcd touch screen as an interface for it. The device is a small digital synthesizer. The problem I am having is ...
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0answers
48 views

Routing the main power supply across a PCB and choosing vias for it

I have a board that uses several different switching converters with 33uH ferrite beads that take up a fair amount of space. I'd originally intended to keep them all at the top of the board (not top ...
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0answers
45 views

DIY ATX PSU turns off when attaching load on 12V rail

I want to convert my old ATX power supply to a simple bench supply for 12V devices. On the label it says it's a 300W PSU where I can use 264W on the 12V rail (see image below). https://imgur.com/...
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2answers
70 views

Is my radio pulling more current than it should? [closed]

I have an FT-747GX radio that I am using as a RF generator for a plasma cleaning machine. In the operating manual on page 3 it states: I have a power supply connected to this radio which outputs ...
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0answers
61 views

High voltage low current PSU, newbie question

I need two different power supplies, one 600vdc with a limited current of 500uA (micro ampere), the second 300vdc - 500uA. For laboratory work that requires high voltage and low current. I do not ...
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2answers
190 views

Why do engineers usually short ground and negative ports on a DC power supply?

I'm fairly new to electrical engineering, and have seen many DC power supplies where someone has shorted the ground (green) port with the negative (black) port. From my understanding, the ground is ...
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1answer
57 views

Measuring USB power adapter quality using multimeter

I have heard horror stories about poor quality USB power adapter. I have a collection of no less than 20 USB power adapters, most are from cell phone manufacturers and some from small projects. I ...
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0answers
48 views

Parallel resonant induction heater

I implemented a parallel LC induction heater using theory. I made a simple square wave Inverter providing a frequency of 20kHz to the tuned LC circuit. The problem I'm facing is that my tank is not ...
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2answers
41 views

Difference between input current and supply current?

I am reading and trying to understand datasheet of ICs. I am reading this datasheet now : http://www.ti.com/lit/ds/symlink/sn74hc00.pdf In the table 6.5, there are two parameters namely Ii and Icc. ...
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0answers
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Heathkit IP-27 bench PSU min. stays at 0.18V and there is a +0.1V for all the readings?

I've recently acquired a Heathkit IP-27 bench power supply. The supply itself works quite fine except that the minimum voltage it can be turned down to with the coarse adjustment is only 0.18V, doesn'...
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0answers
72 views

Power switch - IN and OUT connected all the time

A while ago, I asked about detecting whether a power jack is connected or not, in order to select power source from USB or DC jack. You can see the question here: Power selection circuit for USB or ...
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1answer
104 views

raspberry pi power [closed]

I have a VEX 393 motor and was wondering if there was any way that I could hook it up to a raspberry pi and if so how many extra voltage is needed to add to the ground prong (provide diagram if ...
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1answer
79 views

Cuk converter implementation

I have come across this article: https://www.powerelectronics.com/power-management/step-down-dc-dc-converter-eliminates-ferrite-cores-50khz-enabling-power-supply-chip That describes the Cuk DC/DC ...
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1answer
50 views

Designing a step-up transformer [closed]

I'm designing a new transformer for a project I'm building. I trying to design a new product the primary produces has 2 connections and makes 0.8A. I want to step-up to one coil and need to produce ...
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1answer
37 views

Dual supply PCB layer stackup

My PCB is powered from USB port and includes Recom RKZ0505D for powering dual-supply OPAMPs. Recom gives +5V and -5V outputs. So I have: Top signal & components Bottom signal & components GND ...
4
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1answer
1k views

What are these obscure components?

I'm having difficulty identifying these components. I salvaged them from a diy power supply enclosure from a garage sale. Each of the black leads in the image attached to female connectors on the face ...
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3answers
52 views

Power determination for resistive load

I am a mechanical engineering student and i need to measure electrical output. I have some voltage and current measuring instruments. I used them to measure the voltage & current of a blower(...
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2answers
65 views

How does USB port on a power strip detect the optimal current output?

I am looking to buy a power strip with USB ports and came across this one online. The description says "Top-notch USB smart charging technology which can detect and deliver optimal current output up ...
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3answers
2k views

Why would you need an op amp for reference voltage when the voltage divider does the trick?

Is there a reason this schematic uses an op amp (AD8031) for the reference voltage of the op amp (AD8544) filter when the voltage divider already brings down the voltage anyways? Can the AD8031 op amp ...
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0answers
57 views

Negative voltage supply

I've been trying to make a active load that would use a very small resistor, around 10mOhm as a shunt resistor. I've figured out how to make it, it's a common circuit, however since I need to use ...
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2answers
117 views

Can I use any HV Probe for a Voltmeter/Ampmeter gauge?

I purchased the multimeter pictured below for a high voltage power supply I'm working on. It's rated for 100V DC and 10A, but I hope to measure several thousand volts. Is it possible to use a HV ...
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1answer
84 views

RGBW Cree XM-L LED power circuit HELP!

I have 10 Cree XM-L RGBW LEDS and I would like to power them from a 12V power supply. I came up with this idea: A 12V 30 amp power supply powers 3 different step down buck converters (10 amps each ...
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0answers
51 views

AC voltage at the output of SMPS

We have 230 VAC power supply in our lab.A chemical earthing is done for this power supply. I have connected a SMPS (LRS-35-12) to it. The Output of SMPS is connected to a load of maximum 2A. I have ...
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1answer
44 views

Power supply and pcb connections to ground, earth

I am planning a pcb which is powered by two switching power supplies LRS-150F-5 (230 V/AC to 5 V/DC) LRS-150F-12 (230 V/AC to 12 V/DC) . The power supplies are mounted in their own metal box and the ...
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1answer
54 views

Identification of power connector

What kind of 4-pin power connector is this, displayed in this (exemplary) image? Are there any specs of the maximum current and voltage it is designed to provide? (Unfortunately this was the best ...
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2answers
79 views

230vac / 5vdc power supply design

I am making my own basic bench power supply mainly for testing logic gate circuits, relays, flip flops etc, that I can move around to different locations. The circuit of the entire schematic will be ...
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0answers
23 views

MAX17205 battery pack fuel gauge configuration

I am working on the fuel gauge by MAX17205 for my project. https://www.maximintegrated.com/en/products/power/battery-management/MAX17205.html I am able to communicate with the chip using I2C protocol ...
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2answers
81 views

How to diagnose transformer failure or expected output

I have a pcb that takes 5v from a main board on pins 3&6 and takes this current through the T1 Transformer (obsolete, no datasheet S1673305) and should output some voltage (service manual does not ...
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0answers
40 views

SMPS Flyback transformer selection

I am trying to design a SMPS for a project (I have to make a custom one for integration purpose). This SMPS have universal input (85-265V AC at 50 or 60 Hz) and an output of ideally 53V (but it can ...
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0answers
31 views

TPS562208DDCT current problem

I have attached a PSU design which I have created. The input voltage is between 12 and 24V DC. The first stage creates an isolated output voltage of 7V that is then fed into the two TPS562208DDCT (...
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1answer
35 views

Power supply design with charging circuit

I am designing a GSM modem power supply circuit. The circuit requires a 2A power supply. The module SIM800C itself can be powered directly by Li-Ion or Li-Poly battery power. I am looking at a ...
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0answers
27 views

Can I connect 2 power supplies for 16 meters LED RGB strip?

I've bought 2 sets of 10 meter LED RGB strip (7.2w/m) for a room. Then I've cut them to around 8 meters each to get 16 meters. Everything seemed fine but one thing, because it's 2 separate controllers,...
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1answer
73 views

Arduino 2 power source - auto switch?

I'm planning to switch between two power sources DC and USB with an Arduino like below diagram. What I'm going to do is cut off the DC V+ wire when I insert the USB jack to the Arduino for uploading ...
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1answer
49 views

Wiring a power supply, arduino, and LED strip together?

I've been researching various websites on all of my questions and have found answers to many of them but I am also finding conflicting answers for some of them. I've read that electricity is something ...
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1answer
106 views

Removing the smallest supply decoupling capacitors in multilayer boards

Hello I want to make PCB for ADF5901 24GHz power amplifier, it says use 3 capacitor for each supply pin, 10pF, 1nF and 100nF. we have about 6 supply pin. Can we remove 10pf bypass from all pins, If ...
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2answers
109 views

Why do we need a chain of resistors to increase the voltage? [closed]

I did a workshop on SMT today and we made this board attached. However, what I don’t understand completely is the logic: why do we need 3 resistors to increase the voltage (on the boost part)? What do ...
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1answer
32 views

Remove PC PSU From Cage [closed]

I am trying to fit a Mini-ITX PSU into a small custom computer case. However with the PSU metal cage it is about 1/8" too tall. I can make it fit if I remove the cage. It is safe to run a PSU without ...