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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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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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32 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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1answer
37 views

Monitoring Health of VFD [on hold]

Good day, Is there any method or external measuring tool that can be used to monitor the health status of a VFDs perdiodically?
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31 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
57 views

Is my radio pulling more current than it should?

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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56 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
160 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
52 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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31 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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1answer
25 views

Keypad controlled variable 18Vdc power supply [on hold]

I have design a mains operated 18 VDC variable power supply. However the on/ff and voltage setting is currently controlled by a switch and knob. I would like to fit a keypad with 3 "buttons" to ...
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2answers
36 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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41 views

Voltage reduction issue in circiut

I have two electrical network which I want to power using a single power source. I am using a 3 cell lithium polymer 8000 mAh 30 C for it. One of the network consume 40 A current and the other ...
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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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62 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
80 views

raspberry pi power

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
69 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
41 views

Controllable power source (current) with one transistor and one resistor

I have this circuit: It should be a controllable powers source for current. Is that right? 1) What's the name of this circuit? 2) What does the resistor and how can I calculate it? Thank you!
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1answer
48 views

Designing a step-up transformer [on hold]

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
31 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 ...
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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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1answer
56 views

How to modify a small power supply to not require a 20W load to turn ON? [on hold]

I have a couple of obscure german “AT60” power supplies I scavenged from some designer lamps. They’re small, and don’t get hot even under ~30W load — but for my purposes, I need them to be always on, ...
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3answers
41 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
61 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
1k 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
53 views

Protection and isolation of 4-20 mA receiver [closed]

What are the possible solutions to isolate a 4-20mA receiver circuit from an industrial point of view? What care can I take for the protection of that receiver? The sensors are basically environment ...
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0answers
41 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
110 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
71 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
43 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
35 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
50 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
75 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
17 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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0answers
51 views

Discrete DC Connector recommendations - 24v 8.3a [closed]

I need a DC connector for a DIY project I am working on, a high powered LED for an aquarium. I am using a 200 W 24 V power supply in conjuction with 5 Meanwell LDD-H Drivers. I’m hoping to keep all ...
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2answers
76 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
30 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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29 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
32 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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23 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
59 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
44 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
102 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
107 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
31 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 ...
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2answers
117 views

Multiple Step-Down Voltage Rails from a single DC Power Supply

I have one working PCB which has three different Voltage Rails: 3.3V, 4V and ...
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1answer
67 views

Flyback discontinuous mode, double voltage over the switch

Considering the following simplified flyback schematic. Which has the following voltage current graphs Why is there 2*Vin over the switch when the switch is turned off? And why is that change to Vin ...
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1answer
44 views

What fuse to select for a 240W power supply

I have a 12Volt 20Amp 240Watt regulated power supply to use for a table top pinball game - comprising of solenoids (2@ 12V 8A peak), some LEDs and a micro controller. The unit has an internal fuse but ...
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What factors should I consider when choosing a high amperage power supply?

I've searched around, but I haven't found an answer to this particular question yet. I'm building an elecromechanical project which requires somewhere around 60 Amps at 12 Volts. While this may not ...
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1answer
42 views

Is there a PCB coplanar edge connector made for high power transmission instead of data transmission? [closed]

Looking for a PCB-to-PCB coplanar edge connector that can carry ideally 40V and 30A.
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1answer
69 views

220/240 to 200v dc power supply

I have a 12kva (10kw) ups and I want to power it from a 24v battery bank. The dc input is 192dc input from the battery side. I was thinking off getting a 24 to 220 Inverter and rectifing it to output ...