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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3answers
34 views

Connecting two op amp circuits each of which use dual supplies, but where the two supply voltages differ

One of the op amps uses +- 12 volts and the other +- 5 volts. With only one circuit, I understand that the common ground for the entire circuit is midway between the two supply voltages, but when the ...
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1answer
39 views

What's the term for this type of battery? [closed]

A device I own has this battery: I need to replace it, because charging does not work anymore. Its dimensions are 20mm x 30mm x 4mm. Its being charged with +5V USB. What's the term for this type of ...
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2answers
38 views

LMR64010 wrong feedback voltage and wrong output voltage

The datasheet can be found here. The typical application circuit is shown: And my schematic: The difference is SHDN pin is directly linked to input, since I never want it to be off. The layout: The ...
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0answers
20 views

Battery power options for ESP-01 + Sensor (Arduino Project)

I am building out my first self-designed project and am a bit unsure how to proceed with the power setup. I'm making a sensor device that will send me a tweet whenever the relative moisture of my ...
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1answer
31 views

Appropriate power supply needed to power 15x 850nm IR LEDs

I have 15 IR LEDs that I would like to use as a floodlight for my exterior cameras. The thing is I have no idea how to calculate the total voltage and amperage needed. A single LED is rated for 1.7V-2....
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2answers
44 views

Stepper motor causes voltage drop when running

I am a bit new to the electronics hobby so I am trying to understand what is going on with my circuit. I am using a pic microcontroller to control a stepper motor, an LCD and an RTC using USB to ...
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1answer
78 views

Is HP 6623A Linear or Switching power supply?

I have an HP 6623A DC power supply and i wonder if its Linear or Switching power supply. I see in the manual it says linear, but i still wonder. Why i am asking: I am asking this, becouse after ...
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1answer
26 views

Two dimmers controlling LED strips and blinkig at certain levels

I have two LED strips powered via two dimmers, like so: Certain combinations of dimming on both dimmers lead to the LED strips blinking. The level of blinking is not deep, maybe 15-20% of brightness, ...
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0answers
12 views

Power regulating on device with 1 cell Li-ion and USB

I have designed a device which is powered by USB but has a built-in battery (1 cell Li-ion with charger) for short periods wihtout USB (a day). USB is anything near 5V and Li-ion is from 3 to 4.2V. I ...
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0answers
40 views

Power 100+ 5v LED matrices

I'm trying to power over 100 LED matrices laid out in a long, single chain similar to a stock ticker on news buildings. I do have the control part figured out but bringing power to the matrices is ...
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1answer
51 views

Smart load switch with inrush control and overvoltage lockout

After I finish making my dc-dc buck-bost converter, voltmeter and ammeter I decided to add a smart load switch to my power supply in order to have the posibility to connect electric motors, bulbs or ...
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Paralleling switch mode dc/dc converters for redundancy

I have a use case with 6 converters, 1 primary and 5 redundant. At the moment the system is configured to enable the next converter in an error daisy chain in case the supply voltage of the previous ...
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0answers
22 views

Power rating of dual output isolated DC/DC converter

I would like to use an isolated DC/DC converter SIP to generate 19 V from a 12 V input voltage for a gate drive application with approximately 1.2 W output power required. The isolation voltage should ...
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1answer
59 views

Buck converter ouptut zero voltage

I've designed PCB which uses TPS54531 to generate 5v from 12v input. The circuit as below is similar to the reference circuit from TI. After powered on, the VCC5_TMP read abnormal value 0 instead of ...
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1answer
35 views

Nixie tube and high frequency AC (drawbacks)

Recently I salvaged a piezo humidifier driver board which produces high frequncy AC volage. Naturally I decided to touch it's output. It hurt so I deduced there might be enough voltage to power a ...
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1answer
60 views

Obtaining both an Analog and Digital 5V Supply From Single 5V Supply

I'm replacing a stolen PCM4222EVM adc with a PCM4202EVM adc but they left my + -15V, 5V triple-output linear power supply. However, I just discovered that there is a difference in powering the ...
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2answers
79 views

Can I replace a power transformer inside a device with a DC jack and external power supply?

Let's say I have an electronic device, inside which is a power transformer that outputs a known DC voltage. Can I bypass the transformer and wire in a jack to accept the correct DC voltage from an ...
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1answer
36 views

Toshiba T1200XE PSU repair. Identifying some SMD component 222/22Y

Need help. I'm trying to recover an old Toshiba T1200XE laptop and it seems the onboard PSU has a problem. One SMD looks damaged and I think it's better to replace it. I'm pretty sure this happened ...
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1answer
51 views

Can't get WS2812B LED strip working with PC power supply

I am an absolute beginner in both electronics and LEDs. I would like to power my WS2812B LED strip (5m, 300 LEDs) with an old PC power supply. The power supply has 600W so more than enough power. To ...
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1answer
53 views

Determining capacitor value in a flyback converter

I have a dead audio mixer power supply (Soundcraft MTK 22) which I am trying to bring back to life and learn more about flyback converters in the process. This particular supply runs on 230VAC and ...
2
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1answer
55 views

How to tell which side of a Meanwell Encapsulated is AC and which is DC?

I received an AC/DC Encapsulated PSU from Meanwell. The datasheet Meanwell IRM 60 5ST seems to suggest that the the terminal block with two screws is for the AC while the terminal blocks with 4 screws ...
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3answers
43 views

Powering a switching power supply with a CTE (centre tapped earth) transformer

This question is an extension of a previous topic I posted regarding CTE transformers. I plan to use a switching power supply for an upcoming project, and I want to supply power to it from a CTE ...
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0answers
29 views

Running an Arduino from a dual 12V power supply [duplicate]

I build a regulated dual +/-12V power supply with common GND myself as specified in http://musicfromouterspace.com/analogsynth_new/WALLWARTSUPPLY/WALLWARTSUPPLY.php. Now I would like to run an Arduino ...
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1answer
79 views

Variable power supply 200V [closed]

I want to make a power DC supply with voltage rating 0-200V. I want it to be a variable power supply with voltage from 1V to 200v. What should be my approach?
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38 views

Capacitors to smooth output of cheap variable PSU

I've got a cheap variable PSU (Eventek 0-10A 0-30V) and I'm curious about building something to smooth the output voltage from it. I don't need to do this, the PSU is working fine for my needs right ...
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0answers
70 views

Input Protection for a Solar powered Microcontroller project

We have a PV-powered remote sensing project that has not been as reliable as we had hoped. Servicing the device is a hassle, and most of the problems have been around the power supply. The present ...
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23 views

how does power load sharing work when power supplies have different/variable capabilities/capacities?

I work with large networking gear fed by multiple AC->DC power supplies. One of the modules we use takes multiple AC inputs, when both inputs are active the module can supply 6KW of output DC ...
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1answer
41 views

Controlling a 5V power supply with a 5V signal [closed]

The might sound like a dumb need. Why if I have a 5V control signal would I want to control a 5V load? The issue I am up against is a voltage drop over a long run. In a home automation setup the ...
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1answer
44 views

Differential and Common currents in EMI Design

I need some clarifications about an application note from ON Semiconductor I have downloaded form the following site: http://www.icbase.com/pdf/add/on/AN-106-00003en.pdf The discription of the ...
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0answers
28 views

Relation of Voltage of a line and its cross section area?

For a given power delivered, if the working voltage of line is raised to n times, then cross sectional area of line conductor would reduced to?
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2answers
64 views

Bench Power Supply for ESC and KV on motor

I have a bench power supply it can provide ~10 amps and ~30 volts. Working on an autonomous car project I have an ESC to manage a brush-less motor. Two questions I cannot seem to wrap my head around: ...
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4answers
75 views

EMI Input filter in SMPS

While reading some application notes and standards about EMI Input filters, and from the fact that: Engineers are responsible for ensuring that a circuit can operate properly in the presence of ...
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2answers
41 views

Op-Amp Current Consumption

I’m using the LM7321MAX operational amplifier to supply a 12V digital signal from a 5V source. For the op-amp supply voltage: is it better to use something close/equal to my output value (like 12V) or ...
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1answer
64 views

Double wall AC socket with load on one side and power supply

I have on AC socket a load wire on the right side. I want to connect a power supply with separated load and neutral inputs. How to handle the case when a plug will be put on the top, next on the ...
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1answer
43 views

Choosing AC-AC PSU spec

I am wanting to provide +ve and -ve 12V power rails from a 12 AC PSU using the appropriate rectification, regulators, smoothing caps etc. The max current draw on the +ve rail is 1300mA and 800mA on ...
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1answer
47 views

PWM Motor Driver output voltage is enormously load - dependent

I've built this PWM motor driver (for a motor which requires 5A at maximum 24V and which I want to drive sometimes with 10V and other times at 24V). Here you find the datasheet of the mosfets. PS: ...
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3answers
1k views

PC ATX12VO (12V only) standard - Why does everybody say it has higher efficiency?

To my understandings, the new 12-volt only standard moves the 5V and 3.3V supplies off from the ATX power supply "box" to the motherboard. According to PC World (which is cited by Wikipedia),...
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0answers
36 views

Need some suggestion on 220 - 3.3 volt 500 mA power supply (Or 12 volts maximum)

I was planning to make some 220-3.3 volts,5 volts & 12 volts power supplies. I tried the configuration above in proteus (0.47uF, 275 volts RMS, Polypropylene film capacitor in series with a small ...
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0answers
28 views

What Common Mode Choke choose for EMI filtering at 250v

I'm designing a PCB with a microcontroller that have to handle 3 Relays. The main power source is an AC Inlet socket 250v, the maximum current for all the circuit from this source is 15A (I included a ...
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2answers
72 views

How to improve the accuracy of measured ADC voltage in a circuit connected to Vcc

The question is based on the following setup. As depicted there is an IC to measure the real value of the 3.3V supply voltage accurately. The measured value of the 3.3V source is transferred via SPI ...
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0answers
38 views

isolated Ground

I have a question regarding the ground connection of two isolated DC-DC converters. Is the connection advisable considering ground loops? Does it affect the safety? It is about the circuit seen below. ...
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0answers
18 views

Wiring 18 gauge 2 wire into type C or DC?

I have a Garmin fish finder that requires 12V-18V with 0.5A draw. Since I'm in a kayak I would like to use a light power bank (laptop lithium bank). Bank has 25000 mAh and operates with 2x USB (5V), ...
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0answers
35 views

3.3V LDO alternative using SOC analog output?

I want to build a little adapter board to connect an existing PSOC prototyping board (CY8CKIT-059) to QIIC connector (which is just I2C using JST 4-pin connectors). The QIIC standard calls for 3.3V ...
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0answers
53 views

Mini-UPS schematic - load-sharing of battery pack and power source

I am a beginner working on a mini-UPS project for a low-power server (computer). I've made the following schematic where I'm trying to achieve the following: Charge 3S 18650 battery pack BMS with 12....
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0answers
54 views

Why is the sensor value at the optocoupler wrong?

I am using six inductive sensors in my circuit. Four of them are working fine, but two sensors are showing very weird behaviour. I am using an optocoupler to read their output to the MCU for isolation:...
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3answers
70 views

What are the reasons two DC motors with same specifications and running with same power supply run at different speeds?

I am using two DC motors in my circuit. They are running on same single supply and also using same motor driver but one of them is running slower than the other one. There is 1.54 volt difference ...
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1answer
36 views

What is the 0V reference for MOV's input protection on power supply?

In some application notes for MOVs I see example usage in power supply design where each input line (N, L) from the mains are protected with a MOV to a ground voltage reference (as well as a ...
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0answers
74 views

Automatic power source selection circuit

I'm working on a project consisting of an ESP32 development board and a breakout PCB. I'd like the project to operate both with and without a USB cable connected to the ESP32. The ESP32 has an on-...
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0answers
26 views

Preventing power loss with battery backup

I would like to use a battery to power Arduino when the power is out, however I am not sure how to do it. The first simplest solution that comes to mind is using a usb powerbank, but I am not sure if ...
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0answers
57 views

PSU using -15V and +15V in order to get 30V? [duplicate]

I've been a couple of days looking for an answer, but without much success. I was wondering if I can connect a 30V audio device to the +15V and -15V of a PSU (+15V / GND / -15V)? Or is it preferred to ...

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