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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22 views

Supply power for a relay with same source as pump connected to relay

I would like to know if relay will work normally when I supply electric power for the 5V relay with the same source (classical 5V USB charger) as the source for a water pump (3.3~5V) connected to the ...
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45 views

Power Regulation from Arduino Micro

I am using the Arduino Micro as the microcontroller for an optical detection circuit that consists of a photodiode, trans impedance op amp, and ADC. Using the +5V power pin from the Arduino Micro to ...
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41 views

How do you charge a LiPo and manage system load (using solar power)

I am designing a wireless sensor node and want to implement a solar power charging circuit. From my research, I'm aware you shouldn't use a LiPo to power your system load while it's being charged. ...
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39 views

Power ORing with power switch with reverse current prevention

Power ORing is usually done with diodes so that the power source with higher voltage is powering the load. Can these diodes be replaced by power switches such as SiP32508 that doesn't have output ...
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2answers
69 views

How important is it to connect Live and Neutral correctly in a Power Supply

I am about to wire up this power supply to my mains voltage via a flippable Plug (Schuko). https://www.az-delivery.de/en/collections/stromversorgung/products/copy-of-220v-zu-5v-mini-netzteil Its AC ...
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80 views

Random MOSFET failure in MPPT Buck converter circuit

I'm making a buck converter with a microcontroller driven PWM signal to drive six N-channel - well heatsinked - MOSFETS to perform MPPT into a lead acid battery from a solar panel. The system works ...
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1answer
53 views

Verifying a PSU provides as advertised

I want to ensure I get 3A from a powerbank that claims it is giving 5V/3A output. It is for a project using Raspberry Pi (but this question is not Raspberry Pi specific) and I don't want to damage it. ...
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69 views

MOSFET as reverse polarity protection and power switch too

We have a system where there is main power supply as well as a single cell Li-Ion battery (4.1V to 3.3V range we'll use) as a backup battery. Its a low cost and PCB area constrained product. The idea ...
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50 views

How can I increase the output current of this buck converter?

The general rule of thumb is that you shouldn't put switching regulators in parallel unless there is some sort of sync control or they're specifically designed for parallel. Buck modules exist that ...
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1answer
38 views

How to calculate the power consumption of an ultrasonic distance sensor?

I’m working on a project that will be using an ultrasonic distance sensor continuously throughout the day. I want to figure out what the theoretical power consumption would be over a number of hours ...
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2answers
56 views

Voltage spikes and noise at power down

I'm using two LM2596 regulator module, set to 3.3V and 5V. Both regulators are powered by a Meanwell DR-30-24 PSU. The device supplies power to an STM32F103C8 microcontroller and other auxiliary ...
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Individual power supply on/off [closed]

Hopefully someone with better knowledge can guide me to the right solution. What I need help with is to turn on/off power supply individually to items. As it is today I have in power signal let say ...
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1answer
54 views

Monitor PSU troubleshooting (Monitor sometimes doesn't want to turn on) [closed]

My Packard Bell Viseo 223ws monitor sometimes doesn't power on. I'm guessing that it's a problem with the PSU since it sometimes works flawlessly but other times the power button doesn't even light up....
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3answers
48 views

Powering a pressure transducer

I am new to building testing setups. I have an Omega PX603-30VAC5V pressure transducer that I need to power. I have a Rhino Power Supply PSP24-060C that is listed as 24VDC/2.5, the pressure ...
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1answer
89 views

TPS55340 boost circuit not making desired voltage

I've created a 12 VAC -> 24 VDC boost power supply based on the TPS55340 regulator. I used a reference design from TI's WEBENCH tool, with some selected part substitutions for parts availability, ...
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63 views

ESP32 3.3V Voltage Regulator

I'm designing a circuit which will include an ESP32 and 5V DC power provided by a AC/DC SMPS. The 5V is needed for other components in the circuit and I would like to power the ESP32 through its 3v3 ...
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2answers
83 views

What value does this capacitor have? [duplicate]

I am trying to teach myself how to repair ham radio equipment. I have a blown power supply I am trying to repair. I need to know the capacitance of this part: It is from an Icom IC-PS15 power supply. ...
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61 views

External power supply on a 2nd Atmel

This video is about using external power supply on a 2nd Atmel. I saw in the picture the Ground and Vcc connection like this: The Arduino Uno is connected to the ground (from USB ?) and the - of 5V ...
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37 views

USB-C power delivery, how to power 20V pd device from "dirty" +20V source?

I want to charge my laptop from a solar pv panel. It charges via USB-C and so I bought a cheapo usb solar panel off ebay and a "power bank". Turns out, the "power bank" is only for ...
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1answer
89 views

What are the benefits between buying off the shelf DC-DC modules and a bespoke design?

I'm designing a product that has a 24V input, but the voltage rails on the product are 15V, 12V, 5V and 3.3V. The 24V is from this supply. To get the lower voltage I've been cascading cheap modules ...
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4answers
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Bench power supply with no minimum output voltage

Just like many other electronics hobbyists, I am trying to build a variable bench power supply with 0-30 V and 0-5 A output. I have gone through various sources to get a basic idea of how to design ...
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75 views

Is this a good way to power a USB device externally?

I drew this schematic to power a USB device externally. Is it generally correct?
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1answer
92 views

Ground drone schematic and pcb review

I am creating a small ground drone and have come up with the following design. To control the motors I use mosfets driven by proper drivers, while I also placed a gps module (L80-M39) and an ...
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1answer
48 views

What aspects of alternating current can damage an appliance if input incorrectly?

I have done some basic electrical work in residential construction, however I am attempting to adapt a 50amp outlet to a 20amp outlet so that I can power a very expensive machine. I noticed that the ...
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1answer
61 views

Purpose of Input Resistor On AC/DC Converter?

I am currently in the process of sourcing an AC/DC converter module for a project I am working on. I am thinking about using the PSK-3D-5 120VAC to 5VDC converter, which gives the following example ...
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1answer
31 views

How long can I power up a nodeMCU

I have a nodeMCU esp8266 and I'm going to power up the nodeMCU as long as possible but I need to know is it good to the health of nodeMCU. In other way I am going to power the nodeMCU forever.(...
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43 views

Can I power a nodeMCU using 3.7 battery

I have a nodeMCU board (3.3V) and a li-ion battery with 3.7 V. Is it alright to give the power supply from that battery?
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4answers
151 views

How can I produce dual +-12V supply rails from a single 12V supply?

I designed transmitter and receiver circuitry, with LT1214CN op amps with +-12V rails, and now realized I'm limited to using a 12V external supply (I was asked to use it). I've considered possibly ...
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1answer
100 views

How to limit current output to 1A from 12V lithium ion battery

We are making a simple bot that uses a 12 V lithium ion battery,which is connected to a power module, for 5V and 3.3 V output. Now I connect a TB6612FNG motor driver with ESP32. The ESP32 is powered ...
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45 views

Voltage inverter with output drop

Could someone help me on an inverter project?. I set up this project below where the microcontroller generates two PWM inverted 180° from each other with a duty cycle of 50%, 60 Hz. I pass this PWM ...
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2answers
126 views

What happens when a source cannot supply enough current?

What happens if my circuit draws more current than my source is able to supply? For example, if I have a source that can supply 1 V and 1 A and I attach it to a resistor that is 0.5 ohms, the circuit ...
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58 views

USB receptables for power delivery? [closed]

I'm not totally sure this is the right place to ask, but does anyone know of any USB C receptacles for low voltage and current power delivery? I can't find a good option with a good schematic.
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75 views

LDO power dissipation

I am trying to design a split power supply from lithium-ion batteries to use with different portable audio projects. In order to have a stable power source, since it comes from batteries, it has to be ...
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1answer
77 views

How do I tell KiCad where the power is coming from on a Eeschema

The problem I am a beginner/novice using KiCad and in creating PCB's, so I do not know much about these things. After following tutorials from YouTube I managed to create or copy symbols to my ...
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1answer
85 views

Voltage spikes in a power supply

I've been testing a power supply I've made and noticed that a +/- VCC voltage spike occurs when a resistive load is attached/disconnected (or when a power is lost) due to capacitor transients. The ...
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2answers
113 views

Power supply for LED strip causing bad powerline internet connection

I looked up what a good voltage and current would be good for my strip and happened to have what the power supply itself is labeled as a class 2 power supply. It outputs 12V at 500mA DC. The strip is ...
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87 views

Is there a solid state switch for DC circuits?

I am working on a noobie IoT project and I am stuck. Please help! I bought an ESP32 microcontroller and I want to use it to activate a garage remote for a couple of seconds upon an HTTP request. The (...
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2answers
91 views

Ultra low ripple symmetric +/-5V USB powered converter

I have a signal processing circuit that requires symmetrical +/-5V, about 0,5A each with a requirement that the output ripple should be as low as possible (ultra-low ripple.) I have tested various ...
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40 views

Bench PSU leaking voltage to case and not working properly

Tl;dr at bottom Recently I found old bench power supply in my closet and tried to test it but display kept on displaying 0.00v and 0.00a - the power supply is voltage and current regulated and has two ...
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32 views

unexpected power loss in double conversion ups

I have picked up a 6kva (4000w) online ups made by MGE (now eaton). It is a used otherwise it functions correctly. The AC input and output rating is 220v. The battery pack is 240v DC the charging is ...
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1answer
69 views

Digital voltmeter and power supply design

I have a digital voltmeter, it has 3 pins, 2 for power and 1 for measurements, if I connect its ground to the circuit's ground, I can measure any 1 point of the circuit, but I can't measure between ...
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113 views

Audio amplifier: output power higher than input?

I'm checking the audio amplifier Behringer NX6000D. In the doc it says The NX6000D power amplifier packs 6000 Watts (2 x 3000 Watts @ 4 Ohms; 2 x 1600 Watts @ 8 Ohms)...` In the quick start guide / ...
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41 views

Please explain what causes AC-OFF-DET to be high (3v) and what turns on/off PC401 LED

On connector CN2 you see AC-OFF-DET signal. This signal is supplied by the power supply schematic if an error condition is detected, however I am having trouble understanding what is setting it ON to ...
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29 views

Choosing a transformer for a ready-made bipolar regulated power supply unit

I'm working on a 10W AB class power amplifier that I would like to power with an already assembled linear regulation board sold by Audiophonics: https://www.audiophonics.fr/fr/alimentations-regulees/...
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34 views

High voltage input of inverter circuit

Above is a 12V DC to 120V AC inverter circuit and its step up voltage. Question: Is it possible to step down, which means 240V DC is being stepped down to 12V AC because if the mosfet and transistor ...
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65 views

Isolated grounds in power supplies

Can someone assist me with understanding why some power supplies for instance DC to DC power supplies sometimes use more than one ground in their circuit? I have noticed that also some components on ...
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901 views

Why are there extra resistors in this op-amp circuit?

I am trying to replace the LM4250 with a newer op-amp. My take on this circuit is that the op-amp is configured as a unity gain voltage follower that drives a push-pull amplifier to provide the ...
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1answer
64 views

Getting 5 V efficiently from 6 V lead acid batteries connected in series

I studied electronics but became a programmer instead, and have forgotten a lot. Now I need to run Arduinos and other 5 V boards in 12, 24 and sometimes 48 V marine and off grid environments, where ...
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54 views

Do inverters exist that can synchronize phase to each other?

A DIY-er who knows barely enough to even touch an inverter wants to put two in parallel to power a refrigerator. I'm explaining to him why that's a bad idea, but it makes me curious: Does anyone make ...
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1answer
60 views

Component identification help

I had a component on a monitor internal power supply short out, unfortunately it was quite damaged but I am hoping I can identify it and replace it to repair the screen. I'm sure you can tell which ...

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