Questions tagged [power-supply]
An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.
9,293
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Exploding/superhot capacitor in XT AC-DC PSU
I have a commercial replacement PSU that I am using for a vintage XT class computer which has 4 DC lines (5v, 12v, -12v and -5v). On fitting the PSU however, the PC operated but after a while under ...
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Transformers & Electric Fast Transient protection [closed]
My PCB has problems passing the Common Mode EFT test (IEC 61000-4-4). The PCB has a transformer (4.5VA, 230V to 12V) which is itself surge protected and internally fused with CE-markings. I tried to ...
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Does the RCD go before or after the MCB?
I am going to connect a 4 pole RCD and MCB to the input of a power supply. Which one should I connect first, the RCD or the MCB? I have seen them connected both ways.
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Mix of power supplies
I am struggling to understand what happens when two power supplies are connected:
Both supplies build a whole circuit, the rest of the second supply is left out for simplification
Both power supplies ...
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Speaker and buzzer sound levels issues
I have designed two test boards to evaluate the sound levels of several speakers and buzzers. While the buzzers are functioning as expected, the speakers are producing sound levels that are ...
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What happens if an MCU boosts its own supply voltage while running?
I'm designing a low-power, battery-powered sensor node using an ATtiny1626 microcontroller (1.8V~5.5V supply with low clock speed), powered directly from 2x AAA batteries (various chemistry, let's say ...
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Need cheap variable positive/negative switching bench power supply with CC
Just for fun I want to make a lightweight, cheap, adjustable positive/negative bench power supply. "Lightweight" means that using an old PC ATX power supply isn't suitable as a basis. ...
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Pi Pico shorted after working fine
After working for a couple of weeks, a pi pico is just shorted.
It is used on a board that gets a midi signal as input and controls six mosfets as output.
When powered by usb maximum power is drawn, ...
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OP Amp Circuit works with bench PSU but not laptop
I have a CMOY op-amp headphone amp I've cobbled to together mainly from the design here:
https://tangentsoft.com/audio/cmoy/misc/cmoy-tangent-sch.pdf
It works fine on my bench PSU but switching to an ...
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Clearance and Creepage for the Nets
I have made the schematic of the double pulse test setup and have also highlighted the NETS for the PCB layout. Test will be done at 100VDC (HV+) and current ~ 30A.
Please suggest where the clearance ...
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Clock Driver - What's wrong with my H-bridge design?
I'm trying to design a drive board for a vintage slave clock. These things take an alternating 24 V pulse once a minute to advance the display.
Since the drive board should be powered by 5 V, I wanted ...
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Using two supply rails (on supply and output pins) with 74HC595
I have a 74HC595 connected to an STM32 to drive a bunch of LEDs using fewer GPIO pins.
I want to reduce the current flowing through the 3.3V regulator IC which supplies the controller, and want the ...
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Output voltage doubling on power supply, possible culprits?
I've had to repair a few of these power supplies that are from moving head effect lights. They've all needed to be recapped and a couple have had bad variable pots, but this one is getting an output ...
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Schottky diode fails probably due to temperature - LED driver
I have designed a 3-channel LED driver using the Diodes Inc ZXLD1371. One channel supplies 6 RED LEDs in series, the other channel green LEDs and the other blue LEDs, all power LEDs. Due to the Vf ...
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Is this power supply safe to use? [closed]
I bought a power supply for my DC motor. The power supply should have a short circuit protection, overcurrent protection and overvoltage protection. May someone check if all these protections are ...
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Current of Interroll EC5000 Drive Roller
I'm designing a conveyor belt system using Interroll EC5000 drive rollers (35W 24VDC). Calculating the current from P/V I get 1.46A. However the rated current on the datasheet is 2.4A. So my question ...
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Why do online sellers of power adapters sometimes hide the output voltage and current in their pictures? [closed]
I am shopping online for a power adapter and I've noticed that sellers often hide the output voltage and current in their pictures. Is there a reason for that? Examples:
https://www.amazon.com/...
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Combining a MP2307 (12 V to 5 V) & AMS1117-3.3 (5 V to 3.3 V)
Powersource is from a motorcycle battery (12 V) for powering my device (a ESP32 MCU) and I thought combining a MP2307 (12 V to 5 V) & AMS1117-3.3 (5 V to 3.3 V) would make my device last longer. ...
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Understanding Stepper Motors
I am relatively new to using stepper motors and I plan on using two bipolar NEMA 17 2.1A stepper motors controlled using two TMC2226 motor drivers for a project. I am trying to understand how current ...
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How to power servo motors?
I built a robotic arm consisting of three MG 996R servo and three MG 90S servo. How to power them externally? I used three batteries of 3.7 volt but they are getting discharged left and right.
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Custom buck converter putting out 1V instead of 5V
I "designed" a simple buck converter, which is basically a clone of the 5V reference design in the TPS6293x datasheet. Unfortunately, my converter is only putting about 1V (closer to 0.95V). ...
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Which is the more important switching parameter in MOSFET datasheet? Turn on/off/delay times or Input/Output/Reverse capacitances?
I see both capacitance and timing details mentioned in the MOSFET datasheets.(Ref:)
Which one should be considered for comparing the MOSFET switching performance between 2 MOSFET part numbers?
Note: ...
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What is this part from an LCD monitor power supply?
A Samsung monitor (S32D850T) has this axial glass component on the power supply PCB. It was identified with a reference designator of “SA” and represented with a schematic icon on the back of the PCB ...
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USB C Cable - Which conductors do what to power a Raspberry Pi4b
Good day to you all,
I am looking to power my Raspberry Pi 4b from an external 5v supply. I know I could just put the 5v supply to the raspberry pi 5v/GND pins and power it this way but this does ...
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How can I separate the switched-mode power supply from the RF PCB to avoid interference?
I want to construct an autonomous RF PCB module powered by a solar panel. To achieve this, I have obtained solar harvester and battery charger integrated circuits (ICs) designed to charge a Li-Po ...
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Circuit to convert 14.8v battery with max 4a discharge current into 12v, 9v and 5v output?
I am making a robot with multiple devices mounted on top. I am planning to buy either a 14.8v or 11.1v Li-ion battery which has internal BMS limiting maximum discharge current to 4A. Now I need 9v for ...
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Do I need to add a filter for an isolated DC-DC converter?
I have purchased three CUI Isolated DC-DC Converters, the models are VHK50W-Q24-S5, VHK150W-Q24-S12 and VFK600-D24-S24. I wonder you could help / guide me to the correct use of them.
Questions:
I saw ...
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Design a ESC using TI's DRV8332 [closed]
I'm actively engaged in the development of an Electronic Speed Controller (ESC) utilizing the DRV8332. I'm seeking clarification on the purpose of the bootstrap pin in this specific application. ...
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How to connect a 12V electromagnet to 220V power adaptor
I'm not very familiar with electronics, but I want to create a basic automatic pet feeder for my outdoor dog house. My idea is simple: a wooden box with a floor that drops at a set time, controlled by ...
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Powering a passive usb hub with an external power supply? [closed]
So i have a generic usb hub with 4 ports, and as a usb 2.0 normally gives 5V at 500ma, could i just cut positive and negative and wire it to an external power source?
I tried it and pc won't recognise ...
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Electric potential - 2 power supplies
I'm studying among other things electrical engineering and I'm kind of in a discussion with a colleague about an 'experiment': he claims that when i measure the voltage between the + output of power ...
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Maximum safe wattage for solenoid and duty time
Please can somebody put my mind at rest?
I work on a machine that is unpowered until fully assembled and it has a push-pull solenoid (195222-237).
It has become apparent that we need to cycle this ...
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MCU Breakout Power Considerations
I am designing a custom breakout board for my ESP32 Devkit-C used as a CNC controller. The ESP is powered from a Mean Well 5 V PSU (with a Schottky diode and some capacitance to ground). In this ...
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Comparing different scenarios for DC-DC power delivery between two PCBs
For my robotics project, I am dealing with a system that is broken up into different components, that are mechanically decoupled (a head and torso part, connected via a multi-wire cable). I want to ...
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SIMPLIS - Buck CM from C. Basso Website
I took from the website of Christophe Basso a simplis simulation. I have some questions about it to be sure to understand it. Here is the schematic of the simulation:
It is a current mode buck ...
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Stabilized the current at 1.5V
I'm designing a stabilized power supply 220v AC/5V DC. So far everything is working correctly but I'm thinking of how to limit the output current at 1.5V?
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STUSB4500 shutting down when I hook-up my wireless charger
I'm using the STUSB4500 to generate 12V, 3A which generally seems to work. I'm configuring the STUSB4500 NVM registers using the SparkFun_STUSB4500.h library and the code looks like so:
...
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What happens if one of DC serial power fault?
The circuit as this picture:
I create +/-5V dual rail powers for +/-Vs of OP-AMP with 2 power modules(IRM-03-5).
COMM does not connect to GND.
What happens if the one of following fault occurs?
...
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shop equipment runs on 15v, want to DESIGN wiring so that a standard tool battery can run it
I work in a collision shop. Our headlamp aimer is cordless, but the battery is always going bad, it is an internal battery, and we charge the aimer with a brick style charger that plugs into the base ...
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Is keeping average current low a way to avoid damage to PSU and MOSFETs?
Here’s the scenario: I have to power two heating plates which drain 18 A each but the PSU is only rated 32 A. The initial plan was to attach each plate to a MOSFET module rated 30 A and control them ...
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Can someone please explain this circuit? SMPS, Bridge Rectifier, Transformer
What do these optional components do?
Schematics: https://crtdatabase.com/crts/jvc/jvc-bm-h1300su
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Speaker draws way more peak current than RMS calculations would imply, how do I deal with that?
So, for a project I'm working on, I'm trying to drive a small-ish speaker (Visaton SL87XA, 4 ohm version) using a FET H-bridge driven rail-to-rail from a RE46C100 horn driver chip in what's ...
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Low power, isolated, compact 230AC to 3.3DC power supply with very low heat dissipation? [closed]
Need an isolated, compact 230V AC to 3.3V DC power supply with very low heat dissipation. No heating is extremely important as – unfortunately – this regulator will be placed enough close to a ...
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Parallel diodes in a single package - is it really double current rating?
As an example: https://www.onsemi.com/pdf/datasheet/mbrb20100ct-d.pdf
I've seen discussion where it says diodes in parallel may not increase the current capacity. BUT the datasheet clearly says it's ...
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What transformer should I use for high power switching? [closed]
I'd like to build a high power switch mode power supply. I'm still not entirely sure how to do this, but I am playing around with some circuits for now.
My thoughts was to have input voltage (wall ...
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Significance of higher noise gain of op-amp for AC applications
I am trying to understand the reason why the noise gain of an op-amp is being forced to a higher value while driving capacitive loads and designing for AC applications.
As shown in below schematic ...
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How to generate 0-150V adjustable DC output? [closed]
I wish to generate a voltage range of 0 - 150V output @ 2A Max to drive an actuator, and I don't really have a lot of great ideas at this point.
I have 2 power sources available, one is 220V AC, ...
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Power on unused pairs of Cat6a Ethernet cable / home made voltage regulator? [closed]
At the end of the afternoon, I have been given the following task : try to get a sensor working over a 100 m Ethernet cable (Cat6a, i.e. 4 twisted pairs, each pair shielded individually). The ...
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Power Supply has clean voltage but Raspberry PI doesn't like it
I have made a home made power supply using an LS-A7632-PT transformer I yanked from an old electronic. It takes 120v input and steps it down to somewhere around 6v and has two 6v legs. I then have a ...
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Replacing solar panel of landscape lights with higher wattage panel
I have RGB solar spot lights in my yard that come in a set of 3 parts each, which connect together to form the system.
Solar Panel rated at 6 V / 4 W output.
Battery Charge Controller, this one has a ...
