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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Power/Sense line connections when a relay in path

I need to connect a power supply instrument with (power and sense line) to my IC, this IC is separated by a relay. Can I connect/tie the sense line of the instrument close to IC in the layout (as ...
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Different power supplies

I have an the following components: Arduino Mega (9V) 8 relays (5V) 4 AC/DC voltage sensors (5V) SIM800L (4.1 V) How many power supplies do I need on my circuit board? Is it good idea to use one ...
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ATmega freezes because of power supply

I'm using a 10W/12V PCB mount SMPS for a project. In the same board I'm using an ATMEGA2560. When there is a power fluctuation, the ATmega freezes and all the communication is halted. How can I fix ...
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Buck converter with P-MOS and N-MOS [closed]

I used Hspice to simulate synchronized buck converter with 4V input voltage. Gate driving signal: VS1in S1in GND PULSE(0 4 0 1n 1n 372n 1000n) VS2in S2in GND PULSE(0 4 1n 1n 1n 370n 1000n) I cannot ...
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How can I simulate the power consumption and production and see the behaviour in real time (in forms of graphs)? [closed]

My purpose is to create a kind of monitoring power system where I can see the power production from different sources, and add power consumption also. The thing I cannot understand in this simulation ...
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2 votes
3 answers
381 views

Linear Regulator: What is Current - Supply (max)?

I am using an LDO to step 3.0V from a battery down to 2.8V, and I am trying to figure out what the "Current - Supply (max)" parameter means. Is it how much current can be supplied to the IC ...
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Is it possible to use a portable power bank to run a 40W amplifier? [closed]

I have a small 40W speaker that I use for home. I would like to use it outside, and I was wondering if a portable power bank could run it for at least a couple of hours. If that's the case, how big ...
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Power Supply Validation - What Matters?

When it comes to validating a power supply (for example, a buck regulator), what parameters matter? From the research I have done, I think that things such as ripple voltage, percentage overshoot ...
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Two different DC motors

I tried two different electric motors with one adapter. Both are 12 V but the current and power ratings are different, and one motor takes all the current. What should I do? Can you come up with a ...
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What does this box contain? Does it emit harmful radiation? [closed]

What does this box contain? Hello. I was wondering what would be inside this pharmacy cross sign box (the sign emits light during the day) and wether or not it could be harmful to be nearby for a long ...
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Weird PWM signal if powered by AC/DC source

I've developed a PWM LED strip dimmer equipped with a 230VAC to 5VDC converter and an ESP32 board (schematics below). If I hook up the oscilloscope to the input of the LED, the PWM signal shows weird ...
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Switching Losses In a Power Supply

Switching losses calculation in resistive load and inductive load are different. For a full-bridge dc-dc topology with a resistive load at the output; Should I calculate my switching losses like I ...
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2 layer PCB grounding

I have a 2 layer PCB that contains an ESP32, a LoRa module, a GSM module, some connectors to command relays and 3.3V & 5V power rails. My question is, should I set both layers as ground planes or ...
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What are the alternative ICs for OB2362 PWM controller? [closed]

I am really struggling to find an alternative to a PWM controller (OB2362) for my speaker power supply. Where I live its really hard to get these ICs shipped from China. I have looked up the datasheet ...
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Converting a x box power adapter into a 12vdc benctip power supply [closed]

How do I convert a x box power adapter into a 12vdc power source for testing my mobile audio equipment?
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2 votes
1 answer
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Off-grid computing

I am designing the electrical system for a school bus to tiny home conversion (skoolie, by jargon.) The current iteration is entirely solar powered, somewhere around 2640 W in panels, and likely 1000 ...
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How can I step down 24V to 5.5V and 3.3V with separate grounds?

I have a 24VDC 4A input that I need to step down to both 5VDC and 3.3VDC, but I need the 24V ground plane to be separate (isolated) from the 5V and 3.3V plane (these can have a shared ground). What ...
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4 answers
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Problem with building -12/12 V power supply and AC/AC converter

At the beginning I wanted to point out that I don't know much about electronics and I'm just starting my adventure with it. I recently bought an AC/AC 12 V power supply and to my surprise, it showed ...
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How to regulate 5V 3A to 3.3V for ESP32 and level up 3.3V to 5V on a PCB?

I'm making my first custom PCB with an ESP32-WROOM-32E. I am following this tutorial for the ESP32 part. My project requires a 5V 3A power supply but the ESP32 only takes 3.3V. The tutorial uses an ...
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How can I make this variable power supply go from 1.25V and -1.25V to 0?

I'm trying to learn and in this case I have a power supply circuit that has a fixed 5V, a 1.25 to 12V and a -12V to -1.25. I understand that the regulators I'm using have a minimum limit output of 1....
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Flyback converter DCM and CCM transition voltage

I am reading about flyback converter design and it is often said that the flyback converter should operate either in DCM or CCM. However, I understand that flyback converters can operate in CCM at low ...
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How to run this DC motor properly?

My beard trimmer has a very weak motor, so I want to upgrade it with this DC motor. I want to run it with 5V. What is an adequate power supply for this? Do I need a DC motor starter? What kind of ...
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Power supply overload protection work around

I have the following power supply here I need to switch on a contactor that uses around 3.2A inrush current for around 20ms (I cannot find the datasheet for this). Now the power supply breaks down the ...
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What causes voltage drop when powering both 8-relay module and DE-10 Nano simultaneously using 5V and 0.84 Amps through a power supply?

I have a robot that have uses DE-10 nano fpga board stacked on top of another pcb board that acts as power distributor to other components such as linear actuator brakes, wheel brakes, spray gun, etc ...
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Looking for a good text book describing active clamp forward converter

Can anyone refer a standard text book for understanding Active-clamp forward converter in detail? I could only find application notes and datasheets on this till now. I have gone through below books- ...
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Can i use a 19V 4A adapter for my 12V 4A control board? [duplicate]

I recently bought a control board for my lcd panel that needs 12 V, 4 A however the power adapter I have is 19 V 4 A. Would it blow the control board/lcd panel if i was to use the power adapter?
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3 votes
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Controlling device with Raspberry PI with different power supply

I want to control USB switch selector with Raspberry PI(RPi). The switch (amazon) have an external wired remote with micro button and couple of LEDs. I need to emulate a button press and ideally ...
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1 vote
5 answers
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If two devices both require 12V 2A power can I use a 12V 4A power supply to power them both?

The question title says it all really: I have two devices that both require a 12V 2A power supply, so I'm assuming that I can I just use a single 12V 4A power supply to power them both? I'm also ...
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Sensor power supply and GPIO pad voltage on different 1.8V rail

I'm using I2C to communicate between SOC and Sensors. My Sensor's power supply is 1.8V LDO output. And the I2C pullups are connected to same rail. But the pad voltage for my SOC GPIOs (where the I2C ...
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Easiest way to combine the current from 2-3 USB-C PD ports

I'm working on a project that has about a ~100W power requirement (5v, on average 20A, which needs to run for 10 hours off of the battery); and which needs to be portable and lightweight. I'm ...
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Power issue with NRF24LO1 and ATtiny44

I am super frustrated with my NRF24LO1 module and ATtiny44. The thing is when it is connected to an Arduino board it works perfectly, but when I try powering up using battery the entire system halts. ...
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Can't power DM542 stepper motor driver with "Drok" power supply vs. Keysight at the same voltage

I am trying to use a Drok power supply with a DM542. I am using 15V to to drive the DM542. For the Keysight U8031A, it works (the green light turns on.) For the Drok, I bought the 10A version, and ...
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How do you add multiple system voltages to a design? [closed]

I have been trying to search and been hitting a roadblock. My system uses a 42V Li-Ion Battery in an E cycle. The controller I am designing uses the following voltages 3.3V/100mA for Logic and ...
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4 votes
3 answers
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How to cut power to an embedded device without damaging it?

I have to build a system that shuts-down an embedded device by cutting off the power supply (in case it stops responding). The device I want to turn off is quite sophisticated (it is a custom PCB ...
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3 votes
1 answer
185 views

Fully charged battery voltage of devices

What is the voltage value of fully charged (and what is the value of fully discharged, out of curiosity) battery (1s li-ion) in common devices such as smartphone? Of course li ion provide ability to ...
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4 votes
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What is meant by the statement "Local bypass capacitors are needed to control EMC coupling with heat sink"?

During a talk, not sure what the speaker meant by the statement " We need to add local bypass caps to control EMC coupling with heat sink" He was referring to the MOSFETs in synchronous ...
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Can I have more voltage but ok wattage on a led strip? [duplicate]

I have 1.2 meters of a 12V 14.4 W/M LED strip, I also have a 64V power supply with 300mA, a.k.a an 18W power supply. My question is if the 64V could damage the 12V strip even though amperage is low ...
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1 vote
2 answers
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Is there any advantage if the PFC inductor is split in between +ve and -ve input line?

While doing the reverse engineering this is what I observed. The PFC inductor is having 8 set of pins , out of which 4 are shorted to input (+) and 4 are shorted to GND (input return). Obviously , ...
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5 votes
2 answers
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How do mains power supplies power their control circuitry?

Let's consider an isolated switching power supply that takes an 85 - 265 Vac input converts it to 400 Vdc using a rectifier and PFC boost converter converts 400 Vdc to a 50 Vdc output using a forward ...
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Can high amperes damage servo motor? [duplicate]

I have 5 servo motor Futaba s3003 and DC Adapter 6V - 2A, I'm asking if I used this adapter on these servos will be okay or not? single servo stall current around 250mA not sure and 8mA/idle
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A question of a controlling PSU safely

Is there a type of relay which is AC powered (does not require a DC supply)? Or any solution to the following issue? To simplify the question, inside an enclosure there is an SMPS and a module which ...
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2 votes
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What is the core material being used in CMC (Common mode choke) and DMC (Differential mode choke)?

The core symbol in below diagram indicates that it is an iron core material but Iam not sure whether it is correct. I see the same representation in many other circuit schematics as well. Below ref ...
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  • 2,051
2 votes
1 answer
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Why are differential mode chokes (inductors) not generally coupled?

I understand there are both coupled and un-coupled versions of differential mode chokes as shown below. Which one is better? I see most of the designs having un-coupled version. What is the reason? ...
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  • 2,051
3 votes
3 answers
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How can failure of Class Y capacitors lead to electric shock?

This article mentions "Due to the fact that equipment cases are usually grounded, Y caps require higher safety to avoid risks of electrical shocks to users" How can an equipment with ...
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0 votes
2 answers
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Guidance on cables in parallel from visualisation

I've been told cable 1 is in parallel with cable 2 and 3 yet I'm not visualising it just yet. Could someone clarify whether it's that from the source there are 2 paths? Cable 1 and cable 2-3. Thanks
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13 votes
3 answers
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How do constant current constant voltage devices work?

First of all can a device that is constant current also be at the same time constant voltage? In my head I just could not grasp how this device can work. Individually I understand how it works, ...
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What type of power supply is best for short circuit experiments? [closed]

I do a lot of experiments with resistive elements/heating elements, electroplating research work and similarly many other experiments. I'm currently using batteries, batteries work well for some time, ...
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1 answer
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Power injection LED strip: best method art instalation?

I'm building a modular art installation consisting of multiple 1 meter LED bars. From the power supply / microcontroller there are multiple lines consisting of 2 - 6 bars. The led strips I got need ...
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Would noise in general mean AC components only ? Is DC noise possible?

Noise refers to the unwanted disturbance in an electric signal. Would there be a DC Common mode noise? I guess it is not possible to have DC common mode current, let alone noise, as it doesn't have ...
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  • 2,051
0 votes
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Addressable LEDs (WS2815): power and data in a multicore cable

Would it be possible to use a multi-core cable to have power and data in the same wire? I'm using WS2815 LEDs. The total current needed is 9.6A. For a cable of 8 meters, a 2.5mm wire is needed. ...
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