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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240VAC In, 16.5VAC 40VA out, Power Supply Solution? [closed]

I'm struggling to find a suitable 16.5VAC 40VA power supply. It is for a DSC Alarm system and as I'm in the UK I need to step down from 240V AC Mains to the 16.5V AC required for the alarm. The ...
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TIDA ref design produces a 50Hz signal on output

Follow on question from previous post: I am trying to test this design from TI. This is used for detecting leakages. I connected up my setup like I have shown below. However as mentioned in the ...
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50Hz "noise" on power or ground line of power supply

I have a power supply that creates a 50Hz sine wave when I connect my oscilloscope to it. simulate this circuit – Schematic created using CircuitLab This sine wave looks like this below. ...
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12V to 3.3V using LM3489

I ran into an issue with the LM3489 not actually attempting to switch the transistor at all. I'm not sure why it won't start up. PGATE sits at 12V, VCC and when watching it seems to make no attempt to ...
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Wire size: is a 16 AWG wire the same 3x 23 AWG wires?

I'm building an LED installation and I was wondering if I could use the cat6 cables I already have. I've calculated the needed wire area to be 16 AWG (D 1.4mm, 1.65mm2) (for 5 meters). Would this be ...
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Synth PSU ripple/noise filtering

Noob alert. I'm building a modular synthesizer (musical instrument) and I'm having a problem with building a good power supply for this use. I bought a +12/-12 VDC power supply and read that ...
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Does a battery drain if used in series of a power supply to boost voltage?

If I place a rechargeable battery in series with an active power supply to boost the voltage, will the battery ever need to be replaced?
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Multiple power banks to handle temporary increase in power demand

I have 1 PoE+ (Power over Ethernet) port from which I need to power 5 Raspberry Pi 4s. The recommended power supply for Raspberry Pi 4 is 5.1 V / 3 A which gives 15.3 so 5 Pis will require up to 76.5 ...
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Wiring power to many LED Strands

I have read as many threads on this site and others related to this, but haven't found any that specifically answers my questions. I have about 20 WS2811 LED Strands. They are 12V and each LED uses ...
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12VDC 3500mA filtering, what are voltage regulators and capacitor values

I have a 12VDC 3500mA power supply and I would like to filter the outgoing voltage from any noise. My plan is a simple scheme: output from the power supply -> capacitor -> voltage regulator ->...
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ESR of aluminum electrolytic capacitors

Is there any way to calculate the ESR of electrolytic capacitors for high frequencies? In aluminum electrolytic capacitor datasheets, the dissipation factor is given with low frequency(100Hz-120Hz) ...
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What energy is produced in cable connecting the two terrestrial magnetic poles following this discovery of a variable magnetic field around the earth? [closed]

Principle of operation with scientific sources: Earth's interior is a far from quiet place. Deep below our surface activities, the planet rumbles with activity, from plate tectonics to convection ...
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No suppression on flyback voltage spike

I've designed a 12 to 24 volt 1A flyback converter with uc3845 controller. The problem is the voltage spike on drain so that with a 1k resistor and a 220nF capacitor, it is picking to about 60 volts. ...
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Long term issues with AC/DC converter in always ON application

We have designed an "always ON" electronic home automation device which goes behind the switchboard (inside the wall.) This is the first commercial product that I am designing, so bear with ...
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What impact can I cause if I neglect voltage ratings?

For instance, a DC motor rated 48 V and 0.6 A (29 W) being supplied with a solar panel rated 18.2 V and 2.75 A (50 W). Can it run?
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Using Power to Determine if Circuit Components are Compatible

When I am designing circuits, I usually look at the current and voltage specs of my source to determine if my source is sufficient for my circuit. For example, if I have a load that requires 500mA of ...
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Bridge Rectifier Problem or something else?

I am designing a 30V 5A power supply and after simulations working fine I decided to make it on actual hardware. But during the first run, something shorted and the power supply didn't even turn on. ...
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Flyback leakage inductance effect

The document "Under the Hood of Flyback SMPS Designs", talks about the leakage inductance effect (on page 6). I have some questions about that. The below questions are from fig 5. Why high ...
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Tesla AC motor: what is this component?

Can anyone explain how the pictured component that looks like a long stem connecting to the generator G operates? Most specifically of the left side connecting to the terminals? My understanding is ...
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Interpretation of Generation and load power at a bus and understanding of slack bus

I was going through the IEEE 14 bus system data from [here] (https://ijireeice.com/wp-content/uploads/2013/03/IJIREEICE2E-a-shkti-Computation-of-final-21.6.14.pdf). I know that there are three type of ...
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I want to design a buck converter, so i need your help [closed]

Vin max>=100v Vout=14v-30v Fsw=50khz Iout=3A max can i get any shortcut method without adapting the conventional design? Thanks John
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Replacing safety capacitor [closed]

My hp z820 power supply has been failed after 7 years of work. I suspect that the safety capacitor (between line and ground) is the problem, but I can't find any information scripted on it to be a ...
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Why does my MOSFET always burn?

I have a circuit that uses a MOSFET to power a resistive plate to heat it up. The problem is that this MOSFET always burns after a few seconds. Let me explain my circuit: First, the outlet AC voltage (...
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Circuit for charging a coin cell battery while also powering main circuitry

I am looking to design a USB rechargeable device that feature a small microcontroller set up to run at low clock frequency driving a few LEDs. I'd like to power it off a 2032 coin cell battery or ...
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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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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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1 answer
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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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6 votes
1 answer
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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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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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3 votes
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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3 answers
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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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