Questions tagged [power-supply]

An electronic device that supplies electrical energy to a load. It can be AC or DC input. Typically DC output.

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Modelize output impedance of a system thanks to a power supply

I have a system which is made of a load and a power supply. I do not have the power supply for the moment but I would like to know the effect of the "power supply" on my load. For this, I ...
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Recommendation for a DC- DC regulator IC with built in current limiting funtion [closed]

Following to the question, I am looking for an adjustable current regulator IC with current limiting function that is not very tiny and can be easily soldered with common tools. The specifications ...
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How does a voltage surge/spike affect the wall wart power supply's secondary side?

In the photo, you can observe an old-style adjustable wall wart AC to DC power supply, typically composed of a primary winding, secondary winding, rectifier, and capacitor. If a voltage surge or spike ...
xchcui's user avatar
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How does this part of push-pull converter work?

I took apart a power supply unit of some old kitchen lamp, and inside was this push-pull converter. It has an "optional" part, shown at the bottom of the schematic, which is not actually ...
Борат Сагдиев's user avatar
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Cascaded LDO and buck converter: low current problem [closed]

I am designing a power circuit where I set up 2 voltage rails (5 V and 3.3 V). For this circuit I used a linear regulator (for stability at the 5 V) and subsequently a buck converter to set up the two ...
rtx_q505's user avatar
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How to connect multiple devices using one USB port and a breadboard?

I have an audio device with 8 channels, every 2 of which need to be powered by a 5V power outlet. Up until now, my lab used USB chargers to solve the problem. But now I have to improve upon it, and I ...
Prothy_the_Prothean's user avatar
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Why fuse the centre-tap in a single-ended full-wave bridge-rectifier PSU?

I am looking at an on-line schematic and struggling to understand the function of the fuse. The schematic is from https://turneraudio.com.au/leakampmods_files/schem-leaktl12-protect-2005.gif The ...
Fish's user avatar
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Load switch for sequenced application of voltage

This is a follow-up to my previous question. Now, in order to properly power up an LCD, the datasheet states to apply VGL first, then VGH and AVDD. I want to do this with the circuitry below. AVDD: 8 ...
fcipaq's user avatar
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10 votes
3 answers
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Lots of electrical noise at boost converter output

I'm trying to implement a boost converter using TI's TPS55340. After spinning up the design, I have found that the output ripple is almost 8x what I expected to see given my design parameters. First, ...
esologic's user avatar
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Along with its idle power, will an inverter draw only what it needs to feed a load? [closed]

RV 12v 6000w inverter; 12v 500ah battery ,feeding 1800w load
Chris Alleshouse's user avatar
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LCD power down sequence

I am trying to build my own gaming handheld. I chose a parallel RGB LCD (Samsung LTP500GV-F01). Using a boost converter by TI (TPS61085) I was able to generate all necessary voltages. (I know there's ...
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Is it possible to use an Efuse for protection with negative voltage?

Following to this question, is it possible to use an efuse with a negative voltage power, to eliminate the need of the required big heatsinks?
Shamooooot's user avatar
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Routing Power vs. Power plane (high frequency)

As a beginner, I'm curious about handling fast analog signals with nanosecond rise times. Do the decoupling capacitors of ICs need to recharge rapidly to supply charge effectively? Would employing a ...
Tim Buktu's user avatar
-1 votes
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18 views

ZVS driver 230V 50Hz [closed]

I'd like to build a ZVS driver powered induction heater which is powered by the line voltage out of the socket, in my case 230V 50Hz, but in my simulation I can't get a good DC supply. What can I do?
Morli Pro's user avatar
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How can I choose the right stabilizer for a 3-phase 415 V supply system?

I have a question about how to select the right capacity of voltage stabilizer for a 3-phase supply system. That system has the following type of load and capacity: Two 1 hp 3-phase motor, 440 VAC (...
Bhushan Waghe's user avatar
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Designing a Li-ion charge-discharge controller circuit

I have an interview test task to design a device that contains several sensors of different purpose and a heater. The problem is that the device has to be portable, so I calculated the required Li-ion ...
2222's user avatar
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Power supply for 9.4 GHz magnetron [closed]

I need a power supplier for a magnetron with following specifications. Can someone help me out with the design? Frequency 9380 to 9440 MHz (Fixed) Output power (Peak) 25 kW Duty cycle / Pulse ...
Aurimas Karosas's user avatar
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Monitor output voltage and current using Power supply [closed]

I have a power supply called TDK Lambda z+ series (650, 0.32). I want to monitor the output voltage and current of my circuitry using this supply. Now from the user manual, I got the option where I ...
mj541's user avatar
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4 answers
217 views

How to add a current limit for a dual rails power supply?

I want to make an adjustable power supply with -18 V and 18 V separately adjustable outputs. I found this circuit might be the best and simplest one to do the job. How can I limit the output current ...
Shamooooot's user avatar
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1 answer
79 views

Op-amp circuit type and explanation [closed]

Can somebody please let me know what type of op-amp circuit this is and how it works?
Shreelakshmi Nagaraj's user avatar
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Derivation Control to output transfer function of switched capacitor dc-dc converter approach valid?

For the control design, it is essential to have a plant model of the Switched-Capacitor-based DC-DC converter with a Voltage Conversion Ratio (VCR) of 1/3 implemented in a series-parallel topology. To ...
Kwok's user avatar
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Is it possible to send 18 watts via USB-A?

Actually this might be a cable question. I see wall warts out there advertising 18 watts. 3A USB Type-A & USB Type-C Wall Charger The spec says "Output Voltage- 1 x USB Type-A 18 W" I ...
mardukes's user avatar
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Can I power an ESP Dev Kit board through its PH2.0 battery adapter

I have a WaveShare ESP32-S3-Touch-LCD-4.3. I want to create a case for it. For simplicity I would power it through the USB-C connector, but that'll increase the size for my case. On the underside of ...
Pieter van Ginkel's user avatar
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1 answer
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Voltage regulator not working [closed]

I am trying to generate 5 V here, but I am getting only 3.3 V. I can see the drop across Q3 is more than 2 V. Can someone suggest what the error is? Also, what changes should I make to replace Q3 with ...
Embedded Enthusiast's user avatar
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1 answer
84 views

Which one would be easier DC to DC or AC to DC [closed]

I have 440V 3 phase power that will be full wave rectified to 600V DC. My question is, would I be better off plucking one of the phases and rectifying the 120V AC to 12V DC or one of the DC rectified ...
ircsmith's user avatar
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Op Amp Selection, Linear DC Power Supply

I need help selecting an Op-Amp for a project I am working on. It's been a long time since I worked with Op Amps in school. So long ago, 741 was a high-performance op-amp. The project is a Constant ...
Dereck's user avatar
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7 votes
1 answer
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How does this PSU start? The IC needs to be powered by the secondary of the transformer, but it depends on the IC switching

Here I have a switching power supply diagram that I found on the internet. I have a slightly different one for which I would like to adopt this same scheme for starting process so that I can keep the ...
itasuke's user avatar
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2 answers
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Display Board that turns [closed]

I’m building a flag-shaped display box for patches. I will need 3-4 dozen motors I assume running parallel that will turn 180 degrees every set amount of minutes (maybe 3 or 5). The motor will be ...
D Rbeav's user avatar
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1 answer
68 views

Amplifier supply voltage difference [closed]

Is it possible that a slight voltage difference between voltage rails of a symmetrical supply can make noise if connected to an amplifier? If yes, how do I get rid of it?
Anton's user avatar
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3 votes
3 answers
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Need help inverting DC voltage without op-amp

I am implementing digital voltage and current measurement on an old power supply. Due to the design of the supply, I am forced to use the positive output probe as a common ground for my ADC and MCU. ...
Atropin's user avatar
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Powering options for Arduino project

For my project, I have these components: Arduino Mega 2560 Rev 3 HC-05 Bluetooth module LCD display Logic Level Shifter Currently I am powering the Arduino Mega using the Vin and GND pins via 6 AA ...
Vagabond4761's user avatar
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1 answer
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Higher amps power adapter for charging a battery

My car wouldn't start, so I bought a jump starter. Basically it's a huge 12v rechargeable battery. It comes with a 12v 0.5a power supply for charging, which gets pretty warm. I trust this power ...
Daniël van den Berg's user avatar
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1 answer
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Enabling power supply using microcontroller: schematic review

I am using two regulators in my design. They need to be enabled by a microcontroller. The microcontroller is working at 5 V. The regualtor P/N is a TPS62160QDSGRQ1 and the microcontroller is an ...
Analogkid's user avatar
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1 answer
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Water level sensor XKC-25 on boat battery

I am working on a PCB that involves three XKC-25-NPN 12 V units on a boat. I have a question about 12 V DC. When the motor is on the DC voltage can go over 12 V and reach 13.8 V. How can I regulate ...
Khales Naim's user avatar
-1 votes
1 answer
66 views

Can an MN27 alkaline battery power my 12 V, 0.16 A motor?

I have two motors in parallel rated for 12 V at 0.16 A. They generate a small 14.4 pounds (64 N) of force combined at a slow speed of 30 mm/s. The motors open and close a door for this project. The ...
logpillow's user avatar
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4 answers
1k views

Design review request : First AC design - Is this dangerous?

This is my first board with AC. I'm planning on using it to power an ESP32. Overall the consumption will be much less than 0.3A. I'm putting two HiLink HLK-PM01 units in parallel, with 0.3A output ...
arkadian's user avatar
1 vote
2 answers
66 views

Modern and popular ICs for 5 V, 3 A switching regulator [closed]

I'm designing a simple power supply with the following requirements: Input: 120 VAC - 240 VAC Output: 5 V @ 3 A Reasonable cost & future-proof It seems like the LM2576 switching regulator has ...
user120632's user avatar
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1 answer
22 views

How do I get correct a correct pwr_ok signal to use a non-ATX power supply in a PC?

I have an old Power Mac G5 power supply from 2003. It's an excellent quality high-power unit which I'd hate to have to throw out. The problem is that it's 100% proprietary. All voltages are the same ...
matias valdez's user avatar
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18 views

How electromagnet reacts to 6v vs. 12v [migrated]

I am wanting to pull my car trailer with a 1950 Cadillac. The car is running with the original 6 volt system. The trailer is a dual axle with brakes on each axle. The system on the trailer is 12 volt. ...
Bradley L Johnson's user avatar
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0 answers
78 views

How can I build a bipolar (+Vgs,on/ -Vgs,off) driver with BJTs for MOSFETs?

I am beginner in driver circuitry. I am trying to do a MOSFET driver that can work at over 300kHz with a current sink capability of 10A. I also want it to give a bipolar output like -10/30V. I found ...
DidiNano's user avatar
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0 answers
22 views

Having Class 2 circuit together with class 1 circuit in regards to NEC

There is often confusion between the IEC Class II power supply and an NEC Class 2 power supply. The former describes the insulation protection to shield users from an electric shock, while the latter ...
Mohd's user avatar
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1 vote
4 answers
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Is it OK to use a transformer as an AC power supply source?

I work as an IT specialist in company. The company acquired a used Axis 232D+ surveillance camera. This camera is special. It requires a 24V AC 1.5A power source (as specified on p.48 here.) It was ...
Ivan P.'s user avatar
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1 vote
1 answer
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Does current HAVE to return to source voltage, or Prefer to?

For simplicity I will be specifically talking about a 220V/ 120 V transformer in most residential homes in the US. Under normal circumstance, and assuming neutral is connected, the current flows ...
Cody Stone's user avatar
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2 answers
147 views

Purpose of Schottky diode in this schematic

I have come across the power supply management section used in the Verdin Development Board, addressing overvoltage, undervoltage, overcurrent, and reverse voltage protection. While I understand how ...
mastermind's user avatar
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2 answers
40 views

For an active power factor correction circuit (PFC boost,) is there any characterisation graph between input voltage and power factor?

Just like the regulation graph (ouput voltage vs. input voltage) for a voltage regulator, is there a similar graph (power factor vs. input voltage) for a power factor corrector circuit? My aim is to ...
Divya K.S's user avatar
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1 answer
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Would an AC EMI filter capacitors contribute to inrush current?

Shown below is an EMI filter for an AC input. My doubt is when I analyse the inrush current, should I be considering the contribution due to all three capacitors? a) Differential mode capacitors b) ...
Divya K.S's user avatar
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-1 votes
1 answer
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How to determine maximum supply voltage of a circuit

I am working on a small electronic device. I am trying to find the maximum supply voltage I can inject into the circuit before damaging one or multiple components. The circuit (in CEI) is the ...
Munshine's user avatar
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2 answers
77 views

Create 21 V power source from multiple 5 V sources

Can I create a 21 V power source out of multiple 5 V sources? Set the scene: I have a mini projector, it runs off a 21 V power source. I have several 5 V power packs that I use for charging iPhones ...
Conor's user avatar
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Power supply voltage drop with load

I'm trying to fix a old soviet power supply and I think it is a switched-mode power supply. When I plug it into the wall it makes a high pitched sound around every one second. The output voltages are ...
SierraWD's user avatar
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1 answer
60 views

Simulation time for Full bridge

This is a full bridge circuit which I am trying to simulate in Ltspice with a snubber. When I use ideal switches instead of MOSFETS, the simulation works fine. But when I use the real mosfet models, ...
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