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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160 views

How to interpret LTspice simulation outputs for improving dual channel boost converter design using LTC3788

I am working on a boost converter design using the LTC3788. I would like to take advantage of the dual output capabilities of this chip to produce 24 VDC at 4 amps on one output and 48 VDC at 2 amps ...
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117 views

Transistor parrallel to Voltage Regulator

I'm encounter following schematic in a product. It gets 110VAC and provide 5V DC to the board. After many inspection I still can't understand what Q2 and R4 do in this design. First of all after T1, ...
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1answer
238 views

Supercap backup power - delayed power on

I'm trying to figure out how to make a backup power that will allow my SBCs to safely power down in case of power outage. What I thought to use are supercaps (2 in series for 5.5V) that will first ...
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1answer
122 views

Where to connect shield in USB power supply for Arduino?

I'm making a 5 volt portable regulated power supply (using LM7805 regulator IC) for Arduino UNO. I'm planning to use a USB connector as its output socket, this way I can just plug and power the ...
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1answer
62 views

Power supply higher voltage on startup

I've got a power supply that is suposed to provide 5V of DC voltage, I use it for powering an LED Strip (WS2812B) and I've measured the voltage right after turning it on and it's about 7V (for no more ...
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68 views

Switching between two power supplies to power bluetooth board

I have a Bluetooth board in which I wan to have the option to power it by a battery or power it by a wall adapter. The power input is a 5mm x2.1 mm plug with two wires (positive and negative). I have ...
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64 views

How can I evaluate on-chip bypass-capacitor's capacity based on the topology?

The transmitter I designed has been showing lots of jitter.I think there's something wrong with the layout topology.Pad of the power supply is a little far away from the circuits by connection through ...
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614 views

Power supply of board based on tp4056 with protection gives too low voltage

I have a project on small pocket board with a Li-Ion battery so I made a pcb with power section based on a tp4056 board (with protection), with LP2985IM5X-3.3 stabilizer. TP4056 charges the Li-ion and ...
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3answers
687 views

Excessive noise in amplifier circuit when switching from DC power supply to AC-DC adapter

I'm working on breadboarding this amplifier circuit before transferring to a perf board. When we power it from an adjustable DC power supply set to 12V, the audio output sounds clear. When we switch ...
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156 views

5VDC 4mA to 5V 200mA

Arduino gives a PWM output of 5V dc 4mA, the requirement of my project is 5V 200mA. how do I boost current from 4mA to 200mA by keeping voltage as 5V as the signal is a digital signal?
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60 views

How to choose a 3A power supply for a project involving a micro controller?

I am designing a project where a ATMega 328p chip triggers a 3V step up transformer to produce a 7kV spark gap. I have found some 3A transistors which I can use as obviously the 238p cannot supply a ...
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643 views

Powering a servo from a 5v, 3.3 amp power supply

I am building a Mearm robot using an Arduino to control it. The kit came with 4 servos which are rated at 5v. The Arduino doesn't output enough power to power all 4 servos so it suggests buying an ...
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192 views

UCC28C44 flyback start-up problem

I have a problem with a design of a flyback converter for a power supply. I am using UCC28C44 PWM IC. Converter should star up with at least 200V and VDD should be charged to 14V when 15V should ...
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298 views

Is this a well-implemented power supply for driving logic from a LiPo or NiMH battery?

I'm designing a power supply for a system which requires a 3.3V logic power rail, driven by a user-selected battery. My requirements are as follows: Input voltage between 7V and 18V - usual ...
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664 views

Replacing ceramic capacitors with film in PSU

Some Behringer Truth B2031 came back from a friend and they're acting up. first thing I noticed was the four .1uf ceramics that are in parrellel with the bridge rectifier diodes have experienced ...
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883 views

High voltage, low current, power supply for night vision gen. 1+ tube - single AA cell or 3V

I would like to build a new power supply for a gen. 1+ night vision intensifier tube, the current supply is robust but big and heavy plus the input is 9 to 24V. The tube it self requires approximately ...
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111 views

Question about various power/ground sources in one circuit

I would like some advice on how to handle different power/ground lines on the same circuit. I am not clear about how to wire-up multiple peripherals etc. with their own power sources in a single ...
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102 views

Hybrid amp filament power supply

I'm designing a power supply for hybrid amplifier (tube + discrete semiconductor power amplifier). I need 30V for power amp and 60V for tube. Also I need 6.3V for the filament (6DJ8 dual triode doesn'...
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245 views

Connect Arduino to existing circuit with seperate power supply

I have an existing closed system that exposes several inputs that I would like to drive with an Arduino. The existing system (Neptune Apex Controller with break out box) is designed to sense the ...
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130 views

Microcontroller reset on mains connection

I'm helping someone build a static VAR compensator. We figure it'll be evident that the power factor is being corrected if there's a display that shows AC voltage and current waveforms, so one can see ...
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465 views

Generating a low noise, +/- 5V dual rail supply

I'm planning to use TI's DCV010505DP DC-DC converter to generate a low noise, +/- 5V dual rail supply with a ground node. I plan to use a cheap wall-adapter power supply to power the DC-DC converter. ...
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761 views

Input filter for class d amplifier

I have built a ~50W class d amplifier powered by a 12V SMPS. My problem is that the output of the SMPS has high frequency noise. I know that the noise is not audible but I would like to remove all of ...
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120 views

Preferable mixed mode (SMPS + Linear) PSU topology

I'm designing power supply for my hybrid headphone amplifier. It will be powered from external SMPS of unknown quality. Amp's power supply contains linear part (linear regulator + rail splitter) and ...
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78 views

Closed enclosure thermal design the right way

I have a circuit board that works quite well (processor, screen, power supply). It has been tested successfully for an open aluminium enclosure, but now it will need to fit a rugged 100% closed box. ...
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512 views

Need help interpreting a printer PS label

I have an HP OfficeJet 8600 that won't power up. First it wouldn't turn off, but after doing a standard partial reset described on several websites, it now refuses to turn on. Took the CMOS battery ...
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277 views

How to safely split a power supply into two?

I have 6AA batteries connected to this UBEC, giving me 5V 5A. Now I have an Arduino Mega and this SIM900 GPRS shield which I need to power. As I have a steady 5V I can power the Arduino through the 5V ...
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140 views

What's wrong with my SMPS circuit?

I've proto-typed a switch mode power supply with variable voltage and current control using a MAX1763 IC. I've powered it on and for the most part it works great, I can control the voltage using the ...
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277 views

TPS560200 - Output voltage wrong

One of the students at my uni has laid out a PCB with a TPS560200 step-down converter. However, instead of 5V it only outputs 0.9V. I've checked the feedback resistors and they are correct*. The ...
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193 views

Voltage Divider?

I am designing a piezo micropump driver that feeds into a piezo electric transducer that mists a liquid. Both of these designs have been testedindependently and now its time to integrate. BST of ...
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511 views

L200 regulator power supply circuit design help!

So here is the thing, I'm far from an expert in electronics, I'am pretty good with following a schematic but not designing one. I have made a power supply based of the LM317 that worked out pretty ...
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116 views

Constant power supply with high-voltage “restrike”

I'm still playing with electrolytic chemical reactors. After looking at the results from a constant-current circuit I'm realizing that what I really need is a constant power supply because, depending ...
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101 views

FET Default on, Turn off with Optocoupler

I am relatively new to electronics and having trouble designing a circuit for a redundant power supply, which I would like to switch to battery if the voltage regulator turns off. This will be ...
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3k views

Need help repairing adjustable DC power supply stuck on 48V

I have a cheap benchtop dual-output adjustable DC power supply. One of the outputs is working alright, the other one "burned out" when it was left loaded somewhere near 80% of its maximum for 24 hours....
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218 views

Raspberry pi B+ internal power supply ckt?

I have just started to study about raspberry pi B+ (data sheet) Can somebody explain the working of power supply circuit (individual component wise) starting from pg 14. How and why it is ...
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122 views

Optimal power supply for RF switch

I am planning to use an RF switch to pulse a signal >1GHz. Specifically, I'm interested in the ZASWA-2-50DR switch from Minicircuits (http://194.75.38.69/pdfs/ZASWA-2-50DR+.pdf) due to the low rise ...
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51 views

How do I create a visual and/or auditory indication that an inverter has switched off and the mains are back on?

EDIT I came to know that o/p of inverter is AC. I apologize if I sounded silly previously. To be more specific, How do I create a visual indication an audio indication in my living room such ...
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560 views

Esp8266 and uln2003 restarts

I am trying to drive 6 LEDs from an Esp8266 (esp201 break out board). Because of the Limit current of 12 mA the esp can do i want to use a 7way darlington Array to Power the LEDs. I have programmed ...
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154 views

Is a Zener and a fuse enough protection?

We have a power chain that runs from an alternator, to a 24->12 dc regulator, to a battery charging circuit, to a 12 v battery. We were thinking of using this circuit minus the ac-dc converter part ...
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97 views

The op amp error based Power Supply, Driving the load…?

My question is based on the MOSFET circuit shown in a question by uMinded.. "High Voltage Series Pass Transistor - Low Voltage Control" here This circuit is a little unique in that it is not using a ...
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87 views

Is this an adequate design for a +3.3V / +9V / -9V power supply?

I'm building a small audio processing unit for my own needs and because of all the ICs used I need to use bipolar supplies + 3.3V for the digital parts. I'm going to build this over a pref-board, this ...
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357 views

Sharing power source for LED strip and stepper motor

I'm making an AC powered lamp with retractable console uling 12 V LED strip and stepper motor. Originally no automation was planned so simplest AC-DC converter was bought. Like this (declared by ...
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349 views

over-heating with AMS1117-1225L

When connected an external voltage to vout of this 5v regulator, the chip get very hot. I connected a 4v to its Vout, and it draws 500ma. The protection diode from vout to vin doesn't help. My doubt ...
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47 views

Placing power supply problem

In my project I want to use two power supplies of the type HLG-600H-24 with a power of 600W each and a efficiency of 95%. In the installation manual it tells me that each power supply should be at ...
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194 views

Beaglebone Black - Power sensors after boot

I am new to electronics and want to build a small thermometer/humidity sensor powered by a beaglebone black to get started on something practical. My issue is that the board doesn't start when the ...
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558 views

How to switch between two 220VAC motor power supplies?

I am not an electrician, electronics engineer or anything that will relate me with your interesting profession, but I am a Project Engineer, Mechanical Engineer, etc. and I am working in my spare time ...
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639 views

Reverse current frying a boost converter?

AFAIK, most boost converters incorporate a diode or some mechanism for ensuring that current flows from the battery to the output. For instance, TPS61030's datasheet says that This device however ...
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341 views

ATmega2560 freeze on start up

My arduino mega freezes on startup. I am powering it with an ATX power supply and the Arduino does nothing after power is applied, until I hit the reset button. I thought the issue was the slow ...
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157 views

ATX power supply only 0.1A from 12V rail?

I have a project which requires a high current output (potentially 60A). Rather than get a lab bench supply, I got hold of a Corsair ATX AX1200i that can supply a max of 100.4A on the 12V wire. I've ...
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109 views

0.8mm PCB for a PSU circuit

I am working on a PSU that converts 230 VAC to 12Vdc (0.1 A). The board has the necessary clearance and creepage distances. Would it cause any safety issue (IEC60950) if the 0.8 mm (or 1.2 mm) thick ...
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166 views

Safety/Quality issues by modding PC PSU to be floating.

Since I don't have enough money at the moment to purchase a good bench power supply, I want to 'mod' a PSU. In the first instance not by opening the PSU, but just by making an adapter that also puts a ...