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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29 views

Help identifying SMPS controller IC to change output voltage from 54v to 42v

I need a 42v DC adapter for charging a battery pack. I have this 54v DC brick from a broken PoE switch and want to change the output voltage. I've taken it apart and tried to locate the voltage ...
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28 views

Power supply circuit

When I supply the circuit at 48V, the power supply voltage drops to 2.5V. The circuit should be powered at 48V which will be converted into 24V by the switching regulator step down converter. When I ...
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33 views

IP 66 rated electronic enclosure

I am a mechanical engineer and I am developing a enclosure for one of the electrical setup. It has usb, ethernet and power supply ports. I am unaware how IP rated USB or any other USB port make sure ...
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47 views

Need design best practice: microcontroller controlled, variable, DC voltage source

I need guidance on designing a Variable DC power supply with the following characteristics: Microcontroller controlled DC output ~ 1V - 30V Current handling: ~5 amperes Power handling: ~50 watts I ...
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27 views

Understanding Overpower protection specifics

I am trying to understand how a particular ac-dc converter behaves in an overpower situation. The converter is the SRP-25 series from Integrated Power. From the datasheet (linked above), I see this: ...
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2answers
31 views

Power supply of 5V 1A causing erratic behavior of Tower Pro SG90,- what's the reason for this? Also occurs when using the MB102

I need to power an SG90 servo but am having trouble with erratic behavior when using a phone USB charger of 5V 1A or when trying to use the MB102. The MB102 voltage regulator also overheats within a ...
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84 views

AMS1117-3.3 outputs 4.4 V from a 5 V supply

[disclaimer - I am new in DIY and this is the first PCB I designed myself] I designed a PCB for a very simple ESP8266 12-F + RGB LEDs project. I assume that I am doing something fundamentally wrong ...
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33 views

Can I Simulate a SMPS Compensator on Matlab/Simulink

I've designed a type 3 compensator for a full bridge dc-dc converter, I just want to be sure about its stability and want to check its bode plots, I have a open loop model, I can apply pi control on ...
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98 views

Can I power a 100w amplifier with a 33w PSU?

I purchased a small 2 channel amplifier for a DIY audio project (Amazon link). I'm hoping I can connect it to a power supply I already have to drive a pair of small speakers. PSU: 19V 1.75A DC (33w?) ...
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How to drive 700mA LED cheaply?

I'm new to electronics and am trying to make a night vision circuit. A similar question has been asked before, but with priority on efficiency. I want to control a 700mA-1000mA IR LED using a 5v input ...
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38 views

BJT Collector-Emitter Breakdown Voltage

I'm developing a flyback converter with the FT838NB1 IC, and I got some doubts about the Collector-Emitter breakdown voltage of the integrated NPN switching transistor. IC datasheet link: https://...
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51 views

Protecting unpowered op-amp, or how can I use 12V to switch 3.3V?

I'm designing a Eurorack synthesizer module which includes an MCU, DAC (TI DAC8565), and TL074 op-amp for scaling and buffering the DAC output. In normal operation the module will operate from a +/-...
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35 views

Power cut when I put my laptop to charge [closed]

I have been noticing for the past few days that as soon as I put my laptop to charge, power goess off in the entire house and returns only after half an hour or something. What could be the reason for ...
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32 views

How to determine what voltage and current I should use for a Kanthal heating element?

I'm in the process of making a plastic forming "tool". It has a hot wire inlaid into the top. I have not come up with the power supply yet but have a few iron core transformers laying around....
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1answer
22 views

L298N Module 5V pin behavior on above 12V power supply

I have a lead acid battery that is barely above 12 volts (at 12.6) volts. This seemed enough to trip the switch in behavior that changes the 5V pin from output to input in the L298N motor driver ...
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1answer
43 views

Bench power supply - Inconsistent voltage output

It's been 3 years since I first bought my bench power supply, a Long wei LW-K3010D. This issue has reoccured to me a couple of months ago, but it usually "went away" when the PSU was ...
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41 views

Power output from a buck boost circuit is too low

Thanks to all who helped on the earlier part of the circuit - that's now fixed and working. Now the buck boost circuit to drive the LED is working, but it only puts out a very small fraction of the ...
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1answer
20 views

Using DALI-2 BUS interface(slave) to supply SiLABs EFR32xx

I am working on DALI bus converter, using EFR32xx MCU(SiLAbs) for home usage. My question is following.. Is it possible to get DC voltage from DALI interface to supply MCU unit(3.3V) to avoid stuff ...
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15 views

PSRR of buck converter (or boost)

I want to design a power supply based on a line frequency transformer (50 Hz in my case), and provide a stabilized voltage (15 V) after the rectifier (a classic bridge rectifier with tank capacitor). ...
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3answers
65 views

High gate pin current leakage on a p channel mosfet

I have added a P-MOSFET before my main circuit, between the v+ of the battery, and the Vcc main power line of the circuit, so that the battery stays disconnected and doesn't drain until I am ready to ...
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33 views

Need help identifying this SMD

I don't know what this component is. It's found on an adblue ECU for Citroen. I suspect it's faulty and need to order it.
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1answer
35 views

Replacing a NTC in Meanwell Power Supply

I have a query regarding replacing a NTC on a Meanwell dual output power supply. I managed to blow a stepper motor driver and the power supply last night (accidentally swapped a plug to a different ...
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2answers
55 views

How to size overcurrent protection?

I'm a begginer in electronics so I have some very basic questions. I would like to protect an OpAmp power supply rails from overcurrent. But I don't know at what value I should set this protection. ...
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22 views

Peltier Power supply problem

I am doing a project using a peltier TEC1-12706, however I am stuck on powering up the device. I am using a computer adapter power supply(20V;90W) and I it coupled with a synchronous buck-boost module ...
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37 views

Can I use an Apple charge Cube (5W power) through a Ripcord 9V to USB to feed a Roland SP 404 (2.7 W draw) Safely?

I am asking this as I want to be extra sure this setup does not damage my 404 Sampler as its an expensive item of mine and it's very dear to me so I want to be careful. Here is the scenario: I have ...
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1answer
51 views

How is it possible for a single power supply of a server to be hot plug?

How is it possible for a single power supply of a server to be hot-plug if it is the server's source of energy? How would the server still be on while the PSU is unninstalled?
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62 views

How to understand this formula.?

I am having ferrite core T60006-L2063-W517 Ferrite Toroids /Ferrite Rings Core 63x50x25 58.6uH@10kHz. I wanted to measure inductance of the core from datasheet it shows, Ferrite Rings Core 63x50x25 58....
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2answers
66 views

Power factor and recitfiers

If I filter the output of a rectifier using an LC circuit on the output, the input source would have a current draw with a square wave shape. I know that a lot of commercial transformers like ...
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2answers
52 views

Understanding stepper motor voltage and torque relationship

The specs of this Stepper Motor say at a voltage of 3.36 V and phase current 2.1 A, the maximum holding torque is 65Ncm. I'm confused though as on the datasheet there is no voltage mentioned, only a ...
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20 views

Can a faulty TVS diode cause power supply problems?

I have no power feeding the mosfet base with positive signal to switch on the relay that powers the ecu. The mosfet is to the top left above Q111. The TVS is the big SMD next to D100. The fault is ...
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1answer
26 views

How to determine the state of charge of a NiCD battery when charged via a Bench PSU?

I’ve a bunch of Sanyo Cadnica cells of various capacities in my possession. Though they are a bit old they have never been used and are NOS. I’m currently trying to charge a KR-FH 7000mAh cell. As per ...
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26 views

PSU Module for Raspberry Pi Zero

I need to build a small circuit to control some relays where I need to power a Raspberry Pi Zero from mains power using the GPIO pins. I saw this module: Mean Well IRM-05-5 5VDC 1A 5W. Is this module ...
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1answer
47 views

Drawing power from PoE without Ethernet

I was searching, but was not able to find an answer which is helping me. This is the first time I'm confronted with implementing something like this, so please excuse if this is a dumb question... My ...
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1answer
51 views

Is powering a 12v DC motor with 11.1 volts a bad idea? (3 * 18560 battaries)

I am working on an Arduino project where I will be controlling 4 individual 12 volt, 0.71 "Direct Current" DC motors, the arduino will be separately powered with another power supply. I'm ...
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2k views

What is the purpose of transformers on the output side of a DC power suppply?

I have a PSU that plugs into 220-240V AC mains (L&N, no ground) and outputs 9V DC to a single barrel plug. On the barrel plug side, just about 10cm before it, there's a little box on the cable ...
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44 views

Power Supply stopped working after soldering

I am new to electronic circuits. I built a basic led circuit on a breadboard to test everything out.It worked as in pictures,but the connections were not stable because the holes were very large.I ...
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4answers
2k views

Differences between oscilloscope, multimeter, and power supply voltage readings

So I recently got myself an oscilloscope and am trying to learn how to use it by starting with the basics, a circuit with a voltage source, and a resistor. When I set my power supply to 5V, the ...
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1answer
35 views

ASUS Laptop A/C Power Supply Output Doubled

My laptop power supply is rated for output to 19.5v, 7.7A. However, it's kicking out 41.5v. Strange thing is that before I measured this voltage, I have been using it to power on my laptop and it ...
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2k views

What is the correct supply voltage for LEDs?

I have a 5V supply power, three 5mm red LEDs, and each LED has 47-ohm resistor. Two LEDs are bright but soon as I connect the third one all of them become dim. Where am I going wrong? I'm new so a ...
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45 views

My 30A PDU is drawing 20.5A. It's L6-30P plug gets hot (65°C. Ambient: 35°C). Is this safe?

I have a home server setup that is drawing 20.5A from a dedicated 30A line. The power is supplied via a PDU rated for 30A (240V). The PDU's plug runs a bit hot, and I'm nervous if it would be safe to ...
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1answer
64 views

Generate a higher-than-power-supply voltage with capacitors

I want to design a circuit which is able to generate 8-10V from a power supply of 5V by chargin parallel caps and switch them to series connection (by using transistors) so they reach the desired ...
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1k views

How much can I push the limits of a device's VDD?

On a PCB I'm designing, I'm using two chips with very similar voltage requirements. Among other voltages, one requires 1.2v, and the other requires 1.1v. in fact, looking at the datasheet, the ...
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1answer
62 views

Strange behaviour Raspberry Pi 4

I am powering raspberry Pi using GPIO no 2, 4, and GND as recommended. The Pi only shows RED constantly ON led and does not boot. However, if I connect the USB power source it boots up. The power ...
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1answer
48 views

Constant Current of an XL4016 Buck Power Module [duplicate]

Hi have this buck converter : Step Down Buck 9A 300W Converter 5-40V To 1.2-35V Power Module XL4016 I've done my research, read some posts and articles but I'm still quite confused, some say a ...
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64 views

In an AC supply why does two single phase 110V wires connected to hot and neutral produces 220V

I have seen people connect 110V to the hot end and 110V to the neutral end of the socket to give a 220V to appliances like refrigerators. My understanding is that current flows, whenever there is a ...
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46 views

Mean Well power source doesn't start on battery

I power an amplifier using ADD-55 power source with "built in UPS functionality". As supposed, it charges a battery connected to "battery" output, and continues to run on it when ...
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2answers
49 views

Why does turning on/off one appliance make the other turn on/off on a power board? [closed]

I have a pedestal fan, and an elliptical machine (gym equipment) both connected to the same 4 outlet/port power board. I.e. a board you plug into a single wall socket and now have 4 sockets to plug ...
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1answer
68 views

Bench power supplies output

This is maybe a silly question, but when a lab bench power supply has 2 output channels that are both adjustable, can each channel be set at a different voltage than the other? Like this one provided ...
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86 views

Bridger rectifier producing non-equal voltages

I am making a bi-polar 12V power supply with a centre tapped (12-0-12) AC transformer. On inspecting the voltages after the bridge rectifier (KBU-4B), the negative side produces -26V and the positive ...
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38 views

How can I turn off a MOSFET when the temperature rises?

I am using a MOSFET as a pre-regulator. When the voltage is too high, the temperature of the MOSFET is getting too high. (Even if I take 15 mA current.) As a safety precaution, if the junction ...

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