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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48 views

320x240 dot matrix LCD power connection

I'm interested in buying some LCD for my amateur Z80 retrocomputer, and I'm searching for 320x240 dot matrix screen with 8-bit parallel bus. What is common for them all, they need 3 independent power ...
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23 views

EMI Filter For Low Power SMPS

I've designed a 1.25W buck converter which is fed by 220VAC(85-265) and has a 5V output. Now I'm trying to design a EMI input filter for it. I don't have a PE connection so I didn't use a CM filter so ...
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1answer
51 views

Regenerative Load Circuit

In a recent question it was asked whether a boost converter could be used to "recycle" power output by a buck converter being tested. There are quite a few commercial regenerative electronic ...
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68 views

Why does my MOSFET only allow current when it is switched polarity (drain to GND)?

This circuit acts strangely. I think the MOSFET is correctly placed. However, whenever I connect it to the power supply (1V 0.1A for initial testing) it doesn't let any current through - unless I ...
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30 views

4 channel relay with Arduino issue, probably simple but need help

This is my equipment: 12V DC (10A) PSU powering Arduino Uno then 2 x Buck converters (3A) (one powers two solenoids, set at 9V, the other powers a 3.5V motor) connected to a 4-channel relay (active ...
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51 views

What is the best location of a (damped) LC network here?

I'm using this circuit to create the analog supply in my usb-device: After the high-side switch, the incoming 5V is boosted to 5.5V and then regulated back down to 5 volts. The entire analog part ...
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1answer
152 views

Is it possible to power a monitor with 5 V if the power supply specification is DC 9-36 V?

I'm attempting to turn an NES clone into a handheld device, therefore adding a power supply and a monitor as well as a few other minor things. After some research, I pulled all the parts together I ...
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3answers
127 views

Circuit to enable / disable VCC and GND

I need to design a circuit able to enabling and disabling a voltage source and its respective reference (GND). The power supply has a adjustable voltage output and can supply 12V, 5V, 3.3V and up to ...
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32 views

A question about interpreting a supply's spec

How can I interpret this plot for [this][1] supply: --to be edited-- Does it mean the max output current will decrease linearly with temperature but the voltage will remain the same ? What is meant by ...
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4answers
53 views

Is this the correct way to compute or the resistor for the ATMEGA? and how to compute for the fuse?

Is this the correct way to solve the resistor for the ATMEGA? The ATMEGA can only handle 6.6mA 4.98v @ 16Mhz but my transformer outputs up to 2Amps of current. This is my first time that I designed a ...
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43 views

Powering and injecting 2200 LEDs

I am seeking advice/validation for powering a long length of LED strips. I know it's a lot of questions so I'm grateful for any feedback on any of this. I'm planning to run about 37m of strip lights ...
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40 views

Can arcing in IEC 60320 C13/C14 connectors damage a device?

I have a 'guitar effects power supply' built to supply 9v/12v/18v power to 🎸 guitar effects pedals. It is powered using a IEC 60320 C13/C14 power receptacle and cable. After using this device for the ...
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2answers
32 views

Why is the Irms so different from Isat in different power inductors?

I'm looking at power inductors for a DC-DC boost converter clocked in the 500KHz range (but KHz could change if necessary). Here are two examples: Example 1: Irms=55A, Isat=140A, 70nH Example 2: ...
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3answers
115 views

L78S05C only supplying 4.88 volts?

I'm working on a linear 5 V power supply for the first time. I'm using the L78S05C as I was hoping for a little elbow room on the amperage over the standard 1.5 A version. Circuit tested perfectly on ...
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Howto: RF HV power supply (13,56 MHz, ~30 kV - 50 kV, 1 kW - 3 kW)

I hope you can help me on this one. Short recap about me, I am a maker and I had a vocational education some 30 years ago as engineer in HV (up to 48kV) in industrial facilities. So I am aware of the ...
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2answers
90 views

Will this work? Transistor to keep the uC power supply on once a trigger happens

I am trying to have a switch (momentary) on a remote, that will send power to the LDO. But as the switch is momentary, the power will be disconnected. Can I have a transistor or some Mosfet to keep ...
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1answer
48 views

Is there any way to reduce the miller effect on a mosfet bridge?

I got miller effect on a full bridge and I'm trying to get rid of it. Is there any way to reduce the miller effect on a mosfet bridge? I'm using opto drivers with bootstrap circuitry to drive.
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35 views

Is there risk of damage if I power a fan with my bench supply but connect the yellow wire to a fan header on a computer that has its own power supply?

I'm trying to debug an issue with a fan's voltage and how the motherboard handles the tachometer. I want to power the fan from my bench supply to give it a constant 5v but connect the yellow pin to ...
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1answer
31 views

Can I use DC20V/6.75A instead DC20V/6.5A Power Adapter [duplicate]

Can I use DC20V/6.75A instead DC20V/6.5A Power Adapter for my VisionTek VT4000 - Dual Display 4K USB 3.0 & C Docking Station?
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1answer
67 views

It okay to use 12V 2.5A adapter instead of 12V 1A? [duplicate]

I have a piano keyboard that uses 12V 1A adapter . The adapter was not working anymore so i used another one which was 12V 2.5A but after 45 minutes of usage the keyboard got little heated up in the ...
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47 views

Can I build a 3-phase transformer bank out of single transformers of different KVAs?

Can I build a 3-phase transformer bank out of single transformers of different kVAs? Can I build a 3 phase transformer bank with 2 transformers of additive polarity and 1 of substractive polarity? The ...
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2answers
57 views

Wattage of adapter to size my inverter

I have a couple of appliances that already have their power specified on them. However A few of them do not. The device is powered from an external power brick adapter. One adapter for instance has ...
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3answers
62 views

How to convert 220 volts AC into 12 volts DC using a transformer?

I tried to build a circuit that could convert 220 volts AC into 12 volts DC: My voltage output is as I wanted but the measured current is always blank. Can anyone explain why this is happening and ...
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43 views

Unused output of a flyback transformer

I have a flyback transformer. It has 2 outputs. I'm going to use one of them on a flyback converter. Should I leave the second output of the transformer unconnected or connect a load to it?
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106 views

LDO that doesn't drop out?

I have a scenario where my Vin is 12VDC and my (small inductive) load is 7VDC. I need a voltage regulator that would satisfy following conditions: if the Vin > 7VDC + Vdropout, then Vout = 7VDC if ...
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3answers
328 views

linear regulator with high current capacity [closed]

Recently I have seen that adding 7805 in parallel is not really a good idea as the load on each regulator may NOT share equal load, is there a regulator whose output voltage is 5V and can supply at ...
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1answer
49 views

Stepper motor driver TMC2209 is powered from microcontroller logic pins

I am doing my first steps with a TMC2209 V1.2 stepper motor driver and a NodeMCU. This is my circuit: I power the motor side via 12 V supply (12 V on the lower rails). In the circuit, this is ...
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3answers
104 views

LM317 Voltage Regulator

I want to regulate a voltage suppose 60 V, but I only have an LM317 (or any similar voltage regulator IC) with voltage regulation range of 30 V max. Is there any way I can use a combination of two or ...
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3answers
116 views

DIY power supply [duplicate]

I am trying to build a variable power supply to replace my batteries. The power supply should have a constant DC voltage just like batteries maximum current will be 10mili Amps Max voltage should be ...
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40 views

Can I connect two DC outputs from a nine-way powersupply to power one camera? [closed]

I have a nine way power supply for a closed circuit TV (CCTV) system. One of the cameras is far away and at night turns on and off due to power loss caused by bad cable quality. A few meters away is ...
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1answer
45 views

Power distribution switch for auxiliary battery

I'm designing a power distribution system, for connection an auxiliary battery to my system. The idea is to use a power distribution mux, similar to TPS2124 from TI. I want to be able to control the ...
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29 views

SCI six trak vintage synth power suppy issues / repair

I am "repairing" my SCI six-trak analogue synthesizer after retrieving it out of storage, turning it on only to see a spark from the power switch and now the unit powers on but doesn't "...
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2answers
61 views

Polarity Question for Powered Home Subwoofer

I picked up a powered home subwoofer at a garage sale. It did not have its power adaptor. All it shows is 12V DC (by the symbol) 2.5A. But it does not show the polarity anywhere on the subwoofer. ...
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2answers
58 views

Dual Power Supply for single 10m LED Strip Run

This is my first time here so sorry for any wrong formatting. I am currently creating a project where I will run my wall with 10 meters of addressable LED strip (Made up of 2 x 5 meters rolls). I have ...
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1answer
84 views

5V source directly or 12V stepped down to 5V

I'm setting up a circuit to handle a 5V LED strip, which consumes between 500mA and 1A in bursts. The power source is a serial ATA cable which has 5V and 12V lines from the PSU. Without a capacitor ...
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1answer
42 views

Can I operate 2 electromagnetic locks using the same power supply?

I'm using this power supply: Specs: Input Voltage: AC90V-AC260V 50-60HZ Output Voltage: DC12V Momentary Current: 3A/5A Persistent Current: 3.5A To operate my ...
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4answers
259 views

Design considerations when combining multiple DC DC converter with the same input, but different output

I've used TI Webench to implement single DC DC converters in a circuit, so I'm always confident in using whatever TI generates for me. But what are some design considerations or modifications required ...
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56 views

Smart phone USB-C Data and Power

I have a Samsung Note 9 with a weird technical issue that has to do with usb standards. If I plug in the phone to a PC using a USB-C to USB-C cable, the phone will charge and transfer data to the PC. ...
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79 views

Limit current to a load

I'm making a little heated greenhouse. I have three 1.2 ohm 5W resistors and a 5V 1A power supply. Everything is controlled by my Arduino through a MOSFET. Now, I would just need 5W of power to keep ...
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52 views

Powering Arduino and 5 volt relays [closed]

I am creating my first real electronics project. What I am trying to achieve is controlling several 5 V relays using an NodeMCU (Arduino Compatible) connecting the digital output pins from the NodeMCU ...
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43 views

DIY BLDC - power supply sizing?

I am currently in the process of building a sensor-less 3ph axial flux BLDC with concentrated windings. I’m thinking 12s10p but have not yet decided. It’s just for a project - not for real world ...
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2answers
75 views

What is EMC recommended circuit and is it necessary?

I'm building a power supply with five isolation dc-dc converters, here is their data sheet https://www.cui.com/product/resource/pdqe15-d.pdf The data sheet mentions a EMC recommended circuit, below a ...
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21 views

Dual tracking PSU: how to derive set voltage for second “half”?

I'm fiddling aroud trying to design a dual tracking PSU, based on the LT3080-based design by eevblog/Dave Jones. The general idea is to use a microcontroller obtain \$V_{set}\$ in the range of 0-2V, ...
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67 views

Car battery charger

I'm a student of electrical high school. I have tried this project, to make a car battery charger with an Arduino-powered voltage meter. My problem is that I made some research about making an Arduino ...
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38 views

Power Dissipation - Sizing up Power Supply Needed

I wanted to understand what size power supply is needed for the following: I am getting confused with the Icc value and Ioh,Iol etc values in the datasheet. My question is, how much current will I ...
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3answers
102 views

Voltage regulator output too high

I'm trying to provide a 3.3V source for my micro controller from a 5V power supply, however seem to be having issues with all the 3.3V regulators I've tried. I'm currently trying to use an MT1117-3.3, ...
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1answer
42 views

Does replacing an audio device's AC adapter with a 9v battery require filtering?

I have two devices that use 'wall wart' adapters - an audio mixer and an audio headphone amplifier. Each is 120vac input and 9vdc output. I'm a technician so understand how to check for proper voltage,...
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1answer
52 views

1000Z in the power circuit, is it a Ferrite Bead?

is 1000Z a ferrite bead, and does it mean 1000Ω at 100MHz? OR something else? please help?
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78 views

Why would a LED torch chirr?

simulate this circuit – Schematic created using CircuitLab An old bicycle headlamp + battery pack. The batteries were 3.7V li-ion but broke down. I don't know how were they connected in the pack ...
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24 views

How should I model the DC power supply that powers the drain of an LDMOS RF power amplifier?

We would like to model a switching power supply for an LDMOS RF power amp so we can design the bias tee powering the drain to reflect as much RF as possible to keep RF out of the power supply. The ...