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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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Power supply and PWM for brushed 24V DC motor

I've got a 24V motor with these carachteristics: -voltage: 24VDC - rated speed 2750rpm - Output: 200w Rated current: 10.9A I want to use it for a watchmater lathe, so I need to control the speed, ...
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1answer
50 views

Warnings about power supply in EAGLE

So I'm using EAGLE for the first time, and I have zero experience with any EDA software. I've completed a schematic and would like to proceed to design the board layout, but I am stalled by these ...
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1answer
85 views

Best way to convert 48VDC to 220VAC Pure Sine

I'm trying to convert 48VDC(input could be battery or not), to 220VAC(Sine) I've searched a lot and found different topologies so I'm not sure about which one to use. I'm expecting to have a 1600W ...
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1answer
40 views

Switching constant current power supply from a microcontroller

I am designing a constant current supply using Opamp LM324 & MOSFET IRFZ44N for driving LEDs. My challenge is to switch the supply to the opamp through a microcontroller. At present, I am ...
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1answer
21 views

RCC SMPS circuit modify

Its a classic ringing choke converter smps circuit found in chargers. This one yields 240ma @9v, need to modify to get 2A@5v, already have a 5v2A flyback dc dc transformer. Just need the changed ...
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1answer
31 views

Choosing battery for servo for arduino

I am using 4 REES52 S3303 Futuba Standard Servo Motor. I am going to use it with Arduino. How do I choose a power supply for powering 4 servo motors? Maximum voltage is 6V. They didn't mention ...
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1answer
101 views

Can I use a 150w 12v 775 DC motor with an old 800w PC PSU?

Is it possible to use a 150W 12V motor with a PC PSU? I know that it means that motor will draw a current of 12.5A from the PSU. The PSU can supply 20Amps in total on the +12V rail. As soon as ...
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1answer
43 views

Connect a switching power supply to the EU grid

I just bought a switching power supply which is supposed to be connected to the power grid using three connections (Neutral, Live and Ground). Unfortunately, all common cables can be plugged into ...
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2answers
34 views

current sink/source in ADS114S06B analog/digital converter

Here is the datasheet. It seems from the graphs on page 17 that the I/O pins will sink or source as much as 7.5 mA: However on page 9 the table indicates an expected sourcing of 1 mA (I say expected ...
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4answers
4k views

Why doesn't my computer USB port break when I plug in a 2A device?

For typical AC to DC power adapters, I understand that the device draws the current it needs from the adapter. If it pulls more than the adapter can supply, this can cause overheating and lead to ...
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3answers
83 views

Add constant DC voltage to a variable DC input

I'm designing a PCB and I need a voltage rail, roughly 3 volts above the main input (of 3 - 30V). This rail is to power some CMOS devices, so it won't need to supply much current. Currently I plan on ...
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1answer
44 views

Boost converter for High Output voltage and High Output current

I want to design a variable power supply. I need to get output voltage from 7.5 to 30 V and output current of 0-40 A. One of the above values will be fixed while the other changes. This is for ...
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1answer
48 views

Help understanding this schematic : Why is the diode there (AT89C2051 Programmer)?

I am having trouble understanding the following portion of schematic from AT89C2051 programmer circuit. Please help me comprehend what is going on here. Here is what I understand: A1 directly ...
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0answers
41 views

How to isolate batteries in series during charging by TP4056?

I have three 18650 batteries that i want to charge using TP4056 boards and provide a series voltage of 12V. This is for my prototype, which has limited space and the batteries are fixed. Therefore, ...
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2answers
1k views

How adding a jumper switches the power between 5V and 3.3V?

Below is a snapshot of MB102 bread board powersupply that can provide either \$5V\$ or \$3.3V\$ on either rails. We can switch between 5V and 3.3V by adding a jumper as shown. I'm just wondering how ...
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1answer
88 views

How can I boost 1 Volts 30 Ampere input to 5V with maximum Current limit of 5A?

How can I boost 1 Volt 30 Ampere DC input to 5V DC with a maximum Current limit of 5A?
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1answer
61 views

Voltage drop if power draw is too quick: Does it happen naturally or regulated?

If a laptop forced to drag out more current than the power supply can provide at the given voltage (i.e. 20 volts), the voltage does decrease, usually approximately anti-proportionally if I am correct....
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1answer
29 views

IEC 320 C8 wiring

I purchased this IEC 320 C8 AC socket switch for use in a power supply but I'm unable to find any sort of wiring diagram for it. Could someone please tell me which pin is which? It is not immediately ...
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1answer
45 views

Variable LDO implementation - capacitor size

I am designing two linear power supplies that will: Drop 9V DC to 5V DC to power a Raspberry Pi around 2.5A Drop 9V DC to 7.5V DC to power a DAC under 3A I plan to use Texas Instruments LDO UCC283-...
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0answers
47 views

Why are 65W and 90W common amongst laptop power supplies?

I have seen Dell 130W, Lenovo 120W, some 230W or 210W gaming laptops, etc. . These are different numbers. But I have seen both 65W and 90W power supplies from Lenovo (65W 20V 3,25A with rounded DC ...
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1answer
42 views

turning off an ATX-PSU

Converting an ATX PSU to a bench supply i found out how to start it by shorting the green wire to ground with a Push-button, and that I have to place a minimum load (preferably on the rail with ...
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2answers
48 views

Is 240V to 24V DC PSU to 120V 60Hz inverter a low cost way to convert 240V 50Hz to 120V 60Hz?

I've been looking at the companies providing step down frequency changing units in the 2000W range, and their enormous size seems to be reflected in an equally enormous price. SO...why can't I just ...
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0answers
74 views

ignition timing light trigger current

I've built an ignition timing light, following: http://citroen.tramontana.co.hu/en/ignition/stroboscopic-timing-light here the original schematic: I've changed some components: Instead of the ...
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26 views

TEC1-12706 power supply description [closed]

Can I use a 12V 2A power supply for 12 hours continuously, for a homemade refrigerator?
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2answers
508 views

Is it safe to make a dual supply out of two wall adapters?

I am trying to design a guitar distortion pedal circuit and I need +9 / -9 V dual supply in my application. I have two 9 V adapters: https://www.phihong.com/assets/pdf/PSM03A-XXX.pdf Would ...
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2answers
69 views

Has anyone else had issues using an LT1761 regulator?

I've designed a circuit and I needed to use low noise regulators. The regulator that I chose for my positive rail is the LT1761-5, the 5V fixed output version of the regulator. I put 6V in and I haven'...
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3answers
43 views

Voltage increase on regulator load

I have a simple adjustable power supply (1.8V - 16V / <1A) that I put together with an LM350, works great for the various small bench-top things I use it for. Typically on a load being applied, I ...
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0answers
33 views

Combine 2 power supply with a buck regulator [on hold]

I want to create a solar-wind energy combination for demonstration purpose for student, with criteria: be simple (no mppt, no complicated circuit), can combine 2 sources, can turn off 1 source using ...
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0answers
44 views

Atx Bench supply turns for less than a second [closed]

Hey im trying to make a lab bench power supply from a old ATX power supply i tested it before i disassembled it and it was working fine but now after i have it disassembled and solder the green wire ...
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1answer
55 views

Simple AC to DC converter: upper limit for the capacitance of filter capacitor?

By 'simple AC to DC converter' I mean the familiar circuit shown in the figure below, where the capacitor C reduces the ripple. A sufficiently large capacitor can be used in order to reduce the ...
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0answers
44 views

Control variable external power supply with Arduino

I'm currently working on an air pollution controller project and I have a problem to control an external power supply to supply 5V, 1.5V or 0V to an MQ7 gas sensor. Using the direct PWM output to ...
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1answer
50 views

Do I have to ground my laptop to use the Voltcraft DSO-2020USB Oscilloscope?

I have an Acer Aspire V5 laptop and I want to connect my Voltcraft DSO-2020USB Oscilloscope to it (as an interface). The power adapters model is PA-1650-89. I want to measure some 5V stuff - powered ...
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0answers
28 views

Magic Eye Tuning Tube Variable Negative Voltage

I am thinking about several applications of magic eye tuning tubes as display pieces and had a question about their operation. I have attached a sample circuit from a datasheet for an EM84 tube. I ...
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0answers
35 views

ESP32 Lolin D32 Pro wrong battery polarity [closed]

I have accidentally reversed LIPO 3.7v polarity of the battery and connected in to the Lolin d32 PRO module. The Magic Smoke :) went out and i quickly disconnected everything. After that I switched ...
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0answers
38 views

USB Charger is never connected to Ground [closed]

I have been troubleshooting issues with a device using a Micro USB charger. A Micro USB charging hub was used with multiple ports which created high amounts of noise. This was done simulate a noisy AC ...
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1answer
84 views

What happens when a LIPO drops under 3V? WeMos in DeepSleep doesn't start up again?

I have a Lipo (18650) which is charged by a solar panel (6V/6W + TP4056 charger). It's feeding a WeMos D1 Mini which is put in DeepSleep every 10 seconds. When it's awake, it sends something to ...
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1answer
35 views

Non-isolated DC power distribution for an appliance

I am building an appliance where we have a device where we need to have a +48 V/300 W DC power rail and a +24 V/300 W DC power rail. The AC (mains) should be world-compatible (both low- and high- ...
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1answer
44 views

USB type-c power supply (up to 20V 5A) from DC source

I have a custom made 5s power bank (30 x 18650 cells) and I want to make a power supply to charge my laptop using this power bank. It's not a big deal to make a 5V charger because I just have to hard ...
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1answer
42 views

What kind of PMIC is this?

I found this circuit in a schematic I'm reviewing, which supposedly provides a regulated +5 V supply. The primary side of the transformer includes a flyback controller that switches ~340 VDC on the ...
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4answers
3k views

What is the maximum voltage that silicon can handle?

Today, in a race for efficiency, we have moved from transformers to switching power supplies. Almost all PSUs were designed for single-phase low-voltage operation (220Vac/310Vdc in my country). I've ...
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2answers
55 views

Any downside to feeding a buck regulator into a linear one?

I need to convert 12v down to 5v and 3.3v, I am using linear regulators right now but they get pretty warm and eventually I would like to supply more current for it (around 500ma-700ma). If I used a ...
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1answer
107 views

PCB power supply layout considerations

I'm designing a circuit that steps down 230v AC to 12v DC and then uses an MCP73213 IC to charge a 7.4v li-po battery. There is also functionality to switch over to the battery supply if there is no ...
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0answers
45 views

Buzzing from chime-box power supply

I have recently purchased a home, and discovered there is a god-awful buzzing sound. It does sound like a 60Hz buzz. I tracked the buzzing to this (see photo)-- which I think is for the doorbell. I ...
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0answers
38 views

Charge car battery with lab bench power supply

Is it possible to charge a lead acid car battery with a lab bench power supply? I am thinking of hooking it up to 13.8 Volts and 1 Amps. Will this work?
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5answers
107 views

Is a 2 Ampere power supply dangerous? [duplicate]

I'm sorry if this question seems extremly dumb or/and pathetic. I'm quite new to electronics. For one of my electronics projects, I want to buy a power supply like this one, but it says Output: 12V 2A ...
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1answer
29 views

Using a replacement AC-AC adapter that has a lower current specification

There are many similar questions for AC-DC adapters but couldn't find an answer for the AC-AC adapters, I apologize if it has been already replied but I have missed it. I have bought an old headphone ...
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0answers
63 views

What is the purpose of feed wire and return wire in electric railway?

Looking at the following image: Image source: The Railway Technical Website On the left of the mast there are two cables, feed wire and return wire. Are they acting like a ground cable which ...
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2answers
108 views

Inductive load shorts power supply

I had a hair-brained idea the other day and put together the attached circuit. The problem: the instant I push the switch to place a voltage across the inductor, the power supply shuts down. Clearly ...
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0answers
25 views

Peltier refrigerator module [duplicate]

In tec1-12706 module power supply given 12v 6 amps..but i connect at 12 v 4 amps and 12 v 3 amps transformer paralleley..but cooling is insufficient.. please find the problem.. anyone help to find the ...
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1answer
65 views

Dell power adapter does not get warm? [closed]

Usually I notice that power adapters get warm whether they are being used to power a device or not. The rectangular Dell computer power adapters, however, do not seem to get warm unless they are ...