An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.

learn more… | top users | synonyms (2)

0
votes
1answer
9 views

Can't find 12V 10A DC jack panel mount connector for desktop power supply

I bought a 12VDC 10A desktop power supply and I got a power panel mount connector that can connect to desktop power supply plug. Desktop power supply: ...
0
votes
0answers
33 views

programmable AC voltage regulator

I have a testing setup where we have a manual voltage regulator that takes 230V AC input and outputs 50-230V AC. this goes then through a Power meter, then feeds a heating element. I use this to test ...
2
votes
3answers
153 views

White glue on circuit board?

Took apart an Apple TV due to no power from the smps and its like 80% covered in a white rubbery adhesive. I'm used to seeing this stuff (or similar) on bigger components like electrolytic caps to ...
0
votes
2answers
36 views

Transformer tolerances?

How much can a transformer go without a failure? For example, let's say that a transformer is designed to work with 500mA. (obviously you should avoid exceeding this limit) But as I learned with ...
1
vote
2answers
67 views

Arduino ESP8266: Connecting external power supply and USB from PC at the same time

I am using a ESP8266 esp-12e NodeMCU development board. The board has 1117 regulator to generate the 3.3V required by the module. It takes input from USB cable. When i connect the NodeMCU to my ...
0
votes
2answers
37 views

Is there a safe way to run a camera on a Lithium ion AND external power at the same time?

Similar, but not quite the same to this Question; "Charging and Using a Li-Po battery simultaneously", I want to have a battery in my camera but also connect an external charger at the same time. Is ...
-1
votes
0answers
54 views

High-current (20A) low-voltage (~4V) power supply question

I recently kicked my smoking habit with the help of an e-cigarette, or (shudder) "vape" as the cool kids call it. I've grown weary of constantly recharging batteries, so I thought I would build a ...
0
votes
0answers
43 views

Arduino I/O Shield relay won't switch [migrated]

I have an Arduino Uno and the I/O Shield wired up and I'm trying to switch (i.e. engage) a relay on the I/O Shield, but nothing seems to be working. I've identified the input pins correctly and am ...
7
votes
3answers
210 views

Why is the regulation of my 5 volt power supply so poor and how to address it?

I purchased a 5 volt power supply off Amazon. It runs from 120 VAC and produces DC power. It's a switch mode power supply. If I put a multimeter on the output it always shows approximately 5.0 VDC. I ...
-1
votes
2answers
78 views

How to determine the power needed for a device without knowing info about the device? [on hold]

I recently started a couple projects where I take apart old appliances and re-purpose the old parts. The problem I ran into was that I don't know how much power I need for some of the parts to run. ...
-2
votes
1answer
48 views

power supply input : AC 13V output : DC 5v, DC 9v,AC 8v

i am alredy to develop a schematic of power supply with Trasnfo 13V , 1,5A : so this my schematic and i want to voltage in U2 be continue and i need a solution and i am chagin now the schematic ...
1
vote
1answer
59 views

choosing a voltage regulator chip

I'm designing a schematic for a system that will utilize plug-in daughter boards. I'd like to provide the daughter boards with high quality 12V, 5V, 3.3V, and 1.2V, with up to 5A, available via pins ...
1
vote
2answers
62 views

Buck converter after 50Hz transformer

I plan on designing a variable power supply (1-50V, isolated), able to provide a power of about 50W. For efficiency's sake, linear regulation is out of the question. The natural thing would be to ...
-2
votes
1answer
62 views

Coil Gun Schematic [on hold]

I have a question. I have been looking at making a Coil gun lately and i had an idea for a simple one. Just need to know if it would work. Basically: Battery-->Switch-->Diode-->Transformer-->Coil For ...
0
votes
0answers
23 views

24VAC Power Pack Peak to Peak or RMS Voltage? (For Split Rail Power Supply)

I'm designing a regulated, current limited split rail power supply for \$\pm12VDC\$ and was thinking of achieving this with a 24VAC input plug pack/wall wart. I implemented the power supply with ...
0
votes
1answer
44 views

6 wire transformer

I have a transformer that is rather unusual. My issue is I have no Idea what wire does what. It is a 6 wire transformer. On one side we have one white and one back. On the other side we have one ...
-3
votes
0answers
26 views

How to design a circuit for a mini inverter for power backup of output 12v-0.5A [on hold]

I want to design a mini inverter with 12v-0.5A output for power backup,please tell me the details and give the circuit diagram.
1
vote
0answers
31 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 ...
-2
votes
1answer
59 views

How much power could a 5 x 3 cm turbine and a 5 x 5cm solar panel generate? [on hold]

I would like to make a project and generate a few power using a combination of a small wind wheel (let´s say 5 x 3 cm wheel) and a small 5 x 5 solar panel. I am not sure what the median wind speed is ...
-7
votes
0answers
41 views

Power supply with voltage and current selectors [closed]

Is it possible to create a power supply with voltage and current control through something like knob selectors? If there is, can I have a circuit diagram example?
-1
votes
1answer
39 views

Stepper motor driver board

Hi I'm planning to make a motor driving circuit on a perfboard. I'm new to electronics so please bear with me. In the past I've wired up stepper motors and run them correctly using microcontrollers. ...
1
vote
2answers
74 views

VREG output circuitry

I am making a PCB and I want the ability to have multiple power sources for it. One is a DC barrel jack and another is a transformer/rectifier. In the past I would use jumpers to allow one power ...
0
votes
1answer
47 views

DC Bus for Solar Charge Controller Battery

I am just learning the set up for a back up power. I am just wondering whether the DC output from the charge controller or the battery can be used for multiple loads. For example, I want to power my ...
2
votes
1answer
58 views

Capacitor rise/fall time varying with supply voltage

While testing the capacitor voltage fall times for my board at 3 different voltage levels I see that for 6V the fall time is higher than for 18V. I checked the same on a breadboard with a ...
1
vote
1answer
43 views

Multiple DC Voltage sources in parallel

I'm building an alarm system (paradox EVO192 with ZX8 extension modules) and was hoping to have separate sections of the system each powered by it's own battery backed up power supply (something like ...
0
votes
0answers
27 views

Switching power supply [duplicate]

I am currently working on a project of electronic being powered by DC power (7-40V) from car. The device is supposed to run properly (with several load of total 3-4A at 3.3V) when the car is turned on ...
0
votes
0answers
26 views

+24v to -24v/200mA Through hole inverter [closed]

I need a through hole switching inverter, which converts +24V DC to -24V DC and can provide 200mA of output current at least, all inverters that I found are a surface-mounting type and I need a ...
0
votes
3answers
39 views

Is dual power supply's ground coupled?

I am using a dual power supply model CPX200 from TTI in my school lab, and I am trying use it to supply 1.8V and 3.3V to a PCB, so I figured it was a good idea to check whether the ground of the dual ...
0
votes
0answers
41 views

Giant Capacitor in Power Supply Blew. Possible Cause? - Dell XPS 8700 [closed]

The giant capacitor in the middle of my Dell done gone blew up. As far as I know, capacitors blow from extended stress. Is that true? What is the function of this particular capacitor (its ...
4
votes
4answers
99 views

Hot and neutral have similar voltage to ground - finding the problem

I have an APC battery backup and surge protector for my computer. It has a light, labeled "Building wiring fault." This light is on, and my computer will not start. I am unemployed and my landlord is ...
1
vote
1answer
31 views

Turn on 12v car amplifier with ATX POWER_GOOD?

Does anyone know how to turn on a 12v subwoofer amplifier, using the ATX power supply control wire for POWER_GOOD? I am using an Azza model PSAZ-1000A14S, 1000 watt, single 12v rail, computer power ...
-3
votes
0answers
33 views

Checking voltage levels? [closed]

Whats the simplest way to check voltage levels? say I have a 1.5V power rail, I want to check that the power supply is providing 1.5V, if its not, do something predefined.
-1
votes
3answers
41 views

Can I power this device with a USB port? [closed]

I have an audio looping device known as the TC Electronic; Ditto Looper. It has its own dedicated AC/DC power adapter but I was wondering if I could possibly build a cable capable of powering it with ...
3
votes
1answer
47 views

Should I use MLCC or Tantalum capacitors near the board's power input?

My board consists of a microcontroller, some RF modules (i.e. bluetooth, wifi, etc), and a few other gadgets. It is powered by a 12V barrel adapter. I've read conflicting reports whether it's best ...
-1
votes
0answers
54 views

Power Bank doesn't supply 12v

I've bought a commercial power bank RAVPower RP-PB042 with a nominal output of 12v/1.2A in Quick Charge Mode. I'd like to this to supply an LED Strip but my output in quick charge is always 5V. Can ...
0
votes
1answer
47 views

Battery charger disconnection

In modern devices (mobile phones, tablets, laptops) the battery charging current is automatically switched off when the battery reaches 100 %. After being disconnected, the power supply cools down. It ...
1
vote
1answer
63 views

How to choose MLCC cap values for power supply decoupling?

I've read that it's best to use several MLCC caps with different values to filter out as much the varied frequency noise as possible. On the output of the voltage regulator, I see some noise in the ...
-1
votes
1answer
43 views

what kind of type resistor do I need in PTH05050W? [closed]

I found what I need to apply my xilinx virtex5 FPGA board, PTH05050W 6-A, 5-V INPUT NON-ISOLATED WIDE OUTPUT ADJUST POWER MODULE at www.ti.com. Maybe, this need to change by resistor to set output ...
1
vote
1answer
39 views

Use of decoupling/bypass capacitors for LED controller

My current circuit diagram The typical application schematic, Figure 17 (page 20), shows the usage of the 10uF and 0.1uF capacitors for the power circuitry. However Figure 16 (page 19), shows the ...
1
vote
1answer
134 views

What do the “F+” and “F-” pins on a power supply unit stand for?

I have a power supply unit I extracted from a media player and there is a pin connector with the labels "-24V", "GND", "F+", "F-". I know what the first two mean but what do the last "F+" "F-" mean? ...
0
votes
0answers
17 views

Arduino with wifi shield and 5AA batteries current draw [migrated]

Arduino uno with official Wifi Shield take 5 Volts. Arduino lights up as it should when powered but the WiFi shield is dead the l9 doesn't light up but works fine when arduino is connected to usb ...
0
votes
1answer
31 views

Power Management Unit: How to consider limit to connect electronic component to power rail

I am a bit confused about the way to dimension Power Management Unit, and power rail for electronic system. I understand quite well LDO and DC-DC in terms of voltage, but i don't understand well ...
0
votes
3answers
75 views

Are capacitors floating power supplies?

I'm struggling with the concept of floating voltages. For a grounded supply I can connect one side to an effectively infinite ground and get full power. It may vary depending on its construction, ...
1
vote
1answer
38 views

Battery charger with load sharing for portable Raspberry Pi 3

i'm doing portable Rasberry Pi 3 and i need help choosing the right battery power system requiered for the project. The project has: Raspberry Pi 3. Normal power consumtion around 700 mA with peaks ...
0
votes
2answers
57 views

How to supply power to INA128 amplifier

I'm trying to amplify an EMG signal from two electrodes with a INA128. However, I'm not sure how to connect the power supplies. I'm taking the 12V from the wall and using a voltage divider to get +6V ...
0
votes
0answers
23 views

Atx power supply typical load distribution

I'm designing a low voltage atx power supply. I need to know what load distribution is typical between the voltage levels of an average gaming pc. For example I know most of the power is used on on ...
4
votes
2answers
135 views

Power microcontroller from super capacitor

I have a uC that works with 1.8V up to 3.3V. Current consumption is at about 20uA in sleep mode and about 12 mA in active state. The uC will enter active state for about 100 ms every minute. So I am ...
0
votes
0answers
33 views

Aruino/laser driver setup

I am working on a project that involves powering an arduino zero and a laser driver. The driver we're using is the OELDC-800DIP. So let's say I use a 9V Duracell battery, the arduino's range is 7-12V, ...
1
vote
1answer
39 views

add LED indicator and fan to power supply

just a Grade 4 Filipino student asking for help. I'm kinda new to this and I'm not good at math.. Corrections and add-ons: 1. input is 220V AC 2. transformer is multi output(3v,4.5v,6v,9v,12v)(but ...
1
vote
1answer
60 views

Design of variable split rail power supply

I'm attempting to drive an array of piezo transducers and am struggling to find a good design capable of driving from around +-5V to +-30V at about 2A for my testing. There are about 12 sets of ...