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
36 views

AC->DC Power supply ground and probing

I'm learning electronics and I have an old C64 power supply which was made at our local electrical shop back in the 80s. I'm taking a look at it to try and understand how it works. What I don't ...
0
votes
0answers
24 views

Can a joule thief circuit be made to both boost or buck an input voltage?

In the normal run of things I would use a 555 or something similar to generate a PWM signal as the base for my power supply. The caveat is that for my application I need continuous operation from an ...
0
votes
0answers
34 views

Single or dual ground plane for SMPS DC-DC converter?

I'm working on DC-DC converter prototype using dual layer PCB. Layout it finished using bottom layer as ground plane. Question is does make any sense to put on top layer also ground. How that can ...
0
votes
0answers
22 views

Switching Power Supply Not Working TI TPS54331

Let me preface this by saying this is my first switching power supply design. With that said I used TI's online tool to auto generate the schematic / values of the resistors, caps etc.. What could ...
0
votes
1answer
104 views

Is a 1.8v supply too low for driving a long bus?

I'm designing a circuit comprised of two boards separated 23 inches away and connected through a ribbon cable which carries an I2C bus (400Khz) and various interrupt digital signals, plus VCC and GND. ...
0
votes
2answers
33 views

Powering LED Strips with a Constant Voltage Supply and Constant Current Driver

I have a LED strip (16ft Hitlights Luma5 warm-white high-density) powered by a constant voltage supply. I'm considering adding PWM dimming with a Maxim MAX16820 constant current driver. The PWM signal ...
0
votes
3answers
53 views

What are ways to make a dual voltage supply from a single DC supply and output around 300mA?

I am trying to avoid using two separate +12V power supplies to power an op amp and instead I just want to use one. The current from the rails to the op amp is approximately 300mA per rail and the ...
0
votes
1answer
77 views

Simple Power Line Communication

I'm working on a remote (wirless) door opener and I need to install a device (just in the opener) at the entrance of a building where there is an electric opener. The problem is i can not install ...
0
votes
2answers
65 views

small power adapter for powering 3 leds

I want to put 3 leds as night light to some power outlets around the house. I also want to keep them discrete so the power adapter (110v to 5v) has to be small. I don't want to use a simple resistor ...
0
votes
0answers
35 views

Automatic Battery Charger Circuit. Not getting proper output

i have tried to make a circuit from electronics hub. but the LEDs in the circuit is not glowing. But the circuit is ok charging is doing well. Any problem with this circuit ? please help ?
0
votes
3answers
107 views

Coiled Nichrome wire 220 volt

I want build a furnace using firebricks and coiled nichrome wire. The dimensions of the furnace are 1×1×1 m. I need temperature inside the furnace to be 650°c. I have 220 VAC mains. ...
1
vote
1answer
116 views

How to Generate Light in the 10,000K Spectrum?

I need to generate a lot of light with the same spectrum as the sun - 10,000 Kelvin (10000K). I have searched around for hours, however all full spectrum lights available are either 5500K or 6500K - ...
0
votes
0answers
61 views

AC electronic load (current sink) (Automatic test equipment for DC/AC)

I am contracting a automatic test equipment for DC/AC converter (24V-5A to 50V/2A). The core of the tester is the electronic load. The electronic load is a constant current sink as the circuit here. ...
11
votes
4answers
2k views

Is current flowing backwards a bad thing?

In the circuit below: I find it awkward that the direction of the current on the 2V power supply is running opposite to the direction of the current on the 5V power supply. In the 5V power supply ...
0
votes
1answer
59 views

Measuring Output Amps From a Power Supply

I am in the quest to build a cheap bench power supply, i have successfully designed, built and tested the entire voltage circuitry. The device includes a graphic LCD screen that displays the voltage ...
0
votes
0answers
25 views

Use of hpcompac desktop computer internal speaker for mobile phone audio output [closed]

My hpcompac desktop computer is dead but internal speaker is working I want to use this speaker to listen songs on my mobile phone, any suggestions?
1
vote
0answers
28 views

Switching between power supplies with supply dominance selection

Following an earlier question Switching between power supplies - USB dominant After doing some more research with the given answers and after seeing switch between battery and usb power no ...
1
vote
2answers
106 views

What do you call a transformer separated from a wall plug?

I got a hold of (from a friend) a AC->DC 5v 2a power transformer - it connects to the wall with lamp cord/ figure-8 connector, and has a USB plug on the other side. I can't for the life of me find ...
2
votes
3answers
584 views

Are normally open contactors virtually safe from failing closed?

Quick question: are normally-open contactors (which I assume are simply high breaking capacity relays) virtually safe from failing closed? I want to cut off a 400V 3-phase supply using an emergency ...
3
votes
2answers
492 views

How long will a battery last based on these numbers

Hi I asked this question on SU but seemed to have gotten into a bit of trouble, I was referenced here. I am getting into doing hardware build based on things like microcontrollers and ...
0
votes
0answers
23 views

Power feeder current and LTSpice simulation

I'm trying to develop a power feeder as already state in question Power feeder scheme adaptation. I have done some adjustments, now my circuit is The voltage regulator is an LM317. Since I have to ...
0
votes
1answer
42 views

Voltage regulator VS power supply

I made a circuit with some components (arduino, wifi board, ultrasonic sensor, sound sensor, light sensor, temperature sensor, humidity sensor, some leds and other components) on a breadboard. The ...
0
votes
0answers
25 views

LTSpice load simulation [closed]

I have to check using LTSpice if my power feeder is able to provide an amount of current. How can I simulate a load in order to check this? thanks
1
vote
1answer
47 views

Can a CM choke be used to suppress common mode current in a DC circuit?

I have a setup with a DC/DC converter like in the figure below. I need to minimize common mode current on the supply input. There are no other connections besides Vsupply + and - and Rload + and -. ...
1
vote
1answer
60 views

Power feeder scheme adaptation

I'm trying to change the voltage regulation circuit in order to obtain a different range of voltage. My feeder uses a diode bridge and a transformer, that are not displayed in the scheme(it works). ...
0
votes
1answer
49 views

IRF540 power Mosfet 12 volt motor gate resistance

I have a IRF540 power Mosfet driving a 12 volt motor. Currently I am using a 100 ohm gate input resistor, It is working fine. What I want is the maximum gate resistor value that I can use and still ...
0
votes
3answers
108 views

MOSFET not fully OFF when Gate Voltage is 0V

A N-channel MOSFET STP16NF06L is used to drive a 12V load. Pin 1 is connected to Arduino Uno digital pin 4. Pin 2 is connected to the negative terminal of the 12V load. Pin 3 is connected to the ...
0
votes
0answers
28 views

Arduino Uno/Multiple Servos - Single Power Source

With full disclosure, I am a noob at this, so please be gentle as I have researched this across multiple boards and am frankly confused by the answers: Short Version: I have built an Iron Man Suit ...
0
votes
1answer
42 views

How can I debug the amplifier section of tuxgraphic's powersupply?

I've built this circuit: http://www.tuxgraphics.org/common/images2/article379/powersupply.gif Here is a closeup of the amplifier section which I've built: simulate this circuit – ...
-3
votes
0answers
23 views

On 3 phase 30A 420V AC circuit, superimposed wave [closed]

On 3 phase 30A 420V AC circuit, is it possible to superimpose 6000 V 0.001A variable HF wave? How can this be achieved and who can configure this requirement.
0
votes
1answer
137 views

Dangerous Power Supply [closed]

I recently bought a 3D printer from the USA and imported it to the UK, it came with a Chinese 12v DC 30 Amp power regulator. The PSU is a metal enclosed box. It can take 220 Volts +/-15% so it should ...
0
votes
3answers
29 views

Connections for Panel Mount 12VDC Power Supply

I'm using a 12V Panel Mount Power Supply, taking a 110/220VAC input and giving a 12V/5V DC output. What is the best practice for connecting this power supply to the AC mains? And how should this ...
0
votes
0answers
31 views

Modded 360 PSU outputting 16 volts, need 12 volts, what resistor do I need? [duplicate]

I have modded an Xbox 360 power supply socket to connect to my Pico PSU like so: I should note that the brown wire (positive) isnt making contact with the top pin, thats just the angle of the photo. ...
1
vote
2answers
63 views

Switching between power supplies - USB dominant

I'm trying to create a data logger. I want the data logger to be able to run in 2 modes. Bench mode (usb powered 5V) Field mode (externally powered 3.3 - 12V) Bench mode is active whenever power ...
1
vote
1answer
80 views

using double powersupplies

I have 2 computers (home PC's). Both are connected to the internet through a router/switch. The router is always powered, regardless when one (or both PC's) are going standby. Idea is, to power the ...
-3
votes
1answer
74 views

How to modify this schematic for more amps? [closed]

How can this schematic be altered for more amps and to match my transformer? The transformer I am using outputs 21-0-21 volts ,4amps.
0
votes
0answers
31 views

3 phase power supply design

I want to build 3-phase power supply, which has following specification: 4 terminal for voltage(R,G,B,N) variable voltage(0-300V) on each R,G,B. 6 terminal for current.(2 each for R,G,B) variable ...
0
votes
0answers
35 views

Expandable power supply for multiple components with different power requirements

Suppose an Arduino based project involves multiple sensors and actuators, each with its own power requirements, what are the ways to build single power supply for it ? Further is it possible to make ...
2
votes
1answer
53 views

volt management for a big circuits (mother board if you will)

I've to have a 2 Ardunio and 1 Netduino in a board, they are connected to +100 component. All I need is less than 5A so I bought a 12v 6A power supply and need to ask some questions so I avoid doing ...
0
votes
1answer
26 views

dual vs single rail speaker excrusion

Is there a difference in speaker total excrusion if i using single and dual? Like if single it's just excrused from 0mm to like says, 5mm. and if it was dual rail i'll go from -5mm to 5mm? If yes ...
1
vote
1answer
84 views

Powering 100W amplifier with 12V rails from ATX power supply

I've got some old speakers that I'm planning to power using this 2x50W amplifier(link)(I'm open to suggestions of a better quality to price amp). To power the amp I was thinking of using an old ATX ...
0
votes
0answers
43 views

Noise with a MPS-200 power supply

I am testing a 24V medical power supply (Mean Well MPS-200-24) for one of ours future products. The power supply is mounted on a metal chassis connected to the ground. The following schematic shows ...
0
votes
1answer
39 views

PWM Control of Hotwire Power Supply

I'm building a hot wire setup to do various hobby projects. I've got most of it figured out already, thanks to the wealth of information there is out there. I have a 12V switching power supply with a ...
0
votes
1answer
91 views

Reduce power supply voltage

I'm trying to build the power supply described here. R1: 1K8 1/4W Resistor C1,C2: 4700µF 25V Electrolytic Capacitors D1: Diode bridge 100 to 400V, 1.5 to 4A D2: LED Any type ...
0
votes
2answers
43 views

User power supply current limit to avoid current limiting resistors for LED

everyone! I would like to know if I can avoid to use current limiting resistors by pushing my power supply to its limits (it already sounds not like a good idea... btw...). Say I have a 3.3V power ...
0
votes
2answers
57 views

Constant Current vs Constant Voltage Dimmable LED Drivers

For my circuit, I want to use 110VAC mains power, via a TRIAC dimmer to an LED Driver power supply. For this use case, I am confused on whether to use a constant voltage AC to DC LED driver power ...
2
votes
1answer
44 views

AP5002 step-down switching regulator loop stability

Problem, parameters I have an 5V output power supply, with 2S LiPo input (6-8.4V), implemented with AP5002 (PWM control 2A step-down switching regulator, docsheet), and for the life of me, I can't ...
0
votes
0answers
22 views

Tinkering question regarding a voltage regulator to control the amount of ozone generated

Tinkering on a little project in my utility/water heater room to control litter box odors. Picked up this little guy (http://amzn.com/B00FPFPAKU) off amazon for $25. Initially, I wanted to put this ...
2
votes
1answer
102 views

Ripple in my power supply

I am using a bridge rectifier power supply with a 7805 regulator IC for a microcontroller application. A capacitor (2200uF) is used for removing additional ripple. But when the microcontroller uses ...
0
votes
0answers
29 views

What's the typical harmonic distortion on the secondary side of a distribution substation?

What's the typical harmonic distortion and waveform found at the low-voltage side of an urban substation (I.e: the aggregate of appliances and secondary distribution system impedance)?. If you can ...