An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.
2
votes
1answer
82 views
Are these pcb layouts good?
I'm working on an USB audio interface; the board has an analog section, with amplifiers and filters for the input and the output signals, a digital section, with the DAC, ADC, and the microcontroller ...
-2
votes
0answers
35 views
How to design a filtered power supply? [closed]
The filtered power supply that must be design can produce dc output voltages of +10V (+-) 10% and -10V (+-) 10% with a maximum load current of 50mA. The voltages are to be switch selectable across one ...
5
votes
4answers
183 views
What's an easy way to supply power to a breadboard without using batteries?
There are a number of kits available (for example sparkfun's Breadboard Power Supply USB - 5V/3.3V and Breadboard Power Supply 5V/3.3V or Adafruit's Adjustable breadboard power supply kit - v1.0) but ...
-1
votes
2answers
98 views
Power Supply Control Circuit
I have to build the circuit shown below as a homework, it is a power supply with frequent energy switching; but the schematic is incomplete... I should add another circuit which controls the voltage ...
5
votes
2answers
161 views
Power Supply Design - Multiple Voltage Regulators
I'm trying design a benchtop DC power supply for powering small projects, breadboards, arduino, etc. This is a list of what I want from it:
Fixed voltage rails for 24V, 12V, 9V, 5V & 3.3V
Edit: ...
0
votes
0answers
59 views
Combining 2 sources of ac to provide more power?
I have a device that takes 24VAC.
I have two adapters that takes 120VAC and converts to 24VAC.
One adapter works with the device, but I get instabilities from time to time and I wonder if it ...
1
vote
1answer
55 views
Wiring a switch to toggle both usb power and external power on Arduino
I have a 5v Arduino Pro Micro. I am using it to run a series of motors. I am controlling it through the USB port. The USB power doesn't supply enough current to power the motors, so I am using a 9v ...
2
votes
1answer
85 views
Multiplexing large LED matrix
I have a project which involves building a 64 x 48 (3072) LED matrix driven by a Raspberry PI computer. I am a first-year computer engineering student so I am still inexperienced with shift registers ...
-3
votes
0answers
48 views
Testing the problems with earthing at home [closed]
How can I test the current leakage problem of Home due to faulty earthing? Switching all the electric devices and checking out the meter to see whether its running - will that do?
0
votes
0answers
43 views
Computer only boots after connecting PSU PSON connection to motherboard PWRSW + ground [migrated]
My server ( ASUS M3N78-EMH HDMI ) would not come back up after I put swapped some RAM. I got it back to work eventually but there is something strange: after a complete power off (pulling the ...
2
votes
1answer
50 views
0V Adjustable LDO Adjustable Regulator
I'm currently researching LDO adjustable regulators to make an adjustable supply that runs from 5V. I want my supply to be capable of supplying down to 0V.
I've found the LT3083, which can adjust ...
0
votes
0answers
47 views
adjustable battery indicator
I've got a simple circuit powered by one 18650 LIon battery.
Now i want to light up a LED when the battery voltage drops under a specified value (e.g. 3,4V)
I know it would be easy with a ...
0
votes
0answers
27 views
Can I wire a PicoPSU with PCI-E in series to a SMPS?
It would look like this:
The SMPS model is Mean Well EPP-300-12. It's rated for 300W at 12V/25A
3
votes
1answer
74 views
Possible measures to make power supplies safe
I'm looking for a list of ways that mains-powered ELV power supplies with touchable terminals can be made safe in the case of transformer failure with primary and secondary coils becoming connected ...
2
votes
4answers
113 views
Voltage Converter's GND Problem
I am confused about the ground part of a voltage converter.
This is a typical voltage converter. As you can see the the main voltage is 230V, and the output is 5V. Look at the output 0V, which is ...
1
vote
1answer
102 views
Oscilloscope ground clips sparks while connecting to power supply
Oscilloscope ground clips sparks while connecting to power supply ground. I do understand The clip is connected to earth ground. But why does it not spark when I am powering a circuit of the supply?
2
votes
4answers
78 views
Use old PC power supply for 24v solenoids?
I'd like to use the +12 and -12 leads from an old PC power supply to power 24v irrigation solenoid valves. The values are rated 0.22A inrush current and 0.1A holding current.
I only plan on 1 or 2 ...
3
votes
2answers
67 views
Getting rid of ripple from an LCD backlight
I have built a circuit which contains an integrated power supply stepping down mains voltage to 5v through a transformer, rectifier circuit and a voltage regulator. With a couple of smoothing caps the ...
-1
votes
0answers
43 views
Attempting to determine the amount of power a motherboard can handle through the PCI-e slots when using 4+ GPUs [closed]
I am trying to discover the best method of determining the amount of power multiple PCI-e cards use in relation to how much power the motherboard can handle. Also, I need to know what alternatives for ...
-2
votes
1answer
98 views
Why UPS for sensitive SMD development?
My friend suggests me UPS for SMD development. I already have a a surge protector over all devices. He recommended the UPS that transmit all energy through its battery and he recommend to find some ...
3
votes
4answers
147 views
Voltage regulator too hot to touch [duplicate]
I'm working on an RGB LED project. I'm using this as the power supply: https://www.sparkfun.com/products/114
It uses an LM317 which according to the data sheet can supply up to 1.5A. The LED's I'm ...
5
votes
3answers
102 views
Voltage supply clipping to <=3.3V
So, I have this circuit which needs <50mA and can be supplied with a voltage between 2V and 3.3V.
I want to supply it with a Li-Ion cell, which has 2.7-4.2V. I don't really want/need the ...
0
votes
0answers
53 views
Recombining split phase US 240VAC to get normal 240VAC
When measuring voltage on a US residential 240VAC circuit a meter will not show any voltage flowing across the two hot wires. Reason being is this is two 120 volt hot wires that come from a center ...
3
votes
1answer
90 views
Harsh Enviroment MCU Power Supply
Elec Eng student here, I've joined a project at my university's mechanical eng department who are building a rather large hybrid rocket. Unfortunately they've been having issues with the ...
-2
votes
0answers
26 views
Transformer Power Factor [closed]
I have a 24 VA 220/24 Vac transformer connected to a full bridge rectifier.The load connected to the transformer rectifier unit are electronic counters and digital displays. I need to calculate the ...
-7
votes
0answers
35 views
How to increase attracting force of a solenoid.? [closed]
Plz help me in making my Magnetic Glove. I require a suitable power source to increase the attracting force of my solenoid.
6
votes
3answers
311 views
Why can't a power supply supply low current?
I've just read this article and don't quite understand how a power supply can't supply such a low current. I was always under the impression a power supply could supply anything up to its rating, but ...
2
votes
1answer
93 views
How to build “two power sources” in a microcontroller circuit?
My circuit has a microcontroller, it uses power from a DC transformer (120V to 12V DC). My circuit also control an pneumatic valve which also use 12V DC. Almost every time when the pneumatic valve ...
-4
votes
1answer
46 views
LED power supply reverse connected? [closed]
i have my 100 w - 220v AC to 12v DC LED power supply , and i connected the 220v AC line to the +VDC and the 220v AC Neutral to -VDC,
i know i seem to be a dump for you. but i hope if someone can help ...
5
votes
2answers
279 views
Can you send data usefully over one wire, literally one wire?
It is possible to design networking systems that only use two wires: one for data and one for a common ground. Examples include 1-wire and Pin&Play. These are called single wire systems because ...
4
votes
3answers
147 views
Driving Permanent Magnet DC Motor via PWM
SUMMARY:
I am currently trying to finish up a DIY project I've been working on for a while: Building an electric potters wheel. I acquired a treadmill and salvaged quite a few good parts from it, and ...
-4
votes
0answers
41 views
How can you hook up a Motorola power circuit to another motherboard? [closed]
I have a Motorola razr v, power circuits. I wanted to know, how can you hook up a Motorola power circuit to another motherboard. So it can power and charge the motherboard. How can this be done?
0
votes
2answers
66 views
What is the basic principle for a cmos vcc detector circuit?
Most systems that have any controller/firmware need to know when to start powering up. I would imagine this might need a powerup circuit or a detector that trips when we are at an acceptable voltage. ...
3
votes
2answers
119 views
Converting universal AC to 3.3v DC @ 0.1A
There's a bunch of topics around this but i haven't found something that fits my requirements. I'd imagine this is a fairly common thing though so any pointers would be appreciated
Basically i want ...
3
votes
2answers
170 views
Do I have pseudo three-phase power at home?
I get three live wires and one neutral from the mains. Different rooms in the house are connected to different circuits which terminate at a changeover panel. The changeover switches allow each ...
1
vote
2answers
92 views
Solar power wattage requirement
I want to understand the Math behind the Solar Power Panel Wattage requirement in order to charge 10 mobile phones (use 0.8A each) at the same time. No battery is required. Solar panel output is 12V ...
1
vote
0answers
58 views
Has anyone seen power cycle corruption in industrial SD cards?
I am using a micro SD card in a new embedded Linux system (choice of SD was not mine, was made by the hardware guys). I have seen a problem before where power cycling of a system without doing a ...
1
vote
1answer
73 views
Arduino motor shield running 2 12V 60 RPM DC motor
I'm trying to run a bot with a differential drive system and I'm using 2 12V 60RPM DC Motor and an Arduino shield along with the Arduino, along with that I'm also having an wheel position encoder ...
-5
votes
0answers
61 views
Home made voltage source [closed]
What is a simple schematic of home made voltage source? It should be able to provide a range of voltage from 5V-9V, and enough current and low internal resistor.
0
votes
1answer
36 views
Dev Platform to talk to PMBus/SMBus/I²C Power Supplies
I am looking for a simple way to talk to PMBus power supplies (ie. get current information, turn power supply on or off, etc). This is normally integrated on computer main boards or server main ...
-1
votes
2answers
101 views
Multiple 2A USB Mains powered chargers [closed]
I'd like to know why there are no mains-powered chargers that can charge multiple usb devices at, say, 2A and 1A?
I'm after something that can charge 2 tablets that ask for 2A and 2 phones on 1A, so ...
0
votes
1answer
86 views
Is it possible to increase voltage from a power supply without incuring great current lose
I have a 24V 4.5 amp(108 Watt) power supply. I know most Voltage regulators take a higher voltage and regulate it to a lower voltage.
Is there a way to increase the voltage of the 24V 4.5 amp(108) ...
-3
votes
1answer
77 views
How do I measure ripple current in a battery charger? [closed]
Minimizing ripple voltage is major factor to avoid failure of equipment such as digital axle counters. (Eldyne)
How do I measure ripple voltage in a battery charger with a 230 VAC input and a 24 VDC ...
-3
votes
0answers
44 views
Error in implementing particle swarm optimization in power system using MATLAB [closed]
I'm trying to get the solution of economic load despatch using particle swarm optimization. I've written the code but during updating the velocity and particle position in the second iteration, it ...
0
votes
0answers
53 views
LED display has noise
I am developing a LED display driver. It uses a PIC18F452 microcontroller and a 74hc245 IC.
It uses the SPI protocol to send signals to the LED display. When there are small number of LEDs switched ...
7
votes
2answers
388 views
How can I spin an old HDD motor?
I've stripped out an old IDE (40 Pin) HDD from 1998 for use in a POV display project (Gr. 12 Computer Engineering), and I've been trying to spin it up.
The problem is that the HDD motor is brushless ...
3
votes
3answers
152 views
Building a power supply, want to stay alive
I am building a power supply for a very old laptop. The circuit uses a transformer (220 V primary to 15 V secondary, 33 VA) and that worries me a little. (Please note that I an enthusiast and so far I ...
0
votes
4answers
164 views
3.7V Lithium ion battery supply and Arduino Uno
So many people have asked questions related to mine already, but mine is not quite out there. So my question is I have a 3.7V Lithium Ion battery and I need to power Arduino Uno, which requires a ...
2
votes
2answers
137 views
how do they make travel adapters so small?
How do they make cellphone adapters, especially "travel adapters", so small?
I once peeked inside an old Nintendo adapter, and it had (among other circuitry) a rather-bulky step-down transformer to ...
5
votes
4answers
193 views
Can electronics be damaged by undervolting it?
I was wondering if there are some particularly important mechanism by which one can break electronics, when undervolting it. Its pretty obvious that lots of electronics will not work properly if ...
