An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.
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20 views
i am trying to match a power supply to a computer but cannot get the exact volts /amps/ power in a standard psu [duplicate]
As I said above, i cannot get an exact match for the computer I am trying to repair. Which is 12v @ 6.7 amps approx 80 watts. The closest I can get is a 14v -17v unit. is this higher voltage likely ...
3
votes
1answer
104 views
Safely extract power from USB
I am upgrading the lighting in a model with simple circuit which has 17 LEDs (approximately) plus one or two 555 timers. Presently, everything is powered by 3 AAA batteries. It drains between 150 and ...
5
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2answers
167 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: ...
3
votes
1answer
97 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 ...
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2answers
105 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 ...
3
votes
2answers
12k views
How to use external power supply for Arduino Uno?
Can I use an AC power adapter that can be connected through USB port? My board is Arduino Uno and usually connect to my computer through the USB cable.
AC power adapter <-> USB port <-(USB ...
5
votes
4answers
194 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 ...
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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 ...
2
votes
1answer
2k views
Connecting multiple ultrasonic sensors to one Arduino
I'm trying to connect five ultrasonic sensors (HC-SR04, to be exact) to an Arduino board to detect obstacles in five directions (four cardinal + one Z-axis). I read the datasheet on the HC-SR04s and ...
16
votes
4answers
4k views
What's the purpose of two capacitors in parallel?
What's the purpose of the two capacitors in parallel on each side of the regulator in
this power supply circuit
I've seen similar setups in other similar circuits and can guess that it's related ...
6
votes
1answer
418 views
Driving LM3886 at 100 KHZ in Bridge Tied Load (BTL) configuration?
Would someone have experience with driving a pair of LM3886 Overture Power Amplifiers in BTL with up to 100 KHz sine wave?
My parameters:
Frequency band of interest: 20KHz to 100 KHz, sine wave
...
1
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2answers
440 views
Common ground between battery and AC/DC adapter
Is it possible to connect an AC/DC power adapter's ground (-) to a battery's negative side?
I am powering a car radio with a 12V AC adapter. That works fine. However, if the radio loses power, it ...
5
votes
2answers
156 views
Pulse generator and source supply connection
I need a signal that most of the time will work as a power supply for the microcontroller but at some external event a positive pulse will be generated and added to the normal power supply. Power ...
2
votes
2answers
722 views
Is there any difference between “induction” and “resonant” wireless energy transfer?
This article compares two systems for wireless energy transfer - one is by WiTricity and another is Bombardier PRIMOVE. I've read their descriptions thoroughly - to me they both look like resonant ...
2
votes
3answers
167 views
AC Adaptor converted in USB charger, is it safe?
Is it safe, or maybe I should I say "logical", to take an AC adaptor and splice the wires, reconnect them and solder together with a USB cable to power a device?
I had an old gameboy advance sp ...
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0answers
60 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
59 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 ...
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0answers
102 views
Under what circumstance will damage a lab power supply?
I used a ISO-Tech IPS2303D DC Power Supply to test a solar power charging circuit based on BQ24650. There is a LRC circuit with 10uH inductor on it.
Long story short, I use the power supply to ...
2
votes
1answer
91 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 ...
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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?
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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 ...
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1answer
947 views
Do I power a stepper motor with 24V and Arduino?
I am building a motorized barn door tracker using an Arduino UNO and a stepper motor I took from an old scanner (Mitsumi M35SP-7T). I have been unable to find the datasheet for this motor ...
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 ...
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0answers
48 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 ...
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0answers
28 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
2
votes
4answers
114 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 ...
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 ...
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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?
8
votes
3answers
2k views
OpAmps - Single Supply or Dual?
I'm trying to pick an op-amp and I'm having trouble figuring out if the op-amp needs a positive and a negative power supply or if I can connect it to ground and the positive supply.
What do I need to ...
2
votes
4answers
79 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 ...
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votes
1answer
313 views
Switched bleeder resistor on a capacitive power supply
I posted a more vague version of this question a few days ago here and this question was linked as being similar. Answers in both threads were extremely helpful and were along the lines I was ...
3
votes
2answers
68 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 ...
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2answers
134 views
Where to get 12V from my computer?
Since I am having some trouble with a battery pack and a charger I want to use for a home robotics project I got a tip to just use some alternative power source and buy a new battery and charger once ...
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0answers
45 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 ...
1
vote
1answer
163 views
Why sine wave UPS triggering surge protector again and again
I recently open up brother's APC sine wave UPS to fix and trying to repair some damage that usually happen over time due to age by replacing components I suspect one by one.
When I start doing AC ...
4
votes
2answers
103 views
How to properly snub transient spikes from a transformer and prevent switch mode power supply burn out
I've received a failed switch-mode DC-DC step down converter (part# LTC3631 from Linear). This circuit was driven by a 24VAC transformer which is rectified on the circuit:
simulate this ...
3
votes
4answers
150 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
103 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 ...
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0answers
55 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 ...
4
votes
4answers
1k views
How do I improve efficiency of a boost converter?
I have built a 3V to 5V boost converter with discrete components.
L = 220uH
Vf(Diode) = 0.25V
ZVN4210A MOSFET
C = 470uF
f = 47KHz
My load is a microcontroller board (M16C QSK62P Plus) that takes ...
19
votes
3answers
3k views
Can I replace all electrolytic capacitors with ceramic ones?
I am designing the power supply circuit for a system that needs several supplies, my questions are:
Is it possible to replace all electrolytic caps (Mostly 100uF) by ceramic ones? What are the ...
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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
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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.
5
votes
2answers
280 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 ...
6
votes
3answers
320 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 ...
3
votes
2answers
120 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 ...
2
votes
1answer
96 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 ...
0
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1answer
105 views
Alternatives to the PS223 power supply monitoring IC
I am repairing a power supply that (among other faults) has a dead PS223 chip. This chip monitors the output voltages for over/under voltage and over current. It also outputs a "power good" signal to ...
