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
20 views

Feeding arduino with ATX standby power

I'm designing an Arduino shield to allow the Arduino to control, among other things, an ATX power supply -- I'm running GPIO pins to the PS_ON and P_OK pins of the ATX. I would like to be able to run ...
-2
votes
1answer
45 views

ATX PSU to variable voltage and current supply (LM317?)

Yesterday someone drove by my house and dropped an old pc next to my house. I took it inside and inside of it I found some cool stuff. 2 1gb sticks of ddr ram, radeon hd3850 that I couldn't test ...
0
votes
2answers
25 views

How is the resistor value for boost conversion calculated?

I'm looking at MCP1640 and in Section 5.2, an equation for calculating RTOP is presented. However, the two examples underneath have RBOT = 309kOhm. How did that come about? Is 309kOhm some standard ...
0
votes
0answers
33 views

How to shield an isolated battery powered system?

I'm currently in the process of "designing" (selecting) a DC-DC Converter solution for a battery powered widget that will operate in the desert. It has to comply with various aspects of ...
-3
votes
0answers
58 views

Design Manual for Bumper cars [on hold]

I want to study the full engineering of bumper cars (Grid and vehicle), the one used in the entertainment industry for amusement rides. Can any one refer me to any design manual/text book relating to ...
1
vote
1answer
38 views

Chassis Grounding a Bipolar Floating Power Supply

I'm building a simple function generator powered from a 24V AC wall adapter. I've rectified the incoming AC to 24V DC using a full wave bridge and an LM317. I intend to split the supply into +/-12V ...
1
vote
0answers
53 views

Reverse current frying a boost converter?

AFAIK, most boost converters incorporate a diode or some mechanism for ensuring that current flows from the battery to the output. For instance, TPS61030's datasheet says that This device however ...
0
votes
0answers
55 views

why do we need grounding in inverter?

i am doing simulation for 120 dg, 3 ph BLDC motor while testing the inverter with R load the wave forms are not proper (positive square wave),but if i connect ground either(supply or neutral) ...
2
votes
2answers
41 views

Adjustable power supply simulator/reality

Hi im a student of computer engineering and im currently doing a project of a adjustable power supply it should be doing 0-30V but im getting some problems with the word adjustable haha,i got this ...
1
vote
1answer
50 views

AC power cord different on a laptop and a desktop, other appliances

If I look at the power cord plugged from the wall socket to desktop computers, monitors, etc. at the office, it looks like (North America): Now, if I look at the power cord plugged into my laptop's ...
0
votes
1answer
52 views

How the amperage of power source is computed?

Almost all power sources have the amperage written on them. How does the amperage of the power source is computed?
0
votes
1answer
39 views

Powering multiple devices from a single supply with 48V

First of all I asked this question in DIY.stackexchange.com, because of the cabling in the house. Here I would like to ask about the electronics (or electrical) part of it. And there is a very ...
0
votes
0answers
29 views

How to detect ripple in a specific frequency range on a power rail?

I'm struggling with a circuit that should monitor the ripple between 1000 Hz and 4000 Hz of a power rail (48 V). It must be able to detect if the peak to mean ripple is larger than 2 V. My first ...
0
votes
0answers
9 views

OLED segment voltage reference pin

what is the purpose of a segment voltage reference pin in general or particularly in a OLED display controller SSD1322. The datasheet says: When external VSL is used, connect with resistor and ...
0
votes
1answer
58 views

Using capacitors to supply peak current

I hope this thread is allowed. Based upon my previous topic, which turned out to be the exact opposite of what I needed to accomplish, I have a few questions. I have a 240W 24V Supply: ...
0
votes
1answer
20 views

Powering an External Phone Ringer - Straight Talk Home Service

My dad is having difficulty hearing his cordless phone ring in his shop, due to ambient noise. He has the phone connected to a Straight Talk home phone service device. So, there is no legacy analog ...
0
votes
2answers
59 views

Battery gauge – Microcontroller 3.3V using a 4.8V NiMh battery source

Well I am currently working on building a battery gauge via LED. My target is a red LED to blink if batteries are going to die and a green LED to blink if the batteries are fine. Researching on ...
-2
votes
3answers
97 views

How to determine the maximum power required by given devices? [on hold]

I need to power 4 devices with these power input specs: ...
0
votes
1answer
75 views

Three questions about the use of a transformer in switching power-supply

In this document (an introduction to switching power supplies) a boost-mode switching power supply is presented: it has a simple inductor, diode, capacitor and load. Then (page 9) it is specified that ...
0
votes
0answers
27 views

Test a ssd1322 based display

What's up folks? I have a problem with one OLED display based on the ssd1322 controller. The DD-25664GE-1A is a 5.5 inches display for which I made a custom PCB connecting the controller to a ...
1
vote
2answers
71 views

I2C Bus is Not Responsive When Engine Is Running. How to Diagnose and Fix?

I've got a solder-less bread-boarded prototype microcontroller with a few I2C devices that take some measurements on a motorcycle. For now, The MCU is powered by a LM7805 with decoupling caps near the ...
0
votes
2answers
49 views

DC Supply Load Dummy based on NPNs

I am fixing an old regulated load dummy that I use in my workspace. It was a mess and I want to modify its regulator side. My question is: will the circuit showed in the image work properly? If you ...
0
votes
1answer
58 views

High voltage AC-AC or DC-DC buck conversion

I have a schematic for an amplifier which if supplied a lower voltage will still work as a low-wattage amplifier. In the original circuit this is achieved using a 3-tap transformer: I would like to ...
2
votes
1answer
297 views

Whats the overrall power available from two PSUs in series?

Consider this circuit: PSU 1 is rated at 100w, PSU 2 is rated at 200w. How do I calculate how much power is available to the load, given the mis-matched power supplies?
0
votes
1answer
48 views

Power supply switching - Ground connection

I am designing a system that has 2 power inputs and has to be working as long as these power supplies are fine. I mean, the system starts working with power supply #1 but if it fails, switches to ...
-2
votes
0answers
38 views

Using UPS as portable electricity supply? [closed]

Would a UPS system be usable for portable mains power or would the deep cycling kill it in no time? I'm considering buying a 650VA / 360W UPS to power a 20W device outdoors - roughly how many minutes ...
0
votes
2answers
63 views

what battery(s) do i need to power a 12 amp 200 mph motor for 1 hour?

I have a plug in leaf blower/vacuum and would like to convert it to battery power. here is a link to the equipment in question. ...
-1
votes
2answers
51 views

Powering a ESP8266 and an auxiliar device using a single power source

I am trying to connect two components to the same 12V/1000mA DC power source. The devices are 300mA/9V (D1, auxiliar device) and 500mA/3.3V (D2, ESP8266) respectively. See the diagram below: ...
1
vote
2answers
106 views

Is there a way to buffer current for high usage periods?

I am using a USB port as a power source(500-1000ma) for my latest design(Wireless Comms and lots of LED's) and most of the time things work perfectly. However at times I do get spikes where the ...
0
votes
3answers
83 views

Suppressing contactor coil inrush, is this possible?

http://www.kvc.com.my/EnterpriseChannel/SharedResources/Datasheet/0/?ProductId=1000066755&Filename=SCHNEIDER-LX4-FH024.pdf I am trying to operate a 24VDC coil with an inrush of approximately 30A, ...
0
votes
3answers
99 views

Can I combine 3x 1000ma power supplies (wall warts) to get a 3amp supply [answer: no]

I have a device that requires 3amps 9v. I also have 3 1000ma power supplies (wall warts.) Can I cut the wires of these power supplies, reconnect them all together in parallel, and use them all as a ...
0
votes
1answer
64 views

Power Switching with Microcontroller

I am in the process of designing a device for a uni project. As a requirement, we are required to have a very low power consumption whilst in standby mode. Our plan for this, was to have our 2 x +-5V ...
-13
votes
0answers
57 views

power supply switching circuit 12 volt DC [closed]

I need optimized power supply switching circuit (12 volt DC). Most circuits on other sites is not good. thx
0
votes
1answer
37 views

Supplying an appliance with multiple power supplies

Can I supply a single appliance using multiple power supplies? For example if an appliance requires 100 watts of electricity, can I supply it with two power supplies, both of 50 watts?
0
votes
1answer
49 views

Momentary Button as Switch

I have a project that uses a computer case and PSU, but not motherboard, to turn on the PSU, all we know is to put green cable to GND. The problem is the ON Button, it's momentary and I need to keep ...
3
votes
1answer
63 views

Can a power supply still provide a voltage if it is broken? [closed]

I have an ATX power supply that I'm trying to use, but it doesn't seem to power my computer. The power supply turns on and the fans run and I also checked all the voltages, which are correct. However, ...
-5
votes
1answer
95 views

Amplifier for Driving a 8 ohm speaker [closed]

I had extracted a 8 ohm speaker(one) from my old speaker set,Which needed a very bulky adapter for Power,I tried googling the specification and found out that orginal speaker set which was a pair of ...
7
votes
3answers
318 views

Why do linear voltage regulators have minimum output voltage > 0 V

I am trying to pick linear voltage regulator for my project (lab. power supply). I am stunned, that only very few regulators claim to have output adjustable to 0 V. It seems to be due to the fact, ...
1
vote
1answer
89 views

Current specifications for parallel circuit from two cross connected power supplies

I have two 24 volt DC power supplies (that each look like this - according to documentation). ...
1
vote
1answer
45 views

Wiring 2 ac to DC power adapters together [duplicate]

I have a mini amp and several powe adapters. Can I wire 2 6 volt DC power supplies together for the required 12v DC the amp needs? If so, how? And it suggests 2 amps. Are amps cumulative, and does it ...
1
vote
3answers
418 views

Voltage dropping capacitor doesn't work?

I connected a voltage dropping capacitor in series with 220v AC supply and I measured the output voltage and it was 220 v too. I was expecting to get a voltage that is less than 220 volts. Did I make ...
0
votes
0answers
59 views

Power Consumption [closed]

I have a power supply circuit. It is a power supply unit with 32 AC output channels. And I do not know how to calculate power consuption. What I know is , I am givin 60 Volt DC, from power source ...
1
vote
1answer
58 views

Converting a DPS800 server PSU into a standalone 12V PSU

I recently got my hands on 2 server PSUs from a HP Proliant DL380-G5. HP model DPS-800GB A REV 06M Series HSTNS-PD05 Partno: 379123-001 (They appear to be made by Delta, going from the logo on the ...
0
votes
1answer
91 views

Rapidly switching on and off a 12v power supply, bad idea?

I was just wondering if this would be a bad idea, the power supply is connected to the mains power and would only undergo this at a max of 10 minutes at a time. would this cause any damage to the ...
0
votes
1answer
65 views

Few doubts about turning an atx psu into a bench lab power supply [closed]

First, thank you for your time of reading my questions. As the title suggested, my questions are about turning a computer power supply into a lab power supply. I already did my homework and read ...
2
votes
1answer
150 views

which is better? 5V or 3.3V as the supply voltage

I am about to design a new microcontroller based project. I checked all components (few) and all can operate at 3.3V or 5V. the microcontroller itself can also operate at 3.3V or 5V (pic micro at only ...
2
votes
1answer
76 views

is it safe to have hot wire connected to ground (metal case, shield) via a capacitor?

I have opened a psu, and I saw a small capacitor is connected between one of the ac inputs and to the ground/shield. We don't have ground in our ac outlet, so a hot 110v ac line could be connected to ...
1
vote
1answer
63 views

checking for 'dirty' power on a power supply using only a multimeter?

this is a follow up from http://superuser.com/a/958165/43268 It was suggested that i check a 19VDC power supply for "dirty" voltage. If i had a oscilloscope i could probably follow the excellently ...
3
votes
4answers
129 views

Switch Mode Alternative to LM7805/LM7905

I am attempting to design a dual rail power supply PCB for a university project. There are a number of restrictions - namely that it maintains > 80% efficiency regardless of the current draw. I was ...
0
votes
1answer
76 views

Can the LD1117V33 handle short peaks of up to 900mA?

Got a project with the typical 5V and 3.3V power requirements. My initial prototype I used the LM3940 (datasheet). This worked pretty well but these regulators are damned expensive here in Australia ...