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

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0
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2answers
56 views

Linear vs switching power supply

I want to build my own switching power supply however i already can do up to 10 Amper Linear ones so im just wondering why would i have to learn to do switching over linear? what makes them special if ...
0
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1answer
33 views

How to wire Mean Well RT-65D power supply?

I'm not very familiar with electronics. Especially I have never wired a 230 V power supply manually. There is a Mean Well RT-65D power supply. I have a rubber connector with open wires blue, brown ...
5
votes
3answers
376 views

What should I use for powering a Raspberry Pi at near space altitudes?

I'm planning a high-altitude weather balloon project (to around 100000 feet) some time down the line to take video and pictures of near space altitudes and I have some questions I need to ask before ...
0
votes
1answer
64 views

Chattering relay on microcontroller power supply

I am working with a device that has a relay on the 12v power supply to the micro controller that runs the device. Under certain unplanned circumstances this relay can chatter. What is the potential ...
0
votes
0answers
49 views

Is it plausible for this battery to charge 32% this quickly?

So my phone ran out of charge earlier. I stuck it on charge and turned it on. 5 minutes later I came back to it and the screen said that the battery was 32% charged, which seemed a bit odd to me. So ...
0
votes
1answer
19 views

I am looking to isolate an inverter when power from a generator is applied- debounce relay?

I have tried to find specific info on this scenario with no luck The situation is this; Off grid power system 12v battery store runs 12v lights etc. and an inverter for things difficult to run or ...
-2
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0answers
33 views

Sparking and ticking power supply [on hold]

I have a USB 2.0 external enclosure for 3.5" SATA Hard Drives. It always worked fine, but today, when I plugged it in, the Hard Drive didn't start and the LED on the (external) power supply didn't ...
-1
votes
1answer
27 views

maplin xm22y power supply [on hold]

I have A Maplin xm22y and the main power transistor blew. I ordered a replacement transistor (tip3055), but wonder that since the transistor is broke I now have a 23 vdc reading. Is there a way on ...
0
votes
0answers
81 views

I think I have burnt my 24V DC motor

I had a 24V DC motor connected to a Polulu motor driver which was connected to an arduino uno board. I accidentally connected a power supply instead of a volt-meter to both ends of the motor while in ...
0
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0answers
44 views

How long will a 1500VA/900 Watts UPS system power 3 typical laptops? [on hold]

I am attending a conference in the coming weeks and will need to power 3 laptops for 6 hours. I am considering buying this UPS to help. Will I get through the day with the power source? Each laptop ...
1
vote
1answer
23 views

Help selecting AC power adapter for DC car monitor [duplicate]

I purchased a Pyle 9" TFT monitor for use in an automobile with back-up camera. The wiring is designed to connect directly into the car's harness. I have no info on the electrical requirements other ...
0
votes
2answers
57 views

Info on transformers? Where to find?

I'm quite often taking things apart to salvage the parts and use them in my projects. Right now I'm taking apart an old PC-power supply for a switch-mode lab-supply project. The power-supply in ...
-3
votes
0answers
32 views

Are there any talking prepaid electricity meters? [closed]

an prepaid-meter that measures electricity consumption and provides voice messages to alert the consummer about the status of his or her consumption
3
votes
1answer
101 views

Floating supply and USB ground

I have a somewhat complex circuit controlled by an Arduino, which is supplied by a self powered USB hub (earth grounded 5V supply). A part of the circuit has to be powered by 12-20V DC. When I plug ...
1
vote
2answers
193 views

Full wave rectifier capacitance calculation

For making 100 amperes, 50 volts full wave rectifier, how do I calculate the circuit capacitance to avoid the ripple voltage? I mean which size of capacitor should I use?
1
vote
4answers
160 views

Why do we need 3 phase power supply?

Why do we need 3 phase? For the reason that voltage will never be zero in 3 phase? OR we need high voltage?
0
votes
2answers
59 views

Can I use the 12V line of a computer PSU to power my circuits?

Or is there any issues I should be wary of? I need at least 7A on a 12V line, but I've found that a computer PSUs are significantly cheaper.
0
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2answers
74 views

Design help for my 1A variable power supply

In a 1A Variable Power Supply circuit given below is it possible to use a 2A transformer and 1A bridge diodes.
2
votes
2answers
181 views

Creating an isolated power supply to prevent effects of lightning

Transformers isolate the load completely from the primary power source. Does that mean that I can connect two or more transformers one after the other and expect my Linear Power Supply to have better ...
0
votes
2answers
33 views

Joining a raspberry Pi to an external hard disk cage power supply

I have an external SATA hard drive enclosure that has its own power input. I would like to be able to run a Raspberry Pi from the same power input. The enclosure takes a 12VDC input (currently I'm ...
0
votes
1answer
52 views

COTS solutions for ±18V DC (or even ±20V) and ±30V PCB-mounted power supplies in the 3-5 Watt range

Most manufacturers make DC-DC converters with only ±15V or ±24V outputs for driving opamps. Opamps generally fall in several max-DC-supply classes. Typical are the ±22V ones (e.g. LM741 and a ton ...
0
votes
1answer
49 views

Is there any offline circuit simulator software that can simulate a noisy power supply?

I have been using Circuit Wizard (Its the only offline program that I can find!). Unfortunately, it is really basic, and I have outgrown it. I need to simulate a 5V circuit with a noisy power ...
8
votes
2answers
1k views

What is the use of magnets around electrical cables?

I haven't seen any for a while now, but a couples of year ago I saw some several times: cylindrical magnets around electrical wires. I'm not talking about specialized equipments but items of everyday ...
1
vote
1answer
40 views

Minimum voltage input for thermoelectric unit

Context: I am trying to make a drink cooler with a thermoelectric unit (peltier unit). I want to supply the minimum amount of energy as possible to the peltier unit. Now on my peltier unit, it says ...
0
votes
1answer
59 views

Trouble running 2 devices on a single 12VDC power source

I am using a dual connections to bring 12VDC power to both a video camera and a telescope mount. Both devices are supplied by the same 12V 5A transformer and I am using a split VDC power cord that I ...
0
votes
0answers
28 views

Adding Battery amps [duplicate]

Can you get more amps out a bank of batteries with different configurations? I know that if you put batteries in series you add their voltage, so you have more electrical pressure. And if you put ...
0
votes
0answers
21 views

Piranha LED board connected to USB charger [duplicate]

Can I use this Piranha Light board to connect to a 5v power source like a USB charger? Do I need something extra (more than an USB-cable)? And can I connect more boards to the same circuit? (New to ...
0
votes
1answer
37 views

External power supply necessary to run two stepper motors from a RPi?

I am following this tutorial for a CNC laser engraver. I have two stepper motors from some old DVD drives and two L9110S H-bridges to control them. I am now working on putting it all together and ran ...
0
votes
1answer
55 views

What capacity LiPO battery is equivalent to 5 AA batteries?

I have a Casio MA-120 keyboard (musical). Which requires 5 AA batteries. On back of the keyboard there are power source instructions which says: ...
4
votes
0answers
46 views

How to disconnect voltage from BeagleBone Black expansion pins?

I'm trying to create a cape that will safely power my BeagleBone Black from my car's electrical system. The design I am using is based on the one from this answer. The circuit there suggests a simple ...
0
votes
1answer
61 views

Simultaneous Buck-Boost or Flyback Regulator - Help Selecting Chip [closed]

I have been trying to find a switching DC power supply that outputs a constant voltage of 12VDC, given a variable input between 4V and 25V. It's to my understanding I'd need a buck-boost converter, ...
2
votes
1answer
100 views

Boost regulator: Unexpected output voltage

I just finished setting up an LM2577 as a boost converter, and have run into some unexpected issues. For starters, here is the recommended "typical application circuit": My application circuit is ...
0
votes
1answer
58 views

Splicing barrel jack shapes

TL;DR: How can I "splice" two different cords for different barrel jack sizes? I'm rather new to this sort of stuff, so bear with me here. I am attempting a project where I need to create a port on ...
0
votes
2answers
48 views

Can I use a 12V 70A source to convert/boost to 24V 5A supply?

I have a self built custom made computer that is using a Ultra X3 1000 watt power supply. Over the years I have been reducing the power needs by adopting more energy efficient hardware. My computer is ...
0
votes
2answers
34 views

Variable output PSU switch configuration

So I am designing a switchable voltage 9V/18V power supply and was wondering, what's the best way to switch between outputs, that's the current schematic I came up with: Original image size So my ...
2
votes
3answers
109 views

Mixed analog-digital power supply

I'd like to build a project where I'm essentially controlling analog signal generation in the audio range from a microcontroller. In other words, an analog synth with digital control. I'm at the stage ...
0
votes
2answers
125 views

What is this power supply connector and why was it likely chosen over a 12V DC?

This is from a 3.5" hard drive enclosure that I am tempted to throw away since I don't have a plug. What likely influenced the design choice to use this sort of plug? The hard drive itself likely ...
-2
votes
1answer
62 views

How to calculate resistors of this VCCS

R1(e.g. 1KΩ) How to get the value of R2 R3 R4...R6? If someone have the answer, Thanks! Here is the context of the diagram.
-1
votes
2answers
70 views

Combining power [closed]

On a computer power supply can I add 12 volts and 5 volts supply to get 17 volt supply? **Edited for clarification
0
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0answers
30 views

Power Supply Requirements [duplicate]

I am building some prototypes for my thesis but I am not sure how to buy the power source for them. I need to how to choose a proper power source(Volts, Amps, etc). The number of motors will vary but ...
-1
votes
1answer
50 views

If the efficiency of a power supply is 60% when the input power is 25W, what power is delivered to the load

If the efficiency of a power supply is 60% when the input power is 25W, what power is delivered to the load? The formula for this problem is: $$ Efficiency = \frac {Pout}{Pin} \times 100% $$ Where ...
0
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0answers
42 views

Motherboard Running on Li-Po Batteries Rebooting Randomly [migrated]

 I am using a MSI Z87I AC motherboard with an Intel Core i7 4770T (2.5Ghz 8MB 4C 8T) processor, 2GB of DDR3 RAM and a 32GB SSD. This setup is used on my autonomous underwater vehicle. The power ...
0
votes
2answers
66 views

newbie question: can I plug a 250v power strip into a 120v power outlet (and then connect three 120v power adapters to the power strip)?

I'm sorry if the question is too dumb, but I was wondering if I could connect a power strip rated for 250v into my home's power outlet (120v). I wanted to connect 3 power adapters rated at 120v to it ...
0
votes
1answer
46 views

Heat dissipation

I have a computer power supply and I'm wanting to make it a variable voltage power supply but I have to have a load on it which requires some resistance. I have connected a 10 ohm 10 watt at 10% ...
0
votes
1answer
63 views

Is there a difference between “voltage supply” and “power supply”? [duplicate]

A device, circuit, actuator or chemical structure which outputs a fixed voltage level is usually called with one of the following terms. Voltage Source Voltage Supply Power Supply Is there any ...
1
vote
2answers
216 views

Where can I learn Switched Mode Power Supply Design? [closed]

Recently I've had terrible luck buying those little DC-DC boards from China off of eBay. We've been trying to build projects where we have some sort of wobbly input DC off of a car or solar, ...
0
votes
2answers
97 views

Linear regulated supply from noisy input voltage

I have been working to redesign a faulty circuit board. One of the problems I have identified is the power supply on the board. The input voltage is nominally 13.8V DC from an AC switchmode ...
1
vote
0answers
43 views

Connect sensor to 1-wire dual counter - different power sources

I am much more comfortable in software than hardware, but I'm working on a home automation project to track water usage. I have a Dinel AFP-966-S fiber optic sensor positioned over the water meter - ...
2
votes
2answers
104 views

Powering multiple devices from a single power supply

I am learning electronics on my own and have been having a lot of fun. I am currently working on creating a Nerf sentry gun for fun with my son. I am at a point there where I need to power multiple ...
1
vote
2answers
94 views

PFET to turn on/off system power

I have a Raspberry PI board connected to some external circuitry, and am using Microchip MCP23008 I2C GPIO expander chips to control external LEDs and motor circuitry. One important part of this ...