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

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51 views

Help identifying a voltage regulator

I'm trying to build a portable screen so that I can watch movies around my apartment if I need to move away from my TV screen (think a WiiU gamepad or a tablet). I have many raw components and I think ...
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1answer
63 views

Get clean 9VDC power from 9VAC using a LM317T

I'm having trouble with this design, I have this circuit below, but I already have the 9vAC transformer, so I just need to convert the current to DC, so: If I remove the Vadj part of the LM317T on ...
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1answer
63 views

Reactive power problem [on hold]

I've designed a transformer that runs off reactive power (current at 90 degrees with 20W resistive load at present). I'm using a 12V battery supply with an H-bridge module to run it (1.4 kHz square ...
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3answers
65 views

power selector switch [on hold]

i'm still working on my usb meter. I still have a problem in my design, I would like to implement an external power supply and a battery. I was looking for a circuit that would switch automatically ...
3
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1answer
189 views

Why do they separate some parts of PCBs through making wide holes? [duplicate]

I have seen several PCB that they have wide holes in some their parts (especially the supply of circuits parts). for example take a look at this picture: and on the board: Not sure but I think ...
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1answer
34 views

can I charge Mobile battery using mobile charger directly?

I want to charge mobile battery of 3.7 v directly by connecting 2 terminals of charger(5 v output) to two terminals of battery. My questions are Is IT POSSIBLE? what must be voltage adjusted to ...
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0answers
43 views

Building a +/- 150V DC power supply

I'm trying to build a +/- 150V battery powered DC power supply variable power supply. I have two of these 150V nixie power supplies: http://desmith.net/NMdS/Electronics/NixiePSU.html And was ...
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0answers
36 views

Quality Power Supply [on hold]

I m looking for a quality AC to DC power supply (5V/3A in my case), with excellent winding insulation (~ 100Mohm), universal and regulated of course, but that also is "true" relative to earth. What I ...
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2answers
72 views

High voltage power lines

Why are high voltage power lines used? Electricity is generated at 11,000V...so is that a potential at the generating station or potential difference across the ends of the power line? And if it is ...
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1answer
87 views

How does 3 phase power operate single loads?

I am wondering how 3 phase power is used to power, say for example, light bulbs? If I have 3 phase power coming into my house, how are the 3 phase combines to enter the one prong of an electrical ...
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0answers
32 views

Powering circuit with alternative and/or concurrent power sources

I have one of these led projectors which is normally powered by the embedded motion sensor. I want to be able to power it manually by a switch button. I need to do this in both alternative and ...
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0answers
38 views

Safety / protection considerations for non-switching power supply

My quest for understanding the nuances of circuit protection continues. Today, I'm thinking about the power supply for a device I'm working on. It will need voltages which are somewhat hard to get in ...
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0answers
44 views

Valiable Power Supply +30V to -30V @ 1.5A [on hold]

using a.c input 220V how to build a power supply ranges from -30V to +30V @1.5A and i am especilly willing to learn that how to include negative portion alongwith positive?
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3answers
172 views

What is the advantage of a switching over a linear power supply?

I want to build my own switching power supply. I already know how to make a 10 Ampere Linear supply, and I'm wondering if I should bother. What do I have to learn to do a switching supply? What makes ...
0
votes
1answer
36 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
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3answers
406 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
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1answer
75 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 ...
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0answers
54 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 ...
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1answer
20 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 ...
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0answers
36 views

Sparking and ticking power supply [closed]

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 ...
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1answer
32 views

maplin xm22y power supply [closed]

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
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0answers
90 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 ...
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0answers
46 views

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

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
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1answer
26 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
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2answers
62 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 ...
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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
108 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 ...
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2answers
201 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?
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4answers
166 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?
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2answers
63 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.
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2answers
79 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.
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2answers
185 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
35 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
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1answer
57 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
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1answer
52 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
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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
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1answer
42 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
61 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 ...
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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
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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
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1answer
39 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
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1answer
56 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
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0answers
55 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
65 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
106 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
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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
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2answers
49 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
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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
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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 ...
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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 ...