Tagged Questions

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

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0answers
38 views

How to read part number on a transformer? Inside Dell power adapter LA65NS0-00

I have a dell power supply that doesn't work anymore and am trying to salvage the parts: http://www.amazon.com/LA65NS0-00-Dell-Inspiron-notebook-Adapter/dp/B00115AOTA There's a transformer in here, ...
0
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2answers
49 views

Any simple power supply designs for a 24VAC transforrmer?

I'm a beginner in Electronics Engineering. Any suggestions on simple power supplies with PCB designs which are run by a 24VAC transformer? Thanks!
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1answer
40 views

Active power & transfer function

Why is it that the real part of \$G(j\omega)\$ (where \$G(s)\$ is transfer function) is related to active power of the circuit?
-1
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0answers
30 views

phase shift (how to calculate)t

how to calculate the phase shift(Uin-Uout). R1=100K, R2=30K, C=4,7µF. f=60Hz
0
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1answer
47 views

Switching power supply 220V-5V

it's a long time that I'm looking for a 220V - 5V 200mAh switching power supply and I haven't found my solution... My board uses ...
0
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1answer
64 views

I want to run 20A constant current and 4.2V on a load using a variable DC power supply rated same

I want to run 20A constant current and 4.2V on a load using a variable DC power supply rated as 20A, 30V. But because my power supply is a switching CC, Cv type, and it kept switching to CV at only ...
0
votes
1answer
49 views

Replacement of 2N3822 and 2N5640 for a 0-12v adjustable power supply

I'm trying to make an adjustable 0-12v 0-500mA power supply. I'm using the following schematic as a base (I modified the 240Ohm resistor between Vout and Adj of LM317 2, and the RSC resistor): The ...
0
votes
1answer
50 views

Connect mulriple grounds to one external connector Eagle

For my project I've designed 3 power supplies, 1 5V, 1 3.3V for the supply of the micro controller and one 3.3V for 3 INA 226 shunt monitors. I do have some questions regadering the ground. de power ...
0
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1answer
37 views

problem with reference voltage of AD620

This is a AD620 instrumentation amplifier for single supply operation when i tested the below circuit on a bread board , it is giving zero voltage output for input of 0V to 1V input and then giving ...
0
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1answer
65 views

Identifying an IC named ID2J

Recently I was working on a 5V switching power supply project and I found the best PCB for building it. But in the middle I got confused when I saw an IC with the letters ...
0
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0answers
32 views

half bridge … transformer and devices overheating

I have made a SMPS for Audio Amp with the following Spec Input Voltage range - 100 - 270VAC Line frequency - 50Hz Output Wattage - 550W Output Voltage - + - 50V @ 5.5A These are very basic ...
1
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2answers
179 views

What is this component in the image?

I am trying to know what is the black circular component stacked in front of the switch and adjacent to the large capacitor in this circuit board. I am not talking about the transistor with the heat ...
0
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1answer
43 views

Multiple voltages power suply, high current

I'm trying to design a battery back-up power supply for my home network devices. I need these: 48 V / 40 A 24 V / 10 A 12 V / 2.5 A 5 V / 5 A I got a 48 V / 60 A industrial power supply with ...
0
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0answers
68 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 ...
0
votes
1answer
74 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 ...
0
votes
1answer
74 views

Reactive power problem [closed]

Can reactive power be drawn (increased and decrease as required) from an LC tank circuit?
0
votes
3answers
69 views

power selector switch [closed]

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
votes
1answer
198 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 ...
1
vote
1answer
45 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 ...
1
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0answers
52 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 ...
0
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0answers
36 views

Quality Power Supply [closed]

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 ...
0
votes
2answers
78 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 ...
0
votes
1answer
94 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 ...
0
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0answers
36 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 ...
0
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0answers
41 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 ...
2
votes
3answers
179 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
42 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
416 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
77 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
55 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
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 ...
0
votes
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 ...
1
vote
1answer
28 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
63 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
1answer
109 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
213 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
171 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
66 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
votes
2answers
80 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
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
36 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
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
votes
1answer
53 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
44 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 ...
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
41 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
57 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: ...