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

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using matlab how do draw single- line diagram of circuit? [on hold]

How to draw a single-line diagram of any Power System Analysis in MATLAB ?I used SimPowerSystem but i wanted to draw any model i wish.
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45 views

Quick and dirty power supply for 127~240VAC to 25A@12V or 5A@60V, or other approach

I am thinking of a Emergency Beer Can Chiller made of up to five 5A@12VDC Thermoelectric peltier cooler plates like this one, one on top of another. I need either 25A at 12V (5 plates in parallel) 5A ...
0
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1answer
61 views

Can I use this power supply? [duplicate]

This may (and probably will) sound very silly, but I rather ask first than destroy my childhood memories - I found my old sega mega drive at my parents home, but it had no psu. I knew I had some psu's ...
0
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3answers
48 views

Limiting current draw on a camera battery charger

I have a camera battery charger which is driven from a 12V (measured 12.2) switched mode wall wart rated at 1A. All three items (charger circuit, wall wart and battery) are stock, but all three heat ...
1
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2answers
81 views

How to connect 2 3v3 lines in parallel from different dc/dc converters?

Is there any way, to connect 2 different (but same output voltage) dc/dc converters? One of them works on 5 to 40 Volts, and one on 3 to 5.
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3answers
169 views

Linear Power Supply Advice

I am new here to StackExchange and new to electronics in general. As my second electronics project (the first being a blinker circuit for a bandolier of LEDs) I am building a regulated linear power ...
2
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0answers
36 views

Inherent exploitability and power state machines

I'm working on understanding power state machines in regard to mobile computing devices. Most of the information on this subject seems to stem from this article. It's not particularly important to the ...
0
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1answer
76 views

why emitter is connected to high level and collector to low level?

generally, in all switching circuit, emitter is connected to ground and collector is connected to high level. i am not getting why is it so? is there any special purpose?
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2answers
72 views

Role of Inductor in power supply section..?

I'm interfacing a TFT display with MCU which requires 450mA current & 3.3V. In power supply section I have used regulator ICs to get 5V & by using two diodes I'm getting 3.3V. For filtering ...
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2answers
77 views

Modifying HV supply for digital control

I've built the HV supply shown above (from here http://desmith.net/NMdS/Electronics/NixiePSU.html). And it works great. I would now like to be able to digitally control the output voltage. This is ...
0
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2answers
53 views

How to convert counter status to some non-electrical quantity, so that I can see the status without power supply

When I place the instrument in the central unit, it'll get power and increment the counter by 1. But when that instrument is removed from the central unit it has to display what was the last count. ...
0
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1answer
83 views

Capacitive transformerless power supply, AC polarity problem

I have implemented a "Capacitive transformerless power supply" to control a microcontroller-based circuit that contains capacitive touch sensors, and I had an "AC polarity problem" Surprisingly, the ...
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0answers
20 views

Transformer for fiber optic tree overheating [duplicate]

Fiber optic tree with synchronous motor (AC12V 50/60Hz, 1.2-2W) driving color wheel. Also has a MR11 6V 10W halogen bulb. Power source is TDC transformer with output of 12V ~1.0A (Input of120V~60Hz ...
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0answers
28 views

Does Armature current decrease as the load decreases?

I am being asked to find the speed of a 16.5kW shunt DC motor that is being supplied with terminal DC voltage of 300V when operating at 50% rated load with an armature current of 30A. I need to use ...
2
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4answers
104 views

Whats the point in conserving electricity if the AC current produced cannot be stored?

If we cannot save the ac current produced in a battery or some device like the DC current there is no point in conserving it because current once produced should be consumed somehow!! My faculty said ...
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3answers
79 views

How does a constant current (CC) power supply regulate voltage (V) in parallel circuits?

I see that some power supplies provide a wide range of output voltages meanwhile maintaining the current. For example: 2.7 A, 20-36 V output. I understand that the voltage rate will depend on the ...
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0answers
38 views

Issues in thermal on PCB

i design one power supply board in that some coils are placed on the surface of PCB, that means in center surface of PCB. these coils are dissipating more than 7W on PCB. because of this PCB is ...
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1answer
52 views

Independent voltage sources using voltage regulators?

I'm trying to design a variable power supply, and need some clarification regarding using voltage regulators in parallel as independent voltage sources. As this is a power supply, one of the outputs ...
0
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2answers
259 views

Can electronic components work without power?

Can electronic components work without power,with the help of temperature? according to my knowledge,I don't think so,until heat will generate some energy and that will drive component. I have to make ...
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2answers
59 views

Inrush Thermistor Bypassing

Hi I want to bypass an Inrush Limiter Thermistor. It is between the rectifying bridge and the smoothing capacitors, I was considering using a solid state device. After the rectifer current only flows ...
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2answers
46 views

Transformer Rating Selection

For selecting a transformer, I stumbled across the following equations for obtaining VA and IAC (citation here). I am dealing with a full wave bridge rectifier with a capacitive load. The wiki ...
2
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1answer
85 views

First steps in building Switching power supplies

I want to make a 50Amps switching power supply, I have already done 10A linear ones succesfully This time it has to be a switching power supply one so, any ideas or tips of where to start are ...
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2answers
115 views

Op Amp's Negative Power Supply to Ground

I am using a standard 741 Op Amp from TI. For me to amplify any signal, I am required to set +Vs = 15 Volts and -Vs = -15 Volts. I am now concerned as to what will happen if I connect -Vs to 0 ...
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0answers
52 views

X-rated capacitors in parallel

I want to build a transformer-less power supply (capacitive) to drive few 0.5W power LEDs from mains supply (230V). The 1uf X-rated capacitors I have are not good enough to drive them to full ...
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2answers
75 views

What is a pulse width modulation for DC motors really?

I have studied the Navy related materials on pulse width modulation but I'm not clear as to what they really are or what they're supposed to indicate. From what I read, the output of PWM doesn't have ...
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2answers
122 views

What's wrong with my switch mode power supply circuit?

I'm using a TPS54383 dual output SMPS IC from TI, putting out 12V and 5V; at least in design. I created a schematic and board and had it sent out to OSHPark and soldered it all up today and only the ...
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44 views

Zener Diode identification (color bands)

I am trying to fix power supply, but I have a problem with identification of parameters of zener diode. Diode at the photo is shorted. Can anyone help me identify the value, based on the coloured ...
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1answer
44 views

input amps for 10 amp power supply

I am looking at installing some LED lighting which requires a 12v DC 10 amp power supply. The question which I cant seem to find an answer for is this... I live in the UK which uses a nominal 240 v ...
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0answers
61 views

Discrepency with experimental vs. simulation of AC-DC circuit

I'm analysing a PIR Circuit's power supply, but I'm having a large (almost double) discrepancy between simulation/theoretical current values and experimental values (experimental is almost half ...
3
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2answers
605 views

How does this non-isolated circuit create 12VDC from mains supply?

I took apart a PIR sensor, and inside it has a circuit similar to this (it uses the same chip): I don't quite understand how this rectifies and creates 12VDC. My understanding so far is the (68 + ...
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2answers
53 views

Ensuring common ground in a circuit with several voltage requirements

I'm working on a project that has components requiring various voltages. 3.3v --- to power a set of laser diodes (qty 24 @ 50mA = 1.2A) 5v --- to power a set of infrared transceiver sensors (qty 24 ...
0
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1answer
33 views

5v DC 1.0A micro USB device hooked to an 5v DC 2.0A charger [closed]

I've bought an Power Bank rated 5v DC 1.0A in it's input but it's extremely slow to charge via USB port, which provides an maximum of 500mA as i read in internet. I have and outlet USB phone charger ...
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48 views

Connect single phase loads to three phase supply

I may need to opt for a three phase supply if the single phase loads need more than 3.6kW. In that case I'm looking for a way to use those loads with that supply. In a previous thread (which was ...
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1answer
58 views

Charging phones with lots of current [duplicate]

My question is, what if I want to charge my iphone that uses 5volts via USB, however what if I had a powersupply that could deliver 5volts upto 10amps, if I used this to charge my phone would it ruin ...
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0answers
36 views

DIN rail buttons and pilot lights

I need to build a power distribution unit for a cabinet which will have upstream: Main circuit breaker (inside) Residual current device (inside) Emergency button (outside) Main power button ...
0
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1answer
139 views

Is it safe to parallel connect components to a single to a 12v DC PSU?

Prerequisite: For a home-decor project, we wish to work with different LED strips and even a larger LED chip as a central lighting source by attaching everything to a powerful, high quality 12v CC/CV ...
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1answer
87 views

How does underdriving a powerful (eg. 50w, 100w) LED chip work?

My question concerns under driving an LED chip. Unlike quality brand chips (Bridgelux, Cree), in my experience, under-driving non-brand ones make things more long lasting and favorable. Using the ...
2
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1answer
161 views

How much current can you pull safely off a standard AAA battery?

This might be a stupid question. But how much current can you safely draw from a AAA battery. I am currently powering my project from a worktop power supply and it draws at 5V 0.45A during normal ...
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1answer
40 views

Power management at thermal power station

I have weird question, but I hope somebody can give at least hint what should I read to understand the concept. Imagine situation: There is thermal power station and a city that takes power from ...
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1answer
55 views

Can I use a halogen transformer as a power supply?

I have an electronic transformer which is meant to be used to drive a 12v halogen light. The specification on the electronic transformer box says 220-240VAC input, 12VAC output 20-60W. When a 50W ...
3
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2answers
366 views

Microcontroller soft off circuit not working - why?

I was making a board with an atmega328 mcu (to be used with Arduino libraries) to do some one wire communication stuff. Since I was etching the board anyway, I decided to try and implement a simple ...
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1answer
56 views

How do I get multiple voltage lines from a single PSU output?

Suppose I have a regulated power supply that has +20V and -20V outputs, and an amplifier circuit that uses them. I also have a push-button (not momentary) power switch with an integrated LED which ...
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2answers
63 views

Confusion: Power Bank and Mobile Charging [closed]

MI Power Bank 10400 mAh rated power bank. It has 93% conversion rate. It uses the USB standard to charge phones, so I am assuming a 5V output voltage. So the total energy 'content' = \$10.4A \times 5V ...
5
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3answers
726 views

What is the difference between different types of GND

I would like to know the difference between different types of Grounds like AGND, SGND, Battery Gnd, PGND. Are all the grounds not same? Cant we connect the device to any one of these grounds?
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1answer
35 views

Combining different power sources for hybrid power plants

How can we combine two different power sources? For eg:AC output from a windmill and DC from a panel situated near? Will the combined output be greater?
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3answers
121 views

What happens if I supply a higher voltage than the rated voltage of my jack?

I want to replace the original jack from my notebook with a new one since it is broken (and I would like to avoid to replace it with the same as the original). The original AC adapter supplies 19V and ...
2
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1answer
67 views

Determine the maximum load of a power supply

I am trying to upcycle an old bit of tech I had lying about. The main part I am looking to recycle is the power supply however I do not have specs of the power supply itself. I have measured an output ...
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2answers
256 views

How hard/possible it is for an engineer to make this happen?

I need to get one of these power supplies to use it in something I'm developing. The problem is that where I live there are no shops that sell this. What I need is this: If I'm not mistaken, this ...
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3answers
605 views

Very small 12V DC power supply

As a second part of my bad question about voltage converters . Well, I was asking about a regulator to get me from 220V AC/DC, into 12V DC . A regulator can't do that , but today I got the Apple ...
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27 views

Help with designing negative part of Dual-Sided SMPS

For a project of mine, I'm trying to make a dual-sided SMPS that has independently variable positive and negative supply rails, current limiting, short circuit protection, etc etc... My current plan ...