Stack Exchange Network

Stack Exchange network consists of 175 Q&A communities including Stack Overflow, the largest, most trusted online community for developers to learn, share their knowledge, and build their careers.

Visit Stack Exchange

Questions tagged [power-supply]

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

0
votes
0answers
29 views

3.3V LDO Selection

If you've ever tried to find an appropriate LDO for your project you may have noticed the incredibly vast range available on the market. During my searches I discovered this particular regulator from ...
0
votes
1answer
19 views

Can I use DC to run an AC device in some cases?

I think there may be devices specified to use alternating current (AC) which can run supplied with direct current (DC) instead. There are devices which depend on AC in some fundamental way, like a ...
0
votes
0answers
35 views

Trying to identify a battery and its controller

Attached are two images of the inside of one of those devices to extend the battery life of your phone. This one was a promotional giveaway and only had their logo on the outside. I tried searching ...
0
votes
2answers
62 views

Could a blown voltage regulator still supply electricity?

(I'm new to electrical engineering, both the website and the topic, so don't hesitate to correct me) I'm building a very tiny form factor transformerless power supply with 5 V output. I was ...
-1
votes
0answers
27 views

Convert 240v to 120v for 120V Bulb

I'm having trouble to use my Philips Hue light bulbs, I bought one of their starter kit and later found out that it contained 120v bulbs. Luckily the bridge provided was 120-240v(aka universal). I've ...
4
votes
2answers
359 views

How long can equipment go unused before powering up runs the risk of damage?

I have an older solid state radio transceiver I want to power up but I understand that electrolytic capacitors loose their function after a long time of non-use. There are articles about reforming ...
0
votes
2answers
68 views

Why the replacement of 7812 with R-78E12-0.5, DC/DC makes the circuit not working?

I have this simple surge protector and soft start inside the PSU. My transformer is out of its specifications yields 21.3V after bridge rectification. And 0.1A load (12V fan for cooling pass ...
0
votes
0answers
29 views

Why Webench power tool suggested using this Hot-Swap Controller (TPS2420) for my design?

I was trying to build dc to dc converter that has one input which is anywhere between 9V-20V and has 4 outputs: 5v @ 2.5A, 3.3V @ 2.5A, 3.3 @ 1.5A, and 1.5V @ 1.5A. So, I sequenced the outputs and ...
0
votes
0answers
44 views

Power Supply for the Pre-amplifier I bought

I bought this China clone "Marantz-7-M7-Tube-Buffer-Audio-Preamplifier-Pre-AMP-Board-KIT" I thought that it was just simple. I just don't want to throw it away, but what does 220v mean input meant in ...
0
votes
0answers
31 views

Using 19V, 3.4A power adaptor instead of prescribed 12V,3A power adaptor on an embedded box PC

I have an embedded box PC: Advantech Ark1122H. Instead of the prescribed 12V,3A power adaptor, I accidentally used a 19V,3.4A power adaptor that is supposedly for another embedded box PC. Now this PC ...
0
votes
0answers
10 views

TINA/Spice/UCC3803: Unable to tune analysis parameters for 0.8 V to 4.8 V DC-DC boost converter design simulation

I need to simulate a DC-DC boost converter on TINA-TI. However, I cannot get the convergence necessary to carry out these simulations. I've tried using the parameters utilized in online reference ...
1
vote
1answer
38 views

Rectification voltage

I designed this power supply and simulated in Multisim 13.0, and noticed that the output of the full bridge was higher than that of the input to it. Would this have anything to do with the ...
0
votes
1answer
53 views

+/- 96 V transformer less power supply design

I know this is a dangerous practice, but obtaining a transformer to make a vacuum tube power supply in my country is prohibitively expensive. So i have to go for transformer less psu. I am just making ...
0
votes
1answer
55 views

I have a 2 A 12 V regulated power supply and I want to use it to emulate a 9 V battery for a breadboard

I have a 2 amp 12 volt regulated power supply and I want to use it to emulate a 9 volt battery for a breadboard. However, I need to protect the power source and the components used in my breadboard ...
2
votes
1answer
67 views

Can I use a 22 microfarad capacitor in place of a 10 microfarad capacitor?

I have a bad 10 microfarad capacitor 400V but can not get a replacement. Can I use 22 microfarads 400V instead?
0
votes
0answers
21 views

Using a single battery for robot motors and electronics

Instead of using two separate 12V SLA batteries (one for motor controllers*, one for Arduino, LEDs, sensors ...), would they work in series as one 24V battery, with a step-down converter for each ...
0
votes
1answer
25 views

protection board for 18650, voltage drop? normal?

I made a power pack using 18650 batteries from an old laptop. All batteries tested individually are good. 4 batteries in 2S format. I used a cheap 2S 3Amp rated protection board I got on Ebay from ...
0
votes
0answers
31 views

SCR reverse current during switch off

In the figure below is shown the dynamic behavior of an SCR in terms of its current during switch off. I'm interested in calculating the maximum reverse current (iR in the plot). The parameters that ...
0
votes
1answer
49 views

One time blink then turn off circuit

is it possible to change Circuit Diagram for the following example: http://www.redcircuits.com/Page146.htm or https://www.youtube.com/watch?v=mrxdiO1b29A Original: 4 short flashes stay on light ...
0
votes
3answers
46 views

Battery systems for 440v industrial motors

Are there systems utilizing batteries to start large (25hp - 50hp) 440v 3-phase electric motors, thereby eliminating spikes to the supply grid?
2
votes
2answers
31 views

Power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and forward current of 100mA

I am looking to power 9 IR LEDs 850 nm with a forward voltage of 1.7 V and current of 100mA. i want to make a circuit where i can use a small power supply or could I use the raspberry pi to power it? ...
0
votes
1answer
33 views

USB internal control to on/off a pc fan molex circuit

I am new to electronic circuits so I might not have the correct nomenclature for some items. Description: I have 3 high power 12V PC fans (NON PWM) connected to a hub that draw power from MOLEX ...
0
votes
3answers
46 views

Peltier wiring diagram

im just an electronic enthusiast #1? Is it posible to power the peltier with a motor speed controler 220vac input and varable output. If no, why? What are the remidies #2? And if i use a 48vdc power ...
3
votes
1answer
71 views

Switch between 2 power supply feeds without device losing power

I have done a search on here but didn't find the answer (maybe "woods for the trees") but here goes... A brief 'background' -- In my house, there's a switch by my front door that turns on/off the ...
0
votes
0answers
40 views

Power distribution board stops working properly when increasing maximum current limit on DC power supply or when connected to battery with higher Ah

As per my understanding increasing maximum allowable current limit should do nothing to circuit. But a particular optocoupler enabled port of power distribution board stops working. What kind of ...
1
vote
2answers
31 views

Compensating voltage drop in circuit

My brain seems to be stuck on this very basic circuit design question. I want to power a 24VAC load (solenoid valve) with the help of a switch (triac). This switch, however, creates a voltage drop of ...
0
votes
1answer
53 views

Power multiple parts of one project from one wall wart

I'm building a project with a high-power 10W RGB LED controlled by PWM from a microcontroller. Right now I'm using a wall wart to power the LED, and powering the MCU through my computer's USB. My ...
2
votes
3answers
87 views

Possible Error in Microchip Datasheet

I am working on duplicating a product according to the Microchip datasheet. http://ww1.microchip.com/downloads/en/appnotes/00857b.pdf My question has to do with something I found in the schematic (...
3
votes
1answer
116 views

RT6224D-based step down circuit yields 0V - why?

We received a set of prototype boards. They have a DC power supply input feeding into a step-down converter, which is built around an RT6224D. It is supposed to deliver 5.0V. The circuit is almost ...
0
votes
0answers
23 views

SIM800L Disconnecting Issue

I'm doing a project using SIM800L ebay module.I can send & receive SMS & calls. The problem is, on workbench its working, but in actual site environment when the GSM signal is low & it ...
0
votes
2answers
58 views

12vdc linear power supply enclosures

Is it safe to install a test bench , hobby, linear power supplies with 115vac/12vdc in 3D printed enclosures? The only protection im worried about is electrical shock and whether the transformers put ...
1
vote
2answers
78 views

What is the purpose of cylinder “second power bricks” on cords? [duplicate]

I have noticed a large number of power cords that have a PSU built into them also have a second brick on them. What is the purpose of this "second power brick"? Example, Xbox 360 Power Adapter: I ...
-1
votes
0answers
8 views

Using a step-up converter with PC's PSU to power monitor [migrated]

Is it a bad idea to use a Pololu U3V70A to step up one of my spare 12v cpu/pci-e connectors on my PC's PSU? The monitor I want to power requires up to 19v/5.79a.
0
votes
0answers
17 views

CCTV Camera power consumption [duplicate]

I have 3 cameras each rated 12V, 200mA. Please i had like to know if i can powered all the 3 cameras with a single 1Amps or 2Amps 12V power adaptor.
0
votes
1answer
42 views

tube amp - high power supply voltage ?! troubleshooting

So I started working with troubleshooting a channel imbalance on the schematic attached, 12ax7 + 6L6GC push pull. But the problem seems to be a bit different... My voltages seem to be a bit hot!! (a ...
1
vote
1answer
65 views

device suitable for generating AC voltage?

I want to test my circuit with different types of inputs. Is there any device or equipment that I should buy for generating voltages? I would like to be able to adjust the voltage and current by ...
1
vote
3answers
88 views

Why Does this Short? [closed]

simulate this circuit – Schematic created using CircuitLab I'm new to electronics and wired a dc motor to a battery and switch. After the battery got really hot, I realized that it was probably ...
2
votes
1answer
70 views

Voltage stabilizing circuit

I have the following case: I need a stable power for esp32 at 3.3V (around 300mA) for at least 10 seconds Power source is: not DC, it is irregular source provides bursts of around 1.0V each second, ...
1
vote
1answer
72 views

Hybrid power supply output voltage

I have a question. I want to make 30V/4A hybrid power supply with stepdown regulator LM22679 as an preregulator and LM338 as an linear regulator to smooth voltage. LM22679 would be powered by Mean-...
1
vote
0answers
63 views

How does this negative voltage generator work?

I managed to fry a piece of moderately rare equipment due to connecting it to the wrong voltage power supply, and I'm now trying to diagnose what's wrong. Luckily, reverse engineered schematics are ...
0
votes
1answer
35 views

Filter power supply for video signals

I'm drawing a board with an MCU (running at 32 MHz), some serials and an analog video section (mux and amplifiers). I kept the video section physically separated from the digital one: i.e. it's placed ...
2
votes
3answers
380 views

Supply current of negative rail

I'm using an LTC1983ES6-5 to provide a negative rail for both a MAX4311 and a MAX4395. LTC1983 provides up to 100 mA, but I cannot find in the other datasheets how much current is required for the ...
0
votes
1answer
63 views

Attiny85 crashes when I run a motor through an L293D

I'm trying to run a motor through an L293D turned on and off by an Attiny85. The Attiny85 has the micronucleus bootloader on it, which is why pin 3 is connected to a pull up resistor. On the Attiny ...
0
votes
0answers
69 views

How can I achieve 5V DC from 230V AC wirelessly? [duplicate]

I want to step down 230VAC so that I can have a large amount of current that I can transmit wirelessly through the transmitter coil to the receiver coil. I want to transmit it across 5millimetres ...
3
votes
0answers
114 views

How can i transfer 12 V, 50 Hz, 1 A wirelessly? [closed]

I want to transfer electical power wirelessly from a transmitter to a receiver coil. Input energy is provided by a single phase step-down transformer - 230V/12V AC, 50 Hz, 1,000 mA. Using the 12 V ...
0
votes
1answer
28 views

Connecting 2 different power supplies in series

I have an ac adapter that outputs 18 volts with a max current of 3 amps. Is it possible that I can connect it with series with an atx power supply's 12 volt out in series to get 30 volts? If so what ...
1
vote
2answers
54 views

Should I add insulation to lithium ion battery

I have purchased a 36v 10ah lithium ion battery for use with an electric bike. I live in rural Australia where it gets very hot in summer and fairly cold in winter. I considered insulating the ...
0
votes
1answer
56 views

Wiring a Logitech extreme 3D pro joystick for Xbox adaptive controller

The joystick only allows direction movement when connected to the Xbox adaptive controller, which doesn’t help when I have 1 hand and 17 buttons to connect. There are only 10 buttons of the joystick ...
0
votes
1answer
40 views

Can you power ac motor in ev with ac generator? [closed]

Can a smaller ev with ac motor be powered by an ac gen instead of using a battery pack and everything that would go along with it? If so, what would the arrangement be going from gen to motor?