Questions tagged [power-supply]
An electronic device which supplies electrical energy to a load. Can be AC or DC input. Typically DC output.
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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 ...
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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 ...
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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 ...
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2answers
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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2answers
32 views
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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 ...
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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?
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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 ...
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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 ...
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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 ...
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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
...
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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?
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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? ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 (...
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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 ...
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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 ...
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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 ...
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2answers
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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 ...
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0answers
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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.
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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.
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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 ...
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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 ...
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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 ...
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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, ...
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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-...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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 ...
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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?
