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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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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
66 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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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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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?
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1answer
47 views

What happens when a Cap fails?

I am trying to understand What happens when the Electrolytic caps fail at the input terminal of a charger? What about at the output of the bridge rectifier? These two caps below are rated 100uF @ 200V....
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1answer
69 views

LTC4418 interfacing VALID1 with a microcontroller

I want to use LTC4418 fuctionality of detecting which one of power supplies is on at this moment. Here is my approach to it: PS_VALID1 is connected directly to VALID1 of LTC4418 (without any ...
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1answer
28 views

Wiring sets of 2, 15" LED strips to illuminated switch. 12 sets total — to power supply

Ok, Hoping you guys can help me. I have a screen printing machine for printing t-shirts. The machine has 12 arms that extend out from the center. Under each of these arms I want to put 2 15" white LED ...
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0answers
24 views

Micro-controller 3.3v power supply from 115v/230v AC

I'd like to build a power supply for a micro-controller - likely 3.3VDC using 'household' current (ideally same design for either 115VAC or 230VAC). From a safety standpoint, I'd like to come up with ...
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1answer
129 views

500v generation with 24V, request for current limitation

I am generating 500V from a 24V source. Attaching schematics. This circuit is generating stable 500V. I am attaching a load of 7 kohm. In the schematics the buck regulator is supplying 19V to the ...
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1answer
81 views

What is limiting this board to providing 75w [closed]

https://www.aliexpress.com/item/PCI-E-to-MXM3-0-Graphics-Card-Raiser-Riser-Card-PCI-Express-X1-to-MXM-3/32953407346.html?spm=a2g0s.9042311.0.0.7c5c4c4deWJgEZ the product above is a pcie to mxm ...
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1answer
46 views

suggest a current booster circuit DC-DC 1uA to 3mA

I have a source of power which can provide up to 1.2uA at 1.5 V DC, however, I would like to power a circuit which uses 3 mA at 0.6 V DC. What would be the easiest way to do this? Is this even ...
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1answer
49 views

What is the most efficient way to increase the frequency of a waveform?

More specifically, I have an electric induction kettle. From what I understand, it heats the water by sending a high frequency (voltage?) signal around ~24kHz. This high frequency signal causes a ...
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2answers
109 views

Removing noise induced by IC (Ground loop?)

I want to build a simple, portable, MP3 decoder + amplifier. I use a PAM8610 amplifier and a generic MP3/bluetooth decoder. When I power each of them from separate batteries (7.4V) it works nicely. ...
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0answers
62 views

500v generation with 24V

I want to generate 500V @100mA from a source of 24V @2.4A. My question is that would it be possible to maintain this current? Any clues please.
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31 views

Building a PSU / LM2576

I´m trying to build a PSU with two output voltages ~1x14v 3A & ~1x5v 0,5A here is my diagram: I´m now a bit confused with how much current should my transformer deliver and how the LM2576 works....
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1answer
84 views

Multiple power supply potentials

I am making a Project with an Arduino driving a stepper motor with a driver board. USB will still be connected to send commands over serial. EDIT: I am building an EggBot driver board for my Arduino ...
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1answer
72 views

How do I connect an LED with floating DC voltage?

I want to connected an LED at the output of 500V DC. This DC power supply is made by 3phase DC rectifier and is floating. I would like to have a display on the front panel of the supply which will ...
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2answers
34 views

Use of the same transformer with a replacement offline SMPS controller?

We have an SMPS that was designed by a third party. The controller, VIPER100, has gone obsolete. ST don't do any sort of direct replacement, but other manufacturers do similar devices or at least ...
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60 views

Microgrids in Alaska

I was looking to survey some microgrids and I couldn't get the following information. Are the microgrids commissioned in Alaska DC, AC or a hybrid topology? And is the transmission system used just ...
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1answer
85 views

3.7V to 5V step up not providing enough current

I'm trying to power up a circuit that consists of an Arduino Nano, 3x 3W stereo audio amplifiers (PAM8403), an audio player module and 20x RGB LEDs. The power source is a lithium battery 3.7V 500mAh. ...
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1answer
61 views

How to select current for power supply? [duplicate]

I've two step motors with 12V-0.4A each, A4988 as stepper motor driver and CNC shield on Arduino. As I know I should use at least 2x voltage for stepper motors and I would like to know, if I use 24V-4....
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2answers
47 views

What determines if a battery is charging or discharging in a circuit?

I have a basic understanding of DC circuits from high school and university physics courses, but those courses only covered circuits that discharge batteries. I'm trying to build an rudimentary ...
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1answer
88 views

Why is this power supply split?

I am looking at a schematic for the Pixhawk 2 board. It has a complex power distribution system (see photo below) Much of the complexity exists for one of two reasons redundancy shutting off ...
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1answer
85 views

5 volt power supply directly from 120 volt

I would like to use a microcontroller to drive a TRIAC (Z0103MA0,412). The TRIAC will be switching a 120 volt a/c resistive load. I would like to derive a 3 volt or 5 volt CD power supply directly ...
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83 views

When to use Inductors and what size?

I am building this basic linear power supply as I am new to constructing one from scratch. I know the dangers of AC voltage and transformers. I would like to know the purpose of the round inductors on ...
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1answer
40 views

External VCC for USB cable while keeping data connection

I want to connect my android phone and arduino to create a fast and reliable serial connection. I've read that it is possible with USB OTG but i will need to charge my phone eventually. So i was ...
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3answers
60 views

Connecting transformers in parallel.Will this be a problem?

I am creating a power supply as a small project. I am planning on using two transformers (in parallel) to create a positive rail and a negative rail. Will this cause a problem ? I have researched ...
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1answer
124 views

AC mains rectifier issue

I built a simple full bridge rectifier with AC Mains input, but I noticed that: When the input is 220 V rms the DC output is only 293 V, but I expected the DC output voltage to be 220 x sqrt(2) = ...
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1answer
35 views

Can I use a power supply to power a solenoid electromagnet?

I've got several unused coils of 14 gauge wire that have ferrite iron cores cut to the length of their spools. They have maximum current power transmission ratings of ~5.9A, and according to a ...
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1answer
64 views

Source of 5v power on a typical motherboard

Forgive me for asking an interdisciplinary question. I need to get more 5v power out of a desktop power supply to power a bunch of peripherals. These supplies can go as high as 1600w but the power ...
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1answer
48 views

CNC Shield V3 and step motor controls

I'm trying to build a laser engraver/cnc router with Arduino Uno, CNC Shield v3, A4988 step motor drivers. I'm newbie about electronics and Arduino so sorry if I'm asking non-sense things. I've ...
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1answer
29 views

240v dc connected to 24v dc battery bank

1.I connected my 3 phase ac pma generator/hydro turbine to a 600vdc rectifier. As I opened the water nozzles the generator produced from 38vDC to 213vDC.How do I connect to my 24vDC battery bank ...
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2answers
44 views

Maximum safe amperage for LED Strips

A lot of online resources never question the use of high amperage power supplies for powering LED Strips. As an example, 5 meters of low density (30 LEDs per m) WS2812B strips already use ...
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1answer
68 views

Why does my Android phone charger cause my (powered-off) stereo receiver to make a high-pitched chirping sound when plugged into the same powerstrip? [closed]

After days of scouring my apartment, wondering if I’d developed another pitch of tinnitus, trying to figure out what the hell was making that infernal noise, I finally isolated it to this. Onkyo ...
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0answers
40 views

12v power supply not putting out right voltage

Built a 12v power supply for music project. The "music from outer space" bipolar design, and my modules connected aint been working right. Tested the power output with multimeter and got 10v with a 1 ...
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4answers
134 views

Detect 230 volt main supply in a cheap and easy way

I need to detect by if one o more pumps are really connected to the 230 Volt main supply. Each pumps is activated by means of a triac isolated by a MOC3021. Arduino commands the optoisolators and I ...
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1answer
57 views

Linear voltage regulator output capacitance limit

I am in doubt about selecting the value of bulk capacitors for my system. I am going to use LP5907 voltage regulator. According to the datasheet, the maximum output capacitance is 10uF. Does it mean ...
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2answers
66 views

Problem in IR2112 use

What is wrong in this connection diagram. I had provided pwm with 20kHz and 5volts. But at the R3 I am not getting results
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1answer
68 views

Minimum Effort to Run a 1100W Hot Air Brush from America to Japan?

I'm entertaining an idea of making a small power supply to get a certain hot air brush (For hair styling) to function on the Japanese power grid. I like this hot air brush that runs only on 120V/60Hz ...
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1answer
55 views

Can I use a 5v xtal osc with a 3v MCU? Will a simple npn buffer work? [duplicate]

I have several crystal oscillator cans that run on 5v. I have a PIC24HJ128 on a breadboard. The PIC uses 3v. I want to use a simple npn transistor to buffer the osc out into the CLK in. Will this work?...
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1answer
69 views

Request info on 12/48v PSU

I've got a power supply unit from a defunct/decommissioned Satellite Internet setup, and I'm hoping to get clarification on some of the markings on the label. In the following picture, there's four ...
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2answers
62 views

3.3v Powersupply

I have been needing a 3.3 volt power supply that can use at least 12-24 volts ac dc in. I have looked online and managed to make this schematic but I have no idea if it works. I was hoping if you ...
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2answers
57 views

On a 3-terminal bench power supply (+, -, GND), are there positive and negative drivers behind each of the terminals?

In a 3-terminal power supply like this, are there individual regulators behind the positive and negative terminals? For example a LM317 on the positive and a LM337 on the negative? If not, what kind ...