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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8 views

Changeover relay circuit

I am looking for a circuit for one of mine typical application. I have transformer power supply with 230VAC/DC input with 12V /1A and 5V/500mA output. Now I wanted to introduce another stand by power ...
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1answer
16 views

Low Dropout Regulator Enable Delay

I have a main buck DCDC 5V that feeds to five different LDOs(3.3V). To create power sequencing, I would like to use a resistor and a capacitor at the input of the enable pin of each LDOs and by ...
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1answer
21 views

Effect of electrical arcing on the system voltage

What will be the effect of Electrical arcing (between phases or between phase and neutral) in a 415V three phase system in the downstream voltage... Will it just act as a load ( let's say the arcing ...
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36 views

DC Voltage Regulation - 5vdc output, 12, 24, 48vdc input [on hold]

I am designing a pcb that gets used in 3 different products with 3 different voltage supplies. One uses 12VDC power brick, another 24VDC, another 48VDC. I am working on the new design for this pcb. In ...
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2answers
585 views

Would these components work for a Nixie tube power supply?

recently I have been trying to design a custom nixie tube high voltage power supply. I've come across this youtube video https://youtu.be/kNBPaFiHbt0?t=5m45s, and at 5:45 there is a nice view of the ...
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2answers
102 views

High frequency reduces power on circuit

I am not expert in electronics so there must be many errors that I am not considering. I designed a simple half wave rectifier that gives signal to a LDO voltage regulator of 3V3. In the input I have ...
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3answers
89 views

Can an ESC-rectifier combination be used as a replacement for a buck converter?

I am working on a project that involves a DC-DC power step-down. The details are as follows : Input : 48V , 15A Output : 18V ( around 700W ; due to losses) However, I could not get any buck ...
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0answers
99 views

Help identifying component in SMPS

I have been working on a Schroff/Cherokee Europe PE1947/23B SMPS (circa 2004?) and have had trouble identifying a component within the circuit. This SMPS features the following outputs: +12v DC @ 8A ...
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23 views

Making a redundant power source

I want to have redundant power sources for my load in case one of the sources fail. i have 2 separate dc power sources ( from chargers ) and both is rated 5v 2.a. According to my understanding and ...
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3answers
50 views

amplify/increase current from 9v battery

I have a working circuit that generates a signal (a range of slow and fast tones) and sends them to a speaker. I tried to switch to a piezo driver and speaker and was successful using the MAX9788 as ...
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28 views

Power Supply for automotive Circuit [on hold]

I want to create to my electronic circuit, which contains: An ublox GPS module, an ESP32 module, an angle and temperature sensor, a CAN tranceiver. A stable 3.3v power supply able to withstand bad ...
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2answers
102 views

Voltage doubler and power

Lets consider for instance this voltage doubler: It was told that a practical limit of this circuit is the fact that we cannot absorb too much current from it. But I wanted to verify (if it is true) ...
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28 views

Using a power analyser(and optical light source JW3111) which are connected to a 1550nm fiber bragg grating [on hold]

I have a fiber bragg grating of 1550 nm and an optical light source JW3111 and an optical power meter which is connected to both sides of the FBG. I want to be able to detect the variations of the ...
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71 views

Voltage drop on load

I have designed a circuit to keep the heating element at a constant temperature. The digital part of the circuit is being feed from a 5V LDO which is powered by two 18650 batteries in series and the ...
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3answers
137 views

How does the feedback work in this linear power supply?

How does the feedback loop in this circuit work? Image source I am unfamiliar with this configuration. It seems to have positive feedback.
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46 views

How does this circuit work? Capacitive DC supply from 230VAC - Radiator control board

An electrical house radiator stop heating, so I opened it and start trying to understand how the control board is working. I was very surprised to discover a very very low cost board with a ...
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69 views

Bench power supply dummy load help

I am converting a Corsair VS550 PSU into a bench power supply. DC output is: +3.3V 18A +5V, 18A +12V 42A -12V 0.3A 5V (standby) 2.5A This is a learning process and I have been trying decipher ...
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1answer
375 views

Why ship power distribution systems have no neutral?

What is the reason for this difference between the distribution systems of power companies and the systems implemented at ships?
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1answer
112 views

Mechanical Switch Causes Transients from AC-DC Power Supply

I'm having trouble getting rid of output transients from this Mean Well PSU right after the AC input is switched. https://www.meanwell.com/Upload/PDF/RPS-500/RPS-500-SPEC.PDF The PSU is a RPS-500 ...
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1answer
63 views

Use one 12V 30A timer for two separate 12V inputs?

I'd like to use the following timer, rated 12V 30A, but for switching two different 12V inputs at the same time and not having to buy and program two timers. But the timer only have one channel. One ...
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1answer
57 views

What defines the life of a AC-DC power supply? [on hold]

I want to make a transformerless AC to DC power supply and have found a good circuit design. My question is what components in particular will define the life of the circuit? Is it just the capacitor, ...
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1answer
280 views

What is the correct shunt size for the following ammeter and configuration?

I have the following ammeter: https://www.aliexpress.com/item/Red-led-Display-Color-0-56-Digital-Ammeter-DC-0-100A-4-wires-3-digit-car/1301822575.html The seller recommends 75mV 100A shunt be placed ...
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1answer
623 views

ESD Protection on Un-grounded Chasis

I am designing a product solution which needs a 240V AC to 12V DC. I am getting that done with one of those standard laptop chargers from a reliable OEM(with necessary certifications) which looks like ...
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2answers
63 views

Laying out power electronics on analog signal board, practical advice

to keep this brief I am designing some audio circuitry and also need to design the power supply. The barrel jack in the schematic below sees 18VAC and I am converting that to +/-15V DC rails. So to ...
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31 views

Capacitive Power Supply Torch

I'm an amateur at electronics circuitry and concepts. I have designed a simple capacitive power supply using few web images and brief lessons. I understand that this type of transformerless power ...
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0answers
27 views

Help about MCP73831-2 charger management chip

I designed a circuit with a battery charger using MCP73831-2, this is the circuit i used After testing it for about 4h i ended with a swollen battery My question is what can cause this problem ? and ...
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2answers
121 views

What is the easiest (least complicated) way to emulate a “short” button press that pulls a pin low?

I'm trying out the IP5306 (The datasheet is in Chinese, I used the "document" feature of Google Translate to translate it). Here is my schematic: The IP5306 is a cheap boost chip that is normally ...
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39 views

Replace power tansformer to switching power supply [closed]

I would like to have some guide / help, pros-cons: I prefer linear regulated power supply for lab use due its low noise and low ripple. But I think, I could replace the heavy transformer to a ...
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2answers
96 views

How can I layout these regulators to minimize board size and EMI?

I have three switching regulators. A 12V, 5V(green box), and 48V(purple box). The plan is to supply both regulators through -/+12vout pours. If I am trying to minimize board size while also ...
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1answer
91 views

How to deal with an inconsistent / noisy power signal?

I'm using a 12v power supply to operate a system of sensors that is very sensitive to fluctuations in the voltage input. Unfortunately, I can't control what goes on upstream of my components and this ...
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2answers
110 views

Current draw on the AC input of a PSU

I have a cheap PSU of this sort, used for my 3d printer. It has a 110V input, and a 12V output with 20A maximum current. Unfortunately, it doesn't have detailed specs/data available beyond that. Now, ...
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58 views

Multiple voltage supplies to one IC

I have the TPL5010 functioning as a watchdog to an MCU. I have a 3.7V battery and a 5V voltage regulator on my board. I require the watchdog to be power by both sources and remain unaffected when ...
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1answer
66 views

Is there any hope for this power supply to work on 220V rather than 110V? [closed]

I stupidly moved my laser printer with me overseas without checking whether it would take 220V. I assumed it would be like my desktop computer and accept both. Anyway, here I am with a 110V printer ...
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26 views

Can I damage my laptop by using a different power adapter? [closed]

We have two laptops, one with a 95W(19V~4.75A) power supply and another with 65W(19V~3.42A) power. We discovered that the laptop connectors are the same (or at least compatible - but not USB-C) - ...
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1answer
35 views

Battery with alternative power supply

I have a circuit that can use a 9V battery for power, but also want to alternatively connect to a power supply (usually higher that 9V) without taking out the battery. Is it OK to just connect the ...
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5answers
3k views

Benchtop power supply current limit on MC34063 switched-mode power supply

I'm currently building a power supply using a MC34063 IC. I have used an external n-channel MOSFET for switching the high current used to drive an LED pair. simulate this circuit – Schematic ...
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19 views

Can I use my universal power supply (20V, 4A) to load a Lenovo W541? [duplicate]

Question: I have a universial power adapter from Hama (see image below). Can this load a Lenovo W541, data from Amazon: https://www.amazon.com/135W-Charger-Lenovo-ThinkPad-Laptop/dp/B06XXZKZ2L ...
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2answers
99 views

Power a 12V 30A (instantaneous) load. Possible with 18650 cells?

(novice) Hi, I'm driving a 12V load for ~1s second very infrequently, at a draw of about 30A. The load isn't particularly voltage-sensitive. Total mAh isn't that important. I have a supply of ...
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1answer
177 views

Powering 9216 leds @5V, @24V with converters

I am struggling with a power supply question. I would like to power up and control 9216 LEDs -- strips of 144 LEDs/meter (WWA SK6812 - just like the RGB kind). These are powered at 5V and draw 43.2 ...
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2answers
117 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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1answer
62 views

How to set PSU voltage using Arduino?

I'm trying to build a Linear bench PSU, Here's what I did so far: simulate this circuit – Schematic created using CircuitLab So I'm converting the PWM to voltage using a low pass filter and ...
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2answers
41 views

SMPS controller duty cycle resolution

when reading the datasheet for some SMPS controllers like the lm25116, I can see that they operates around 1MHz, but nowhere we can find their duty cycle resolution: 8bits, 12bits, 16bits ? So I'm ...
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19 views

Gate Current Calculation and Practical Mosfet Selection

Vnoo3 is the drive voltage, and Ig is the gate current. What I am wondering is: 1) How to calculate the peak Ig on the rising edge of the pulsed gate voltage? For instance, using the spice image ...
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2answers
45 views

Split rail DC/DC converter

The input voltage of my system is ±15V. I need to generate the ±5V voltage. As I need it to power precise analog components (ADC, op amps), my plan is to use DC/DC converter for reducing it to, lets ...
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1answer
210 views

Supercap backup power - delayed power on

I'm trying to figure out how to make a backup power that will allow my SBCs to safely power down in case of power outage. What I thought to use are supercaps (2 in series for 5.5V) that will first ...
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2answers
52 views

DC Power Supply maximum current

let's consider a DC power supply of 5V with for instance 1A of maximum output current (i.e. its maximum output power if 5W). Let's connect a load R = 1 Ohm. Ideally a voltage source of 5V will give ...
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3answers
262 views

Is there a practical method to verify whether the noise have CM component in this setup?

An SMPS power supply unit namely Vsupply output can be composed of its desired DC output Vdc, differential mode noise Vdm and common-mode noise Vcm. If we have such a power supply and an earth ...
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1answer
814 views

Question about constant current region and voltage adjustment

first wanna thank anyone who can provide some thoughts on this. My doubt now is this. I'm using some meanwell power supplies and I'm a bit confused about max output they can handle. For an ...
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3answers
16k views

Can I use a coaxial cable as a DC power cable (without using it as a signal cable)?

On my balcony I have a satellite dish and two coaxial cables attached to it. I don't use that dish, and I want to remove it and reuse those coaxial cables to power some other device on the balcony (a ...
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31 views

Suggestions on simulating fuse characteristics electronically?

Assume that we have an isolation transformer 230V in 230V out and that we measure the output current with a current transformer with known transfer function. We compare the current to a settable value ...