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Questions tagged [power]

Electric power is the rate at which electrical energy is transferred by an electric circuit. The SI unit of power is the watt (one joule per second). Use this tag where power is a primary concern for the design under discussion. Use the "low-power" tag when that applies.

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How to add 40 ms delay after 3.3 VDC rail is ON?

What's the simplest method to add a precision 40 ms delay to a 3.3 V rail?
Ariel Narboada's user avatar
2 votes
4 answers
618 views

Is a shunt jumper for a power plane jumper a good idea?

I am designing an experimental PCB. I have included a split rail DC/DC converter LM27762 on it. Since I wasn't sure it will work, for testing purposes I have included a 2x3 pin header for bridging the ...
NoisyPCB's user avatar
-1 votes
1 answer
26 views

Power Integrations Spice Model [closed]

Does anyone have something close to a PI switcher spice model for flypack converter? I'm not sure if this is the place to ask or if there's a better site.
jkont's user avatar
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2 answers
110 views

Caps vs. no caps = the same noise?

This is a setup with an ESP32-C3 and HX711. In this oscilloscope reading, there is a 10 μF cap and a 0.1 μF cap across the VCC and GND of the HX711 (it makes the load cell readings more stable). In ...
wyc's user avatar
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1 answer
74 views

RF jammer module power measurement using a spectrum analyzer

I have an RF jammer module that works at 2390-2510 MHz. The voltage is 24-28 V and it can transmit up to 50 W. When I use a spectrum analyzer, the value is around -20 dBm. If I'm not mistaken, -20 ...
Raihan Anwar's user avatar
0 votes
2 answers
94 views

Best method to dampen inductive spiking from pulsing coil with MOSFET?

A simple diode works across the coil to lower the voltage spikes, but I ideally need a way to absorb the inductive spiking as fast as possible. I've heard a Zener diode across the drain and source of ...
Justin Osgood's user avatar
0 votes
1 answer
64 views

Replace this USB power board [closed]

I have broken this board, its for USB powered lamp. I presume it is a power conditioner for usb power... As its before the light color/control board. Im not sure if it was USB or USB C - I presume its ...
Wan33's user avatar
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1 answer
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Using Microchip Technology MCP39F521 (I²C Power Monitor) with 240V

In the sample schematic Microchip Technology supplies in the data sheet for their MCP39F521 shown below, it appears that V1- is grounded. (V1- and V1+ are input pins for determining voltage.) Does ...
Eric Lindsey's user avatar
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2 answers
51 views

capacitive filtering of power line transients without power loss

I've been researching so-called "surge capacitors", which are claimed to augment surge protection devices (SPDs). The claim is that SPDs usually have at least a 5-10 ns response time, and ...
Special Sauce's user avatar
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1 answer
52 views

Can I mix 5v power sources? how about 24v power sources?

Hello and thank you in advance for pointing me in the right direction. I finally started designing my own PCBs. If I set up a PCB with a 110 to 5v power source (HLK-PM01), could I then add another 5v ...
Cancun Manny's user avatar
1 vote
1 answer
35 views

PoE power extractions using RT9400

I want to get power using RT9400. The thing is I have schematics for RT9400 connections diagram in which they used magnetic transformer. My question is can I directly use RT9400 with PoE connector to ...
Ali Hamza Malik's user avatar
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3 answers
69 views

Powering a device from the RS485 lines

I have found multiple RS232 to RS485 converter dongles (from different brands, models, and makes) that do not need external power to operate. Connect the RS232 DB9 on one side, and three wires for the ...
Steven Smethurst's user avatar
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0 answers
46 views

Help identifying the component labeled IC1 [closed]

I have a problem with one power supply. It is a power supply for a pool cleaning robot, model 9995677, output 30VDC 220W, PCB number HGP-D6803.DB.PCB. The power supply was causing the fuse to blow ...
Lazr's user avatar
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1 vote
2 answers
122 views

How to isolate RS485 (A and B) from existing transceiver? Check attached circuit diagram, is it correct?

I have a controller with an RS485 transceiver, specifically the IS8489EIBZ-T, which is not isolated. I want to connect a BMS system to the output of this transceiver. After some research, I found a ...
mechaTronics Tech's user avatar
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0 answers
51 views

Options after breaking USB-C jack off of PCB

Hello! Snapped the USB-C jack off of my Logitech MX Keys. I have a background in computer engineering and some experience doing board-level repairs. I do have an SMD hotplate, multiple soldering ...
Mikey's user avatar
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1 vote
1 answer
93 views

How to find the power factor of a component when the combined power factor and one other power factor is known? [closed]

Problem: A 2000 volt-ampere with a power factor of 0.8 lagging is combined with 500 volt-amperes of synchronous motors. If the overall power factor is 0.9 lagging, find the power factor of the ...
tryingtobeastoic's user avatar
0 votes
2 answers
74 views

Efficient Padding for UART to Minimize Power Consumption

So, I am implementing a custom protocol over UART (data field in the packet is fixed at 8 bytes + contains a len field). If the data len is less than 8 bytes, 0xFF is being used for padding. I ...
dsoham's user avatar
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0 votes
0 answers
41 views

How can I determine how much power is in a frequency range via FFT in LTspice?

When using LTspice, I can see the FFT of a voltage. How can I see how much power is in a particular frequency band, and what portion of the total power it is? The FFT in LTspice is in dB, but it's ...
SRobertJames's user avatar
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1 answer
36 views

Negative active power readings?

I am using a Fluke 434 Power Quality Analyser on a balanced load, on the supply side of a CNC machine. I am acquiring active, reactive & apparent power, see graph below. Would I be right to say ...
DrBwts's user avatar
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0 votes
2 answers
46 views

Switching the circuit ON and OFF using 50mA rated push button latching switch

I need some help. I want to power the circuit ON and OFF using a 50mA latching push button. The idea I came up with was to use the En pin of the boost converter. I am using it to turn the boost ON and ...
Tahoor Asim's user avatar
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0 answers
20 views

OBD2 Pwr+Gnd causes poor GPS reception in device plugged into it, looking for causes & solutions

Myself and a few others have built a custom device (PCB & components) which is designed to run while plugged into an OBD2 connector in a vehicle and capture GPS location data and transmit it via ...
bgp's user avatar
  • 273
0 votes
2 answers
35 views

Using 5-in-1 dimmable power supply with PWM dimmer for LED strip

I hope my question is not too basic. I'm confused as to how I am supposed to connect a PWM 24V dimmer with my 24V 5-in-1 dimmable power supply. The 5-in-1 has AC inputs (neutral and load), LED- and ...
Marc-André Lafortune's user avatar
0 votes
4 answers
137 views

Overloading wirewound resistors

I need to add some wirewound resistor in series with a voltmeter to make it high range. I am converting the voltmeter from 300 V FSD to 900 V FSD. As per my calculation the wattage should be 20 W, but ...
Ashok Das's user avatar
  • 337
0 votes
1 answer
42 views

What should I do when clearance boundaries overlap with SMD pins?

I am brand new to layout design. I am using the TPS62136RGXR buck converter in my design. However, according to the attached image, the pin's clearance boundaries (0.2mm according to JLCPCB's assembly ...
NickRand's user avatar
2 votes
1 answer
38 views

Recommended way of power switching external modules & peripherals

I recently designed a PCB that is battery powered. Ideally I want this to be a low powered device, and as such have endeavoured to implement controls and systems to decrease power consumption. My MCU ...
Explorex's user avatar
  • 408
0 votes
2 answers
55 views

Why Does Current Flow Through the Neutral in a Wye Transformer Secondary?

I'm trying to understand the behavior of current in the neutral wire of a wye (Y) transformer secondary (EU residential wiring). Specifically, I'm curious about the following points: Does the current ...
A R's user avatar
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3 votes
3 answers
155 views

What happens when you insert an inductor between Vcc and a MOSFET's drain?

Inserting an inductor in between Vcc and a MOSFET's drains can cause some very large voltage spikes, depending on the exact inductor value: I'm having trouble analyzing it properly, though. For some ...
SRobertJames's user avatar
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0 votes
0 answers
31 views

Help needed for verifying 3.3 V wireless charging schematic with LIR927 battery

I am currently working on a small electronics project for my swimming club and could use some advice. Forgive me if this is basic, I'm really new to electronics. I am working on a wireless charging ...
Sean O'Sullivan's user avatar
0 votes
1 answer
36 views

Arduino and Pololu Motor Driver Shield Undervoltage Issue When Driving Relay and Motor Pump

Problem: Arduino Relay Shuts Off When Motor Driver Turns on to Actuate Motor/Pump. Hello! This is my first post, so pardon if my question lacks structure or etiquette. I will try to provide as much ...
Nathan Nguyen's user avatar
0 votes
0 answers
56 views

Power supply issues for poor man's SONOFF

So I have zero electronics education. I've created some devices just following YouTube videos and what I call a bit of common sense. Long story, but basically found that I could purchase D1 Mini's (...
Cancun Manny's user avatar
-3 votes
1 answer
86 views

How a car inverter can diffuse 16 A 230 V if the input is a 12 V car battery? [closed]

I have found this car inverter We say that the power is kept between the input and the output of an inverter like in this thread, so if the voltage in the output is higher and stepped up, the current ...
John Mary's user avatar
1 vote
2 answers
108 views

How do I modulate the output power of a laser diode at 1 kHz? [closed]

I am planning to use L785P5 laser diode from Thorlabs, which has a maximum output power of 5 mW. As per my requirement, I need power output in the range of 0-100 µW. So how do I go about reducing the ...
solitude_surfer's user avatar
1 vote
1 answer
56 views

How to determine the correct direction of the transformer winding (photo)

I'm winding a transformer for a DAB converter. Image link (MDPI - A DAB Converter with Common-Point-Connected Winding Transformers Suitable for a Single-Phase 5-Level SST System): https://www.mdpi....
Delta's user avatar
  • 535
0 votes
1 answer
77 views

Yokogawa WT3000 don't boot

I have a Yokogawa WT3000 Power Analyzer which I was using with no problems and then I turned it off to take a break. An hour later, I tried to turn it on and I notice that it shows nothing on the ...
Franco Fischer's user avatar
0 votes
0 answers
44 views

Homemade Darlington for NEMA 23 motor

I'm demonstrating the recycling of e-waste to my local community by mining and recycling parts from entertainment equipment found in thrift stores. As such, PNP transistors are very hard to come by. I ...
eternalsquire's user avatar
0 votes
3 answers
110 views

Why in a inverter DC to AC 12V et 220V when I increase the voltage, the current decrease to keep the same power? [closed]

There is a connection between current and voltage. Amps (A) is voltage (V) divided by resistance (R): A = V/R And yes, the more voltage, and thus the more current it draws in an electric component, ...
Moreless's user avatar
-1 votes
2 answers
97 views

Which one will turn the ceiling fan faster? Current, voltage, or power? [duplicate]

Which one of these things will turn faster the ceiling fan? Is it the amount of electrons by unit of time passing through the engine, so is it current? Is it voltage, or is it the two that makes the ...
Moreless's user avatar
2 votes
2 answers
195 views

Calculating junction-to-ambient temperature rise for switching MOSFET

So I'm looking at datasheet's since I'm looking for a N-Channel MOSFET for a DC-DC Buck Converter that will be switching at 1.2MHz. Since the MOSFET will be used as a switch for the Buck Converter, I ...
J. Street's user avatar
0 votes
0 answers
39 views

How to measure power supplied by H-bridge inverter?

System description: H-bridge network of IGBTs (inverter) is used to supply power to a parallel LC circuit connected through matching inductor. It is desired to measure and regulate the power supplied ...
AR2020's user avatar
  • 76
0 votes
0 answers
63 views

ADP5304 - circuit schematics on the datasheet not working

I've implemented the ADP5304, marking "LT9 #IT" in one of my PCB designs however it is not working as intended. The VIN input is the typical 5V DC from a USB port, labeled VIN on the circuit ...
Miguel Tomás's user avatar
1 vote
2 answers
73 views

Which component is likely raising the temperature measurement on my BME680 sensor board?

I have integrated a BME680 temperature, pressure and humidity sensor on a PCB with NL27WZ17 Schmitt triggers (U3 & U4), a RT9193-33GB LDO regulator (U1) and a CM1224-04SO ESD diode (D2). I also ...
Tommy95's user avatar
  • 179
1 vote
2 answers
112 views

How do transmission lines carry low current but high voltage? [closed]

In the image below, you can see the transmission line connected to transformers and current and voltage is transferred from the generating power station at P=IV. Lowering the dissipation of heat or ...
ThreadBucks's user avatar
7 votes
3 answers
356 views

Maximum Power Transfer Theorem Question

I'm missing something here. The maximum power transfer theorem states that max power transfer from source to load happens when source impedance matches load impedance. In the case of a 10V source ...
John Turner's user avatar
1 vote
1 answer
52 views

Finding power rating of stepper motor used as generator

I have a stepper motor that I want to use as a generator for a micro wind turbine project, and I need to know how much power it can generate. The stepper motor is a 57BYGH420 for Wantai Motor, and it ...
leheim's user avatar
  • 21
0 votes
3 answers
70 views

How I can calculate/estimate how many voltamperes I need for an isolation transformer?

I need to power an ungrounded device with live chassis. According to my Google fu I can protect myself using an isolation transformer: https://www.youtube.com/watch?v=3rvEdHyAd2k. Of course I am not ...
Dimitrios Desyllas's user avatar
-1 votes
1 answer
52 views

I keep getting error in Proteus. The project is a dual power supply [closed]

...
Adejire Adegite's user avatar
2 votes
2 answers
305 views

Is there anyway to estimate the time average power without knowing the power factor?

I am driving a transducer with a function generator connected to an amplifier. I need to work out the time average power entering the transducer for safety reasons. I understand it can be calculated ...
UltrasoundNeuro's user avatar
3 votes
1 answer
99 views

How to digitally detect resonance in induction heater circuit?

System description: H-bridge network of IGBTs (inverter) is used to supply power to a parallel LC circuit connected through matching inductor. It is desired to drive the parallel LC circuit in ...
AR2020's user avatar
  • 76
1 vote
1 answer
73 views

How large would my heatsink need to be for the IRLB4132 at 12.6 V and 60 A

I'm building a power distribution board (PDB) for my drone, which is powering 4 ESCs and an Arduino 33 BLE Sense Rev2. I’m using a 3s LiPo battery which provides 12.6V at max charge. My ESCs are rated ...
YANNTASTIC5915's user avatar
1 vote
0 answers
58 views

Is there a DC voltage on a transmitter power amplifier's output?

When studying the answers to Are my power calculations on this MOSFET Power Amplifier accurate? , I noticed this contradiction: If you integrate V * A, you get ...
SRobertJames's user avatar
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