Questions tagged [voltage]

Voltage, otherwise known as electrical potential difference (denoted ∆V and measured in volts) is the difference in electric potential between two points (adapted from Wikipedia). Voltage can be constant (DC) or varying (AC).

Filter by
Sorted by
Tagged with
-2 votes
1 answer
55 views

AM single sideband modulator [closed]

I am doing a AM single side band modulator that can help to produce a single sideband from a spectrum analyzer. But now even i had follow the rules to build a modulator, the output still not showing a ...
user avatar
-5 votes
0 answers
26 views

Circuit help needed on converter DC with superimposed higher volts, so as 100 V present with same amps from first source [closed]

I need help to readjust my circuit of 28v negative DC with 6 amp flow out, from DC converter, and hooking in PARALLEL, with with superimposed small 30 watt module, as 100 volts negative DC, so as the ...
user avatar
  • 1
1 vote
2 answers
81 views

What type of regulator to use for LEDs in a scale model vehicle?

I'm building a 3 ft scale model of a Peterbilt truck with high detail to include multiple 3mm colored LEDs. What type of regulator for differing 2 to 3.2 volts can I use? Yellow LEDs 2 - 2.2 volt Red ...
user avatar
0 votes
0 answers
55 views

Wirelessly measuring voltage between two points? [closed]

I would like to measure a voltage between two points, wirelessly, but am stuck on the need to have physical contact between two points to be able to get a voltage reading... So I would like to be able ...
user avatar
0 votes
1 answer
36 views

What does power balance and voltage balance of a circuit tell? How to calculate them? [closed]

What information does power balance and voltage balance of an electrical circuit give about that circuit? What is the general procedure to calculate them? Are there any automated tools in which we ...
user avatar
1 vote
1 answer
14 views

Clock out drive strength - Current

In the datasheet of this IC, what is the benefit or purpose of having 12mA and 16mA drive strength for the clock output pins? What is the purpose of having 2 drive strength values for the clock? Is it ...
user avatar
  • 2,194
0 votes
0 answers
36 views

Ethernet Controller - Signals

I was going through the datasheet of this Ethernet controller IC. I see that the pins are different than that of a Normal Ethernet PHY. Usually PHY has Ethernet Tx and Rx signals and has the MII/RMII ...
user avatar
  • 2,194
0 votes
1 answer
50 views

Why is electrical stress higher on the insulator string near the transmission conductor? [closed]

From my observations, it is because of the electric field around the conductor. As we go far from the conductor, the electric field starts decrease. That is why there is also unequal voltage ...
user avatar
0 votes
1 answer
36 views

Meaning of Speed and Duplex pin in the IC

In this - Link of the datasheet, can someone tell me what is the meaning/purpose of the DUPLEX Pin and the SPEED pin. Unable to understand what it actually does and what does it indicate?
user avatar
  • 2,194
0 votes
2 answers
34 views

How to find the maximum power dissipation or Thermal resistance (J-A)

In this datasheet - Link there is no value of maximum power dissipation or junction to ambient thermal resistance. In this case, how to find the value of it?
user avatar
  • 2,194
0 votes
0 answers
30 views

Groundwater pump star-delta phase voltage confusion

Last time I got good answers for my question here so I came again today. Thanks. 🙏🙏 The problem am facing today is in star delta starting motor. When I connect motor to contactor, in phase to ground ...
user avatar
-1 votes
1 answer
81 views

I've designed a new style of ac alternator where both the stator and the rotor rotate oppsite directions so that rpms multiply by each other [closed]

My body of information is on a youtube video of nothing more than a hand drawn picture. In explanation of my actions I did this to publish to establish prior art. What I'm curious to know even if its ...
user avatar
-1 votes
0 answers
34 views

Meaning of Virtual PHY, Managed Ethernet [closed]

Can someone tell me what is the meaning of "Virtual PHY", "Managed Ethernet Switch" & "switch fabric". Unable to get a good clarity on what terms actually mean in the ...
user avatar
  • 2,194
0 votes
1 answer
36 views

What is support for an end-to-end and peer-to-peer transparent clock?

In the datasheet of LAN9353, the description states that it supports "supports end-to-end and peer-to-peer transparent clocks" Can someone tell me what is the meaning of this?
user avatar
  • 2,194
0 votes
0 answers
26 views

What is the standard common mode voltage of Media Dependent Interface MDI[0:3]± signals?

I am working on the selection RJ45 connector for MDI interface between PHY and the link-partner. I am planning to use this PHY for my SGMII interface application. From various online readings, I ...
user avatar
  • 307
0 votes
0 answers
40 views

Constant Voltage / Constant Current / Current Foldback Regulator Evaluation

I am a semi-retired EE in electrical distribution, so op-amps are not in my tool bag, and I could use some help. It has been over 30years since I last worked with them, and I need help from someone ...
user avatar
3 votes
5 answers
1k views

Are smartphone cells actually charged with 9V using QC and other techniques or does the smartphone always step down the voltage?

I'm having this disagreement with a good friend of mine regarding charging voltage of the cells inside modern smartphones when quick charge, USB PPS and other techniques are used. Let's take as an ...
user avatar
  • 33
0 votes
1 answer
63 views

How to calculate frequency of an AC source with variable frequency using Arduino

I have an AC current source. Its properties are Maximum Vrms=15v Maximum Frequency 125 Hz Minimum Frequency 5 Hz The current source is pickup coil of a motorcycle... Vrms range is approximately 0.7v-...
user avatar
0 votes
2 answers
59 views

Will a resistor reduce voltage without current flow?

I asked a question where I was trying to figure out how my truck controls the speed of its blower motor. This answer provided the following diagram showing that it uses a set of resistors in series to ...
user avatar
  • 127
0 votes
0 answers
26 views

Voltage Drop Formula for Three Phase Power Systems

I've just started learning about electricity and power systems, and am currently learning about calculating voltage drop for three phase power systems. The book I am reading is explaining how to ...
user avatar
1 vote
1 answer
36 views

Finding the "drop in potential" as current moves through a single resistor of a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
user avatar
  • 1,201
0 votes
1 answer
39 views

Transformer ratio of a transformer that connects a generator to a MV grid?

Inside my one-line diagram in which I am studying some properties of the medium voltage grid, I want to connect a generator to the MV busbar to study the hosting capacity. Therefore there is not a ...
user avatar
1 vote
2 answers
44 views

Finding the voltage available at the terminals of the battery in a circuit with parallel resistors

I have four different resistors connected in parallel to a \$24.0 \ \text{V}\$ battery with internal resistance of \$0.500 \ \Omega\$. The resistor values are \$10.0 \ \Omega\$,\$15.0 \ \Omega\$, \$30....
user avatar
  • 1,201
3 votes
2 answers
111 views

Circuit that switches on at 4V and off at 3V

I'm new to circuit design so please forgive any misstatements. I'm wanting to create a circuit that turns on a device (mini water pump) when a voltage hits 4V or higher and turns off the same device ...
user avatar
1 vote
1 answer
52 views

Graphing modes of BJT

Suppose we have this Ic vs Vce graph of a BJT transistor I have been taught this graph is applicable for this BJT transistor configuration. simulate this circuit – Schematic created using ...
user avatar
0 votes
1 answer
58 views

Calculating the reading on ammeter \$A_1\$: why am I incorrect?

I have the following circuit: The voltmeter \$V_1\$ measures the voltage drop across the \$9.00 \ \Omega\$ resistor and has a reading of \$4.50 \ \text{V}\$. I am trying to calculate the reading on ...
user avatar
  • 1,201
2 votes
3 answers
120 views

Voltage is below 380

I am Vango from Ethiopia. Am junior electrical engineer. While working today I've faced some problem. That is when incoming voltage drops below 380 V, I mean when it is about 370 V, motor stops ...
user avatar
0 votes
0 answers
18 views

Normal Switch and LAN9353

I am reading about the different types of LAN Switches. And I came across the LAN9353 device - Link I want to understand the difference between a normal Gigabit Ethernet 3 port switch and this LAN9353 ...
user avatar
  • 2,194
0 votes
0 answers
44 views

External Interrupt Peripheral Microcontroller

I'm using this ATSAME53N20A-AU microcontroller - Link I'd like to know what does the EIC and EXTINT peripherals would do? So, I went through the Appnotes - EXTINT and EIC I just want to know whether ...
user avatar
  • 2,194
1 vote
2 answers
58 views

Ai Thinker ESP32-CAM max input voltage

What is the maximum input voltage on the Ai-Thinker ESP32-CAM? I'm asking because the official docs specify a max input voltage of 5.25V, however it has an AMS1117 power regulator which has a maximum ...
user avatar
0 votes
0 answers
14 views

Extending 20AWG of Ikea VAXMYRA, What to look out for [migrated]

I am looking to extend the current wire of Ikea VAXMYRA led light. From the wire there's printing of AWM 2468 20AWG 80oC 300V. Can I literally just purchase another 20 AWG cable and splice it? Please ...
user avatar
0 votes
1 answer
83 views

The source part of an IRF540N transistor

So, I have built a DC-DC booster using an IRF540N as my transistor, according to the following schematic diagram. It did work and I had a 18V output from a 1.5V battery. The transistor is connected ...
user avatar
-2 votes
2 answers
74 views

How to use resistors to lower voltage? [closed]

I want to use a resistor to lower 3V to 1.8V but I'm not sure which one to use. How do I decide which one I should use?
user avatar
0 votes
1 answer
58 views

Designing a system with desired transfer function

Suppose we have a transfer function H(s) = 1/s+1. Is there a general method by which using electric components we can construct such a system?
user avatar
0 votes
0 answers
47 views

USB-A 12V Output?

I am very confused by PowerBanks. We bought some power banks and I can read this on the back: It seems the power bank can output 12V through the USB cable. Is that true?
user avatar
  • 345
1 vote
1 answer
37 views

What are relationship between cable properties and electrical properties?

I was prototyping esp32-cam (microcontroller aka MCU) on breadboard, I saw brownout error message on serial monitor everytime I initialize WiFi then it keeps restarting. After I google for 24 hours ...
user avatar
0 votes
1 answer
52 views

In this formula, where does T come from to the power of 3 divided by 2?

I read the tutorial that says Also, as T → 0, so do T^3/2 but i did not understand this argument. In this formula, where does T come from to the power of 3 divided ...
user avatar
  • 75
2 votes
2 answers
271 views

Why does the Arduino give me a value of 1023?

I'm using an EMG sensor V3 from Advancer Technologies connected to the A0 pin of an Arduino Uno 3. When I read data from the sensor it always shows 1023 values. What is the reason for this? I used a ...
user avatar
1 vote
5 answers
207 views

If two devices both require 12V 2A power can I use a 12V 4A power supply to power them both?

The question title says it all really: I have two devices that both require a 12V 2A power supply, so I'm assuming that I can I just use a single 12V 4A power supply to power them both? I'm also ...
user avatar
0 votes
0 answers
4 views

Lava lamp UK to CANADA [migrated]

I've recently buy a lava lamp and it only works for EU, all of it is 220-240V. First I've buy the plug adapter (not converter for V) the light bulb is 240V R39 E14 30W, and it doesn't exist in 120V, ...
user avatar
7 votes
2 answers
275 views

I need to generate a +200V polarization voltage (Stable, low noise, micro-amp output)

Ever play with high end condenser microphones? Like the ones used in test facilities for vehicles, and other stuff? Well I do and it's not a cheap hobby, I have taken care of all the other issues (...
user avatar
0 votes
2 answers
47 views

Pin Buffer Types

I'm going through the datasheet of this PHY Transceiver LAN8742A On table 2.2, it is mentioned as buffer types. I see a row called as O12, which stands for Output 12mA sink or Output 12mA source. My ...
user avatar
  • 2,194
0 votes
4 answers
64 views

Need to produce regulated 5V from a source that ranges 3.7 - 6VDC

I'm building a device that will be solar powered and uses a microcontroller requiring 5VDC. The solar charger emits anything from 3.7V (from it's Li-ion battery) up to 6.0 V (raw output from the ...
user avatar
  • 101
0 votes
3 answers
101 views

Resistance measured individually vs measured on PCB

I always wanted to ask this question. Suppose I have a 1kohm resistor. I measure its resistance by connection a multimeter to both of its terminals (when it is not connected to any part of a circuit.) ...
user avatar
  • 2,194
0 votes
0 answers
29 views

Where To Connect Wires on Pin Out

I am very inexperienced in wiring. Where do I connect the wires from my trans-impedance amplifier to my DAQ to measure the voltage out and also to apply a voltage. I don't understand why there are ...
user avatar
0 votes
1 answer
46 views

Can I have more voltage but ok wattage on a led strip? [duplicate]

I have 1.2 meters of a 12V 14.4 W/M LED strip, I also have a 64V power supply with 300mA, a.k.a an 18W power supply. My question is if the 64V could damage the 12V strip even though amperage is low ...
user avatar
0 votes
1 answer
55 views

Single buck converter for multiple fans with different speeds?

I need to switch a 3d printer motherboard which controls some fans, the new one outputs 24V instead of 5V, but each fan is 5V. Each fan will need to be spun up/down independently from the other two. I ...
user avatar
  • 113
2 votes
1 answer
34 views

Same part devices supporting different temperature ranges

I just had this question. We often come across microcontrollers having the same internal peripherals and supporting the same functions but supporting different temperature ranges. Can you tell me how ...
user avatar
  • 2,194
0 votes
1 answer
47 views

Parallel RLC Circuit with DC voltage source input

I am new to LTSpice and I am trying to simulate an RLC parallel circuit with a DC source. The ideal switch is initially open and then closed at t=0+. The input is an ideal DC source with 1V. I have a ...
user avatar
  • 67
1 vote
4 answers
361 views

Can I replace an LM741 op amp with an AD620 op amp in my circuit? [closed]

I have a voltage comparator circuit (shown below.) Can I replace the opamp with an AD620 op amp? My lab has mostly AD620 op amps.
user avatar
  • 27

1
2 3 4 5
141