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
-3
votes
0answers
58 views

How to detect if a light bulb is burned out or blown or failed in Arduino [closed]

I have got an assignment to do by my interviewer in Tinkercad where on click of button bulb has to glow if the bulb is failed/blown/burnt then a mini led near button must blink else if bulb is working ...
0
votes
0answers
39 views

What is the derivation of this formula of potential difference related to the capacitance of a two wire line?

From this lesson: https://circuitglobe.com/capacitance-of-transmission-line.html Basically, I don't get where the formula came from. I am aware of the V = Q / C but I'm not that familiar with ...
0
votes
1answer
38 views

Voltage drop with 2 LM317 in parallel/different output voltages

I believe it might be a silly question but I'm not 100% sure about this, so I would like your opinion: There are 2 LM317, both connected in parallel from the same source and they output respectively 5....
0
votes
1answer
40 views

Can I power a nodeMCU using 3.7 battery

I have a nodeMCU board (3.3V) and a li-ion battery with 3.7 V. Is it alright to give the power supply from that battery?
0
votes
2answers
87 views

Why does my old stepper motor generate a spark when connected to 1.5V batteries?

I stripped an old Epson scanner and found a 4 wire stepper motor inside (EM-489 from Minebea.) I decided to play around a little bit with it and measured that one pair of wires has ~2.9 ohms and the ...
-1
votes
0answers
50 views

Can 220V 3 phase be run with 240V 3 phase [closed]

If the equipment tag says 220V 3 phase, would it be acceptable to run it on 240V 3 phase? The machine was made in Korea and they won't tell me what to run it on other than 220V 3 phase.
0
votes
0answers
46 views

RTX2080 Super - Fuse blown on PCIE 12v

I bought a 2080Super (Palit Super X). It was a cheapy on eBay and after a little bit of poking around, I found a blown fuse on the PCIE power 12v. The card was absolutely dead, core didn't heat up etc ...
-2
votes
0answers
44 views

Looking for a High Power AC to AC Current Limiter [closed]

I work as a Purchasing Manager, however I do not have an electronics background. I have been asked to look for a Current Limiter for a Consumer Unit that will convert a Maximum of 65 Amps to no more ...
0
votes
0answers
43 views

How can I monitor my battery voltage with an Arduino while charging? [closed]

I am designing a powerbank that has inbuilt charger with a relay connecting to the battery and an Arduino for control. How can I connect and monitor my battery voltage with an Arduino while charging ...
-1
votes
1answer
23 views

Frequency Modulation Voltage Formula Derivation

I am taking Keysight "Signal Generation and Digital Modulation" Webinar. In class, frequency modulation is described in the slide below. The modulated (carrier signal added with transmitted ...
-2
votes
5answers
92 views

With an LM741 can I power this circuit in such a way that there is enough current to power the base of a transistor? [closed]

With an LM741 can I power this circuit in such a way that there is enough current to power the base of a transistor? I intend to connect an output of this ckt to the base of a transistor.
-2
votes
0answers
46 views

I have 3 12 volt batteries, I need to supply 15Vdc to my inverter, I need the 3 extra volts for my inverter to start my refrigerator. Any Ideas? [closed]

I have 3 12 volt deep cycle batteries, I need to supply no more 15Vdc to my inverter, I need the three extra volts for my 3000kw psw inverter to start my refrigerator. Any Ideas?
0
votes
1answer
43 views

Why do pcb in battery reduce the input voltage that goes to the single cell li ion battery [closed]

And... Why do li ion battery cut when charged directly with 5v and 1amp
-1
votes
1answer
93 views

I want to model a voltage source proportional to the frequency in LTspice [closed]

Is it possible to make a function for a voltage source that is equal to V = kf where k is an arbitrary constant? Is there a spice component that can achieve the same result? I am doing this to model ...
5
votes
6answers
1k views

Power = Voltage x Current

I understand the equation that Power = VxI. Due to the Joule heating effect, engineers prefer to keep V high and I low to minimize the heating losses. When I think of current, it is the number of ...
0
votes
1answer
47 views

Maximum input voltage to measure in multimeter/oscilloscope

I'm about to buy a Hantek 2D72 combined multimeter - oscilloscope. In the specs it says: Input: Maximum Input Voltage 150VRMS DMM: Maximum Input Voltage AC : 600V DC : 600V Maximum Input Current ...
-2
votes
0answers
34 views

High voltage input of inverter circuit

Above is a 12V DC to 120V AC inverter circuit and its step up voltage. Question: Is it possible to step down, which means 240V DC is being stepped down to 12V AC because if the mosfet and transistor ...
1
vote
1answer
57 views

Understanding the safe operating area of a 1.7 kV rated MOSFET

I am looking at the datasheet of a 1.7 kV SiC MOSFET from CREE (C2M0045170D) which is attached here. I am under the impression that if I control the MOSFET using PWM, during the turn-ON period (ton=10 ...
-1
votes
1answer
77 views

How to calculate voltage between AC phases with different angles? [closed]

I am trying to understand some fundamentals about AC three phase wave forms, in this case is related to how to get the voltages between phases in real environment that as we know they have different ...
4
votes
2answers
630 views

Russian к2лн641 VFD (Vacuum Fluorescent Display) driver pin out help

I have recently acquired some IV-3 VFDs (Vacuum Fluorescent Displays) and they came on an old PCB with drivers. The driver is a к2лн641 and have found a datasheet on it with some information, but it ...
1
vote
3answers
85 views

Why doesn't the voltage divider rule work with a TMP36 temperature sensor but does work with a thermistor

I recently got an assignment to investigate the relationship between a temperature sensor and its resistance. Because of the lockdown I was required to use simulation. The simulator only has a ...
0
votes
2answers
80 views

Can current flow from positive to positive in real life

How to implement a circuit diagram where there are 2 batteries and negative to negative have load and postive to positive have some load. How to implement, like build in real life this ...
-1
votes
2answers
66 views

Why does the output value of my AOP change? [closed]

I want to retrieve voltage and make some operation with it, so I used an AOP to follow the voltage. Whithout R6 and R5 in open circuit, the AOP follows the signal, however when I put voltage divider ...
0
votes
1answer
51 views

Are on/off switches for a 12 volt kids ride on tractor interchangeable?

I don't have much knowledge when it comes to electrical stuff so, I could really use some help. I got my son a 12 volt ride on tractor several weeks ago. The red LED power on/off switch is now broken. ...
-2
votes
1answer
75 views

Switch between 2 voltages

I want to switch between two input voltages separately. How can I do ig with a MOSFET or other things?
0
votes
1answer
54 views

Can I run 2 relays in parallel for dry/wet contacts?

I have 2 separate relays that are getting 24VAC signals to open/close a NO contact. The end device (FAN) has 2 terminals that give out 24VAC (SS CMD, wet contact). When SS CMD contacts are jumped/...
-1
votes
2answers
41 views

Soil Moisture Sensor Power Issues

I'm working with some capacitive soil moisture sensors (https://www.amazon.com/gp/product/B07SYBSHGX) for a project and I'm having difficulty powering them off my power supply (https://www.amazon.com/...
2
votes
3answers
89 views

Temperature vs diode voltage in Shockley's equation

I was recently tasked with designing a temperature sensor using a general purpose diode. The design uses a constant current source (1mA) for diode excitation. So far, so good. The circuit works as ...
0
votes
1answer
28 views

SIM800C Does Not Work (State LED Does Not Toggle/Set)

Hope you are doing well. I am trying to use SIM800C GSM/GPRS module for my project. On the datasheet it says: ...
0
votes
1answer
68 views

7809 voltage regulator output voltage mismatch

I am learning electronics. Today I tried using 7805 and 7809 voltage regulators with a 12V battery. Though my battery is of 12V, currently it has 8.76V in it. In my first attempt, I connected a 7805 ...
1
vote
1answer
145 views

SDA and SCL for I2C are always low

I designed a PCB board with some sensors (gyros, accelerometers, and etc.) using the I2C protocol to communicate. However, when I use an Arduino UNO as the master, I'm not able to see the waveform of ...
0
votes
3answers
120 views

How to drive a LED 120-126v 1500w from 230v (or 12/24v)? [closed]

I need to feed a LED with 120-126v 1500w, made of two strips, 750w each (the heat being generated over a surface of 8cm x 8cm). EDIT: This is for imaging purposes, so high CRI, is important. ...
0
votes
0answers
44 views

Problem with how circuit work in china transformerless voltage sensor pilot lamp

I want to actually understand the circuit completely but for the specific, i want to really understand how this circuit can actually output ac voltage in OUTPUT_SENSOR point and the waveform is ...
0
votes
1answer
36 views

What voltage difference should I use for 10BASE-T?

Looking through some resources about the electronics behind ethernet, specifically the 10BASE-T standard, I've found some conflicting information about what the voltage differential should be for the ...
0
votes
1answer
50 views

I want to control 24V relay with NVIDIA Jetson

I have NVIDIA Jetson Nano Developer. I want to control a 24V relay with Jetson pins but I am undecided on which method to use. (Transistor, MOSFET) The other thing to know is that Jetson pins work at ...
0
votes
2answers
46 views

'high' .5V 'low' .05V instructions sent into ALU determine how hot the circuit gets or similar?

If you were to send instruction sets of all 1's which sink voltage into a circuit. Would that cause the circuit to heat up in oppose to sending 0's? My logic behind this is the sink it requires more ...
0
votes
3answers
40 views

Output voltage in a BS270 circuit

I am reading through Exploring Raspberry Pi and in a section on FETs, there is an example circuit. I understand how the controlled current is calculated $$I = \frac{V}R = (5V)(100\Omega) = 50mA)$$, ...
0
votes
1answer
56 views

Enhanced precision in the middle of a potentiometer

I am building a flight simulator rig that uses potentiometers to measure the position of various controls. I'm using a 10 bit ADC to read the value of the potentiometer as a fairly basic voltage ...
1
vote
2answers
76 views

Current calculation - basic circuit

I’m just starting off, and I’m watching a series of videos about the basics of electric circuits. https://youtu.be/lf0lMDZVwTI As you can see in the the picture, the teacher solved the current of the ...
0
votes
3answers
103 views

Identifying risks working with motorcycle wiring

I recently bought some light accessories to add to my motorcycle in order to increase visibility and safety. I was planning to have a motorcycle shop install them, I usually am willing to DIY things ...
9
votes
4answers
1k views

Oscilloscope low side connection

I am taking an introductory circuits class where we are learning to measure resistances. I recently measured the resistance between the low-side of an oscilloscope and earth ground on a power supply ...
0
votes
1answer
56 views

How to calculate for the voltage across resistor R4 and R6 using the operating point values? [closed]

This is the schematic diagram for the circuit that I need to solve. All I need to know is if it is possible to solve for the voltage across resistor r4 and r6 with all the given operating point values....
-1
votes
1answer
39 views

Achieve maximum power output of load with this transistor configuration?

How to achieve Maximum power output of the variable load with this configuration? I have tried to reduce the load, increase or decrease R43 & R49 but to no avail. Even if you try to increase the ...
1
vote
1answer
146 views

Capacitor blows up in TV power supply circuit

I have an LED TV Samsung T22B350EW (Type No.: LT22B350) which can not power on. I'm trying to fix it, to learn more about such type of circuits. A capacitor in its power supply board is blown up. The ...
0
votes
4answers
128 views

How to design this circuit in a simulator? What is wrong? (PSpice)

I am trying to implement this circuit in the PSpice simulator: I did it like this: I am getting this result: I was expecting something different than 0 in the output voltage. Could someone explain ...
0
votes
2answers
140 views

How to generate a -12V to +12V PWM signal from 0V to 3.3V (or 5V)

I want to build my own Type 2 electric vehicle (EV) charging wallbox. In order to communicate the maximum charging amperage of my wallbox to the EV, I have to generate a -12V to +12V PWM signal of 1 ...
0
votes
2answers
72 views

Input bias current and offset current calculation for an LM741 op-amp

This is my circuit diagram: The bias current of the LM741 op-amp is 80nA. The offset voltage is 1mV. The LM741 has relatively large current offsets, voltage offsets and input bias. I calculated the ...
-1
votes
2answers
55 views

Inverter circuit (DC to AC) [closed]

Hi readers, above is an inverter circuit that converts DC to AC. How do I increase the output voltage and decrease the frequency to let’s say 60 Hz? Above pic is the voltage I measured at AC (Vout).
2
votes
2answers
84 views

How to reduce 290V to 335V AC voltage to 220V to 250V safe range

In India we normally have 220V to 240V AC supply, but we have some problems in our area. The normal voltage normal is 260V to 290V, the service provider company is irresponsible, so I am handling ...
0
votes
1answer
52 views

Why is my switching frequency so abnormal?

I am using this Buck Converter 2A part. I am giving an input voltage of 3.3V to get an output of 1.2V for a switching frequency of 2.25MHz. I am giving different load currents of 0A, 0.2A, 0.5A & ...

1
2 3 4 5
134