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).

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16 views

Question about LED circuit

I’m trying to repair an LED light fixture. In the fixture there are three LED in a simple series. Initially one of the LEDs didn’t work, acted like an open and all three were out. I removed the bad ...
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45 views

How to provide 3 options (pull-up, pull down and Open) in an IC

I have MAX9278 Deserializer IC. I have 2 doubts. Doubts : I am performing the schematic now. Below, I need to provide options for both 24-bit, 27-bit and 32-bit. How to provide the provision for all ...
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39 views

Measuring/confirming voltage and current

new to the site and to electronics. I just started learning about ohm's law and Kirchhoff's voltage law and trying to confirm values I am reading. I have a simple circuit with a 9 V battery, 100 ohm ...
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22 views

What is the importance of peak factor and form factor?

I get that form factor and peak factor are suppose to be ratios involving the RMS, maximum and average values of current or voltage for AC circuits, but I don't get specifically why those ratios are ...
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59 views

How can I choose suitable capacitors for a voltage multiplier?

I would like to use voltage multiplier sextupler the input voltage 1V and frequency 4 Hz and the load is a supercapacitor 11.5 mf. What's the most suitable values of capacitors that I should choose? ...
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22 views

Wiring 2P2S battery pack

I have 4 18650 batteries and I want to make a battery pack of it. If all the batteries were new and had similar voltage/capacity I could easily charge them all together in parallel with my charger. ...
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1answer
30 views

Single conductor connecting two parts of a circuit vs two separate circuits

In a textbook exercise, this circuit appears simulate this circuit – Schematic created using CircuitLab Solving it was no problem, but checking the answer it stated that i0 must be 0 as no ...
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2answers
28 views

CD4052 multiplexer with different input voltages

I've been working on designing a PCB for my indoor garden and i'm facing a problem i dont understand. In my design i use a multiplexer (cd4052), to choose which sense resistor my current sensing chip (...
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23 views

6v AC to 3v DC - pinball mod

I'm wanting to add a battery powered toy to a mains powered pinball table. The pinball lighting circuit is a 6V AC supply, while the toy is (2 x AAA 1.5V battery) a 3V DC supply - is my understanding. ...
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44 views

Outlet to charge car

Can I plug in a 220 volt charging cord to charge my car into a 4 prong 40 amp outlet? Not sure about the conversion of amps and volts?
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47 views

MCP73831 charger - how to control low voltage cell

Does the MCP73831 have a way to set a protection to shut down the main output if the supply voltage is too low? I would like to implement (without coding) a protection which disconnects the cell if ...
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Relation of Voltage of a line and its cross section area?

For a given power delivered, if the working voltage of line is raised to n times, then cross sectional area of line conductor would reduced to?
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79 views

Do I overload my batteries?

I have a LED bar with no visible spec but a DC4V written on the 5630 led strip, genuinely USB powered. Connected to an USB 5V 2A powerbank, it draws 1.4A @5.02V. Connected to an USB 5V 1A powerbank, ...
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51 views

Bench Power Supply for ESC and KV on motor

I have a bench power supply it can provide ~10 amps and ~30 volts. Working on an autonomous car project I have an ESC to manage a brush-less motor. Two questions I cannot seem to wrap my head around: ...
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81 views

No voltage induced in secondary coil of transformer with 5V 1.5 kHz voltage from Wien bridge oscillator in primary coil

I have built a Wien bridge oscillator which outputs 5V at 1.5 kHz. When I hook up this output to the primary coil of a transformer I can't measure any voltage in the secondary coil. Schematic: ...
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68 views

Why voltage multiplier decreases current?

As far as understand, a voltage multiple increases the voltage but decreases current. Can someone please explain why current decreases?
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Voltage divider with a potentiometer

I am trying to build a voltage divider as shown in the circuit. I want to adjust my Vout using the potentiometer within the range of 2V-3V. With my current R1 & R2 I am not able to achieve it. How ...
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80 views

Does light of LED depend on current or voltage applied to it?

During a job interview, someone asking me this question: Does the light of an LED depend on the current through it or voltage applied to it? This seems to be a very beginner question but in fact in ...
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97 views

How to make an LED turn on if the input voltage is below 5V?

First of all I'm new to electronics. I am an automation engineer and a robotics integrator, so pretty specialized. Please be clear! Thanks all. Context: PLC special circuit needs to stay at 5V ...
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32 views

Calculate voltage(sensor weight) to Kg

I want to get weight for load vehicle in Kg, I Used this product and I received like this output '1.361' How I can calculate(convert) this value to Kg(Kilogram)
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Switching between three output voltage settings on a switching regulator

I am currently in the process of designing a load control circuit based on a switching woltage regulator. The assumption is that the regulator would provide three different voltage settings based on ...
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67 views

What are the reasons two DC motors with same specifications and running with same power supply run at different speeds?

I am using two DC motors in my circuit. They are running on same single supply and also using same motor driver but one of them is running slower than the other one. There is 1.54 volt difference ...
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1answer
43 views

Impedance matching for broad bandwidth voltage amplifier

I need some basic advice for impedance matching: I have a photodetector (Det01CFC from Thorlabs) that generates a current. For my experiment, I would like to amplify this signal with an amplifier. The ...
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61 views

Parallel resistor before voltage amplifier

For my project, I would like to amplify the output from a photodetector for subsequent analysis with an oscilloscope. The output of the photodetector is a current. Since we are using a voltage-...
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Why CCTV system fails to turn on ? But SMPS seems to work [closed]

The CCTV camera system fails to start. Already when we have such problem, we are instructed to change the adapter through which we are plugging in. Now, again the CCTV camera fails to start. So, based ...
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Newbie Assistance - Understanding Fairy Lights

I'm VERY new to EE and am learning the basics. My first goal is wiring up some small lights for my son's LEGO projects, and am trying to sort out the basics here. Right now, I'm attempting to piece ...
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Selecting a SerDes IC based on format

I have a query regarding selection of SerDes ICs. I need to select an IC which is compatible with 3 formats - 24bits, 32bits and 27bits. MAX9275 - Just a sample IC datasheet in the MAX SerDes GMSL ...
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82 views

battery voltage supply too high for electronics

I am driving brushless DC motors with an STM32 blue pill. My application includes said STM32 blue pill, L6234 motor drivers, 2 MPU5060 gyros and 2 AS5048a encoders. I am using a 14.8V battery to feed ...
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22 views

finding output voltage of 2 cascaded sub circuits without KCL

Hi I am trying to cascade sub-circuit 1 and sub-curcuit-2 and find Vout2 with given Vin1. I do not want to just cascade them(connecting Vout1 node to Vin2 node) and write bunch of KCL equations. I ...
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114 views

± usage and absolute sign ambiguity

This is from the Datasheet for Texas Instrument's NE5532: Does this mean I can safely supply Vcc- = 0V, Vcc+ = 30V, and let all other voltages swing within that range? If that's the case, then that ...
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51 views

Is there a way to take a battery power source at 7.1volts 15Amps and convert it to 5volts 4Amps? [closed]

I'm somewhat new to electrical engineering, I've been messing around with Raspberry Pi and I'm trying to use a 18650 battery pack (2 batteries) to power a Raspberry Pi (and some other things such as a ...
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56 views

PSU using -15V and +15V in order to get 30V?

I've been a couple of days looking for an answer, but without much success. I was wondering if I can connect a 30V audio device to the +15V and -15V of a PSU (+15V / GND / -15V)? Or is it preferred to ...
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86 views

Voltage and Current Stability in a Voltage Divider

simulate this circuit – Schematic created using CircuitLab The voltage divider is used in many circuits such as biasing the base of a transistor, etc. Why is the voltage in the circuit on the ...
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21 views

Solving a circuit using Thevenin's theorem and superposition

I have the following circuit in an example problem from a book, where it shows you how to find the Rth and the Vth. The Vth has to be found via superposition. The Rth solution is Rth = 103/77R, which ...
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92 views

ADS1115 ADC input filter - active or passive?

I want to implement an ADC as part of my bachelor's thesis. The datasheet of the ADS1115 show that there is no filtering done by the ADC chip before the multiplexer. As I read here, it is good ...
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87 views

Effects of low voltage on power grids?

I understand that if load is suddenly ramped up on a power grid: A sudden increase in current is caused by adding these parallel loads to the circuit. The current increase thus increases the torque ...
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85 views

Constant current - what is the difference between loads

This question is more about what terms I need to be using in my search, as I haven't had much luck yet with my searches. With a constant current power supply, where voltage is set to 12v and current ...
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35 views

Use an LA6500 to increase the current output of an MCP4725

I am trying to use an LA6500 to increase the current output from an MCP4725 that I am controlling with an Arduino UNO. The LA6500 works well for voltages of 1 to 4 volts but but when I give it 5 ...
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66 views

16 bit analog reference voltage design for stm32 chips

I am trying to make custom 2 layer PCB using stm32 microcontrollers for my flight simulator rig. My intention is to use magnetoresistive sensors in the joystick to get 14 or 16 bit signals and ...
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96 views

How to fix an N-channel MOSFET that's always on, without using resistors

First things first: I'm very new to electronics Getting right into it: I am trying to use an N-channel MOSFET as a LED strip light switch, with 12V at 1.5A supplied to the source and 4.5V from a ...
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1answer
51 views

Help with LEDs in parallel

I am working on a project where I have to use string LEDs running on 5V (USB power.) I had purchased one such string, which is 10m in length and has roughly 50 LEDs inside. My specification requires ...
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1answer
58 views

Infinite current draw for BLDC/Synchronous AC motor

I have recently created a motor that runs off of outlet power, single phase 120 V AC. My stator is taken from a universal motor from a vacuum cleaner and has two windings on either side, wired to form ...
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50 views

How is it possible to produce picovolts or femtovolts?

How is it possible to produce picovolts or femtovolts? (artificially)
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32 views

Ion current measurement

I have a few questions: To measure the ion current in air plasma from a source that works in pulses, what method is best for ion current measurements? Is it by using a Rogowski coil or by measuring ...
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4answers
77 views

Current limiting circuit operation

I cannot understand how this current limiting circuit works. Image source: UNLV Physics Department, Bill O'Donnell, Current Limiter Circuit Here is where I get confused: When Q2 is turned on, the ...
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47 views

Help needed in understanding why a circuit invovling a FQU13N10L mosfet is not working

I am a relatively new to circuity and have had issues selecting the right mosfet for my circuit(see below). I am attempting to control the flow of 12V at 1.5A, from the source of my mosfet using 4.5V ...
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Achieve 6.6V DC using 2 or more ESP32 output pins in series?

I need to use the ESP32 to trigger a SPDT relay. The output of a single pin is insufficient to surpass the relay's threshold. Can I combine multiple pins to achieve greater voltage? This ...
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1answer
33 views

Determine voltage regulators for a circuit

I'm trying to determine if the switching voltage regulators I want to use in my circuit are suitable. I want to use the regulators to change a 50V line into a 5V line that supports motors. The motor ...
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MC34063A: Problem with obtaining step-up performance

I am working with a MC34063A voltage regulator in order to prototype step-up power management solution, with control logic to switch between three different output values. I encountered some issues ...
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4answers
1k views

Why does the voltage drop when I connect an 8 ohms 1 watt speaker, specifically the source to the circuit is GPIO pin output voltage?

This circuit I am using to drive a speaker is acting strangely. Case 1: When I connect the 3.3 volts source from the Nucleo board it works fine as expected (in terms of the sound.) When I check the ...

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