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).

741 questions with no upvoted or accepted answers
Filter by
Sorted by
Tagged with
3
votes
0answers
37 views

frequency of MCP3008

I built BOOST CONVERTER, I sample the output voltage with A/D and control it using RASPBERRY Pi3, I set the switching frequency of the BOOST CONVERTER 70KHz, and the frequency of the MCP3008 1.35MHz, ...
3
votes
0answers
44 views

Arduino Every Nano with 3.7V Li-Po - Reading voltage

I have Arduino Every Nano and 3.7V Li-Po battery (Akyga LP903759). I want to read the current voltage of a battery using analog pin. If I use a 50 kOhm and 200 kOhm resistor (in voltage divider) I'll ...
3
votes
0answers
95 views

Electrical circuits homework

I am pretty new to circuits analysis and I have the following problem as homework: ig2(t) = 4sin(ωt + π/4), e3(t) = 12sin(ωt + π/4), R1 = 10 Ω, ωL1 = 4 Ω, ωL3 = 3 Ω, 1/(ωC2) = 6 Ω I have to calculate ...
3
votes
2answers
284 views

Battery failing. Oscilloscope?

The question is - is there an inexpensive oscilloscope I can use to measure DC voltage and current to see why my battery pack is failing to power a DSLR? In order to take long time lapse photos with ...
3
votes
2answers
208 views

Voltage divider network calculation

Hello I am troubleshooting a voltage divider circuit in which I know the output going to U28 pin 3 should be around 700mv. What I am measuring however is around 7.5v. How do I calculate the v out for ...
3
votes
2answers
2k views

Transformer maximum voltage rating specifications

I don't know how to interpret the voltage values found in datasheets for transformers. For example, in the datasheet below: where it says 15v, 50mA near the winding schematic. Is this a maximum or a ...
3
votes
1answer
293 views

Switch bounce vs LC Spike Voltage

For my EE lab, our professor wants us to show switch bounce, and then eliminate it using hardware, and software debouncing. However, I seem to be stuck on finding the switch bounce in the first ...
3
votes
2answers
2k views

Schematic for a lipo battery bleeder overcharge protector

OK, so I am building a 12v (really 11.1v) 10000mah lipo battery. I am going to use it on campouts to run things like 12v fans and car chargers and run other high-current devices that couldn't be run ...
3
votes
0answers
631 views

Convert [-24V,24V] range analog signal to [0V,3.3V] range for ADC

I need to realize a circuit that converts an analog signal from [-24V,24V] to [0V,3.3V] before sending that signal to an ADC "MCP3208". I found the circuit in the picture below and it works perfectly ...
2
votes
0answers
82 views

Question about outdated “amplidyne” technology

Can someone please help me understand something better about "amplidyne" technology that was used back in the day. What I know It appears to be a dc motor generator that acts like an ...
2
votes
1answer
106 views

The relation between Vin and Vout (diodes circuit)

Can anyone here tell me if the function I found that relates the Vin to Vout is right? So I made a mesh analysis to find the current in the first mesh (left to right) and in the second and got that ...
2
votes
0answers
81 views

Beginner trying to resolve transistor issues

I have designed a basic transistor circuit with the EveryCircuit simulator. The idea is that when the switch is open, one LED comes on and when the switch is closed the other LED lights up instead. It ...
2
votes
0answers
44 views

Solar panel simulation for 7 solar cells in series

I have this question about the circuit that I am working on for quite long and it is just not working. Please help, i have already tried every thing i could understand. I followed a YouTube tutorial ...
2
votes
0answers
135 views

Best way to manage multiple 12V inputs and outputs from Arduino?

For a bowling alley I am going to make a circuit using an Arduino Mega to turn on arrow lights(1-4 bulbs in each) given the bowling pin lights that are lit up at the moment on a masking unit. AMF no ...
2
votes
0answers
58 views

Is capacitor voltage coefficient a function of frequency?

I have learned that the value of capacitance in a capacitor can vary slightly compared to nominal based on the voltage across it. This is called voltage coefficient of capacitance (VCC) It is actually ...
2
votes
0answers
62 views

Wiring a siren to an alarm system, siren isn't going off when the alarm is triggerd

Hello I have an alarm system of Jablotron Oasis 80. I want to hard wire a sirene of another brand to it Aritech S290. When the alarm goes off then the beacon of the siren is flashing, but there is no ...
2
votes
0answers
80 views

Why does my lightbar draw more current when connected to a battery than a power supply

When I measure the current draw of the lights when connected to a car battery, they draw about 2.4A However if I connect the lights to a 12V power supply, they only draw around 0.8A. Even though the ...
2
votes
0answers
118 views

ESD Capacitor Calculation, 330Ohm Series Resistor and ESD Clamp Voltage

I have a input power filter circuit. It has ESD Protection capacitors which help to protect the downstream circuit from ESD Pulses. ESD Capacitors Specifications : C0001, C0002, C0003, C0004 = 47nF, ...
2
votes
0answers
63 views

Strange levels on UART TX

I am trying to get the boot chatter from a UART on IOT device. When powered up TX line goes high as expected (3.3V), but when it starts "talking" - scope shows that hi/lo levels swings are ...
2
votes
0answers
67 views

Replace USB diode with something else to reduce voltage drop

So I've made this circuit with a MOSFET and an Op Amp to select a voltage input to my battery. I sort of based it off the voltage selector circuit on the Arduino Uno board, but inversed since that ...
2
votes
1answer
69 views

Voltage sensitivity coefficients for unbalanced radial distribution feeders

I am wondering if my implementation of voltage sensitivity coefficients for unbalanced three-phase-four-wire radial distribution feeders is correct. We got \$\bar{V}\$ for phase(s) of all the buses ...
2
votes
3answers
191 views

How to estimate the temperature of a filament?

I would like to know how I can estimate/calculate the temperature of a heated filament. For example, the filament (rhenium) is 0.2mm in diameter and heated with a voltage of 6.4V and a current of 2....
2
votes
2answers
209 views

Step up converter

I built a circuit of boost converter and my input voltages is 6-9 V. I want to get output at the converter 9-12 V. My problem is that I get over 40 V and I do not know why, in the code do I have to ...
2
votes
0answers
400 views

MOSFET Gate driver - negative voltage with Zener circuit

I was reading about minimizing MOSFET switching loss when I came across an article by Texas Instrument on how to use negative voltage, instead of ground, to faster discharge MOSFET gate capacitance. ...
2
votes
1answer
197 views

Where does the 1V voltage come from?

I have a four PLC with many digital I/O connected similarly to the schematic below. If I use multi meter and measure the voltage between the two points in the schematic, why is it showing 1V? Isn't it ...
2
votes
0answers
42 views

Inductive Crankshaft Position Sensor Voltage Drop When Split Between Inputs

I'm working on a project with a vehicle using two engine control modules, which both need accurate crankshaft position signals to function. Adding a second sensor is not an option. The sensor is an ...
2
votes
0answers
111 views

What causes voltage to increase from 12V to 36V as specified?

Reference article and paragraph: Relays, Selection & Usage (Part 1) - 8 - Latching Relays ...
2
votes
1answer
121 views

Activating a relay when certain voltage received (Water injection system)

I decided to build a simple water/methanol injection system for my car and now I'm thinking about a simple way to activate the water pump only from certain boost level. For the boost reading I'm ...
2
votes
0answers
84 views

Voltage increase by connecting Voltmeter

I've got this scheme. V1 and V2 are voltmeters without their own power supply. (V1 gets power from the measured circuit, V2 is powered separately, but in this case from the same power supply.) The ...
2
votes
2answers
209 views

Dayton furnace blower wiring help

I bought the new Dayton 3 phase 208/230vac blower model #3HMJ8. There is 3 wires red/white/black and next to the diagram for each wire on the blower is a letter. I don’t know what these letters mean....
2
votes
1answer
734 views

setting a trimpot on a power supply

I'm creating a power supply circuit to regulate the power from a 12V power source to sap flow sensors that will be installed in a tree. I have a protocol and circuit diagram I am following but am ...
2
votes
1answer
1k views

Common audio signal voltage range on Line out connector

What is typical audio signal voltage range on Line out connector of consumer electronic devices? (Vmin/Vmax) I need specify Input voltage range to calculate op-amp. ...
2
votes
0answers
2k views

Datasheet for Keyes IR Transmitter (KY-005) wanted

Can someone help me find the datasheet for the Keyes IR Transmitter (KY-005)? I know how the pins work, I just need to figure out its voltage drop and how much current should go through it. Thanks! :...
2
votes
0answers
460 views

Voltage Translator (74HC4050) Voltage Fluctuations

I have a simple circuit with a simple problem that I just can not fix. I have a 74HC4050D hooked up to an SD card. I have a 0.1uf on the 5V line and 2.2uf on the 3.3V line. Whenever a signal is sent ...
2
votes
0answers
2k views

PSpice VSIN frequency - how to set it in rad/s?

I know, that if I want to set FREQ, I need to set it in Hz, not in rad/s. I know, that 1 Hz = 2*pi rad/s, but how to do this in PSpice? What should I enter exactly? and btw. if I want to set VOFF (...
2
votes
1answer
374 views

How do you output whole number voltages (1-4V) from an Arduino/5V source using only digital pins and passive components?

I would like to output whole number voltages 0V,1V,2V,3V and 4V from two digital pins on an arduino/5V source. A simple r2r ladder doesn't seem like it would work because it would split its definition ...
2
votes
1answer
123 views

Is there a pattern to where various industrial AC voltages are used?

AC voltages in the "low voltage" class vary quite a bit. I've seen nominal voltages of 208, 220-240, 277, 380-415, 460-480, 575-600, and 690 VAC. Past that I don't see anything until medium voltage ...
1
vote
0answers
58 views

What is the peak to peak voltage of a Colpitts Oscillator?

I am designing a colpitts oscillator having a frequency of 100MHz. However, I am not sure how to calculate the peak to peak voltage for the sustained oscillations. Attached is my workings. Is the peak ...
1
vote
0answers
40 views

Auto Voltage Selection between 12V and 5V for Irrigation Controller

Background I am working on a hobby project, it will be a general purpose open source irrigation controller. I haven't built the PCB yet but I want to power the board either through the USB port for ...
1
vote
1answer
38 views

Powering a NEMA 17 motor | Wattage Vs Voltage

I apologize if the question is silly as this is my first project involving stepper motors and I'm confused about power supply specifications. So I'm working on a project involving: 3 NEMA 17 Stepper ...
1
vote
0answers
55 views

Can you cross Live and Neutral traces on opposite sides of a PCB?

Can 230V live and neutral traces be crossed over if they are on the top and bottom side of a PCB? I know there are requirements for creepage and clearance; if that requirement is less than the ...
1
vote
0answers
42 views

opamp single supply output AC (audio) voltage limit

I build non-inverting op amp with single supply voltage cca 9V. The basic scheme is shown in the figure below: How to limit output AC signal if the base DC voltage is at half the supply voltage 4.5 V ...
1
vote
0answers
73 views

How to get an old beer sign to work again?

Has anyone tried to upgrade an old beer / cigarette sign before? I'm a total electronics noob, and I got my hands on one of these old Coors signs that has a 45x7 LED display board. The board has what ...
1
vote
0answers
29 views

Differential Signal Measurement best practice

I have 4 differential signal pairs (LVDS Data lines and Clock) running between my Microcontroller and TFT. There are no test points over the lines. Can someone tell me what is the best practice and ...
1
vote
2answers
55 views

Use of series inductor to control small 120v blower

I want to run the 120vac blower less agressively. Like 9ov instead. I find that I can series install an inductor and that works well. Q1 Would it be best to use a buck xfmr instead? Q2 How does ...
1
vote
2answers
65 views

Can I replace a board fuse like the one in the picture with a radial one?

The fuse on one of my commercial printers blew. See picture below. I am planning on replacing it but cannot find an exact fit. The closest I can find is another 400mA / 72v fuse that is labelled as &...
1
vote
0answers
27 views

V-I characteristics of a non linear, bilateral element

My professor had told us that Bilateral elements have V-I characteristics which are symmetric about the origin. However, in an exam, we were asked to draw the V-I characteristics of a non linear, ...
1
vote
1answer
96 views

Automotive electronic circuit design, Voltage divider to uC ADC pin

Automotive Circuit requirement: If input pin is connected to Battery(T87 line), the output of the circuit shall provide a output voltage of 5V to ADC pin of microcontroller, if the input pin is ...
1
vote
0answers
49 views

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 ...
1
vote
1answer
62 views

Can I control the flow of a 12V power supply with a 4.5 volt power supply and a IRF3205 mosfet?

To start I am very much a beginner at electronics and am very limited in my tools. I bought a IRF3205 mosfet a few days ago hoping that I could use it in a circuit I have where a 12V power supply at 1....

1
2 3 4 5
15