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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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, ...
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30 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 ...
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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 ...
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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 ...
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1k 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 ...
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1answer
262 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 ...
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2answers
1k 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 ...
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580 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 ...
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51 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 ...
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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 ...
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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, ...
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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 ...
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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 ...
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1answer
47 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 ...
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2answers
182 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 ...
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149 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. ...
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1answer
181 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 ...
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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 ...
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What causes voltage to increase from 12V to 36V as specified?

Reference article and paragraph: Relays, Selection & Usage (Part 1) - 8 - Latching Relays ...
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1answer
81 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 ...
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2answers
206 views

What happens if the load (connected to the output of the circuit) disconnects suddenly from Arduino/ESP32?

My circuit (that contains esp32 with few current and voltage sensor) is connected to 9Ah Battery (with BMS), where the load gets connected to see the discharge rate of the battery. There are times ...
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70 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 ...
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2answers
244 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 ...
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1answer
136 views

How is the energy consumption of a ciruit component calculated?

I know that watts are equal to amps times volts, and that watts are a rate of energy consumtion. I have looked at some circuits, but I am unsure of how the total energy use is being distributed. My ...
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1answer
567 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 ...
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456 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 ...
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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 (...
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1answer
310 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 ...
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1answer
122 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 ...
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1answer
47 views

1200W, voltage and cycle converter 220 to110

I have bought a Joule sous vide immersion circulator from USA. I want to use the device in India. I need to convert AC, 240V 50Hz to 110V 60Hz. After reading the literature on the company's website ...
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Do different Line-Ground voltages on a 240v L-L PSU fed from a 3 Phase High Leg Delta system pose a problem?

I'd like to know if there are any negatives related to powering an ASIC miner PSU at 240V, 2 hots and a ground (C13 plug), from a three phase, center-tapped, high-leg delta system, when the line to ...
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34 views

DC/DC MC34063 serial boost converter for increasing voltage

I am trying to build one ultrasonic mist IOT device for this github project. SO in the power supply part it needs to have almost 70V input voltage, so for more Voltage you can use boost converter ...
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52 views

My usb ports outputs different voltages

I have made circuit that runs on USB. however, when i plugged into front panel of my pc or raspberry pi, it only gets around 3.3v, but when i plugged it into back of my pc, it gets 5v as intended. ...
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47 views

voltage drop help

I have a little 24Vdc circuit where I am powering a small DC motor thru a set of contacts (connects the negative) on a relay where I then latch it in after the momentary switch controlling the relay ...
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67 views

Receiver of light signal

For homework I have to design a circuit which will take as input ultra violet light , it will convert it to an electric signal and then it will amplify it .Here is what I have done so far: simulate ...
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40 views

Reduce golf cart voltage from 48V to 36V

I've got a 48V golf cart. I had a light kit installed. The kit is a 48V kit instead of 12V so there is no voltage reducer. I want to add indicator lights on the dash to let me know when the blinker or ...
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39 views

Light sensor circuit

Hello for homework assignment I have to design an electric circuit which takes input from a light sensor and finds if the brightness is bigger than some value. This is what I have done so far: ...
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33 views

2003 Chevrolet Truck Suburban 2500 4WD 6.0L FI OHV Volt Drop test on fuel pump

I performed a voltage drop test on my 2003 Suburban fuel pump and the negative side of the fuel pump returned a voltage drop of only .02 Volts using the 20 Volt setting my multimeter. That's only 20 ...
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37 views

I have found the Rth=10 ohms, However i can't find the thevenin's voltage(between a &b)

*I converted the wye network into a delta and found the equivalent resistances in parallel and series and got it to be 10 ohms. However i am stuck at trying to find Vth. I tried applying mesh analysis ...
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37 views

Safe voltage drop(due to line length) for laptops and router?

Ahead of working from home this winter, we bought a 2000W inverter/generator to get us through a season that normally has a power outage, or a few. Attaching this to a couple extension cords, if I ...
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50 views

I2C line dropping voltage before making call to slave

I have been coding an stm32f3discovery to talk to the arduino nano as part of my project for building a drone. I have had it working before but have since made my own pcb for it all to link into and ...
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32 views

Is power calculated using source voltage or load voltage?

I am making a power meter that counts the mWh over the course of a battery discharging. I am using an arduino and an INA219 current shunt module. When the load is connected, the load voltage reported ...
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42 views

Use of resistors on signal lines of serial to parallel shift register

I have recently come across a circuit with a serial to parallel shift register(HEF4094B), and Vcc 12V. I could see that resistors are connected in series to the signal pins(OE, STR, DATA, CP). 2.2kΩ ...
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51 views

Did I calculate the current correctly?

Are my calculations correct. I used Ohms law to find I1. And then KCL to find the remaining currents. I figured I3 would be a negative answer since the other current source would be supplying power ...
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71 views

Input voltage on transformer

I’m replacing a transformer on hot tub. Markings on original were obliterated from rust. New transformer is marked as follows. 0 v blk wire, 115 v white wire, 230v red wire. The transformer receives ...
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28 views

Display port auxiliary signals biasing

I am using display port interface in my design. As per display port specification biasing circuit is implemented to auxiliary signals. Since AUXP and AUXN are LVDS signals they can be connected to 1....
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73 views

LVDS Interface - Output Max Swing is Higher than Max Input Swing

I am connecting together two "LVDS" devices. The specs are as follows: Output: VoDiff = 247-600 mV, Vcm = 1-1.485 (1.25 typ) Input: VinDiff = 100-500 mV, Vcm = 1-1.6 (1.25 typ) So for the ...
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1answer
53 views

Working out theveni. Voltage with no voltage source

How do i get the thevenin voltage having worked out the load impedance and obtained it as 3.415 -j0.7317 ohms
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1answer
153 views

PCB with Mixed Analog and digital

I am in the process of designing a new ADC\DAC PCB with a digital interface and analog front end. I have tried to separate the different grounds in my circuit to reduce the noise as much as possible ...
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1answer
34 views

Power for 1 Device, 1 MCU, and 2 modules

I have four things I need to get power to. The first is a device that needs 48V and 30W. The other three include an MCU and two modules. Each have various pins that need either 3.3V or 1.2V. I’ve ...

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