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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26 views

ajustable resistance and MP2307

i try to make a current 4.2v with the switching regulation methode as you can see in the attached picture. The problem is that when i ajuste the voltage manualy from the ajustable resistance to 4.5v ...
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how to detect postive or negative pusle and if it is near to 0

I have an input with alterntive electrcity with between -5 and +5 what is the simple way to detect if the signal is postive or negative and if it is near to 0 form the negative side or the positive ...
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42 views

Calculate Vth between A and B

simulate this circuit – Schematic created using CircuitLab In this circuit, I am asked to calculate Thevenin Voltage Vth between A and B. This is the first time I am asked to calculate Vth ...
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How to limit maximum voltage when it's 0.1V too high and the device controller complains?

I built a retrofit Li-Ion battery pack for a scooter that originally ran on two 12V SLA batteries in series. I measured the voltage of the original SLA charger during the CV phase and it measured 29....
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37 views

Protecting IC from voltage spikes

I'm currently designing a PCB with a boosted audio amplifier. It is powered with a single li-ion cell with 3000mAh capacity. According to the datasheet of the audio amplifier, it is recommended to add ...
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Problem calculating fuses

I am calculating a fuse and I'm having a bit of trouble. I have a 12v 2A power supply that I want to protect, so my first thought was to place a fast 250v 2.5A fuse in series so it should blow if a ...
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57 views

What does an U244B IC’s input voltage do?

I’m new to electronics and I’m trying to connect a U244B ic on a breadboard. One pin says it’s an input voltage (pin 7). It works without anything being connected to the input and with battery ...
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410 views

Can a DC brushless motor produce the same torque at different power levels?

I am looking these Neo Brushless motors for a project. Here are the links to the data sheet and also to stall testing from the company: http://www.revrobotics.com/neo-brushless-motor-locked-rotor-...
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LED Brightness or Luminance is additive or not?

Let us say I have an LED whose brightness or luminance value is 50 Cd/m2. If I lit 10 same type of LEDs with same conditions of current and voltage then will the brightness of these 10 LEDs will add ...
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37 views

What happens to the torque/speed curve of a brushless motor when I increase the voltage?

Here is a an image of the torque/speed curve. My guess is that increasing voltage will simply translate the curve up because the slope is the torque constant, which is a physical motor property that ...
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1answer
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Does increasing voltage increase the torque of a brushless motor?

1.) I have a brushless motor with testing data at 12V. I want to know if I increase the voltage supply, will this increase the torque? In my research I keep seeing "current controls torque, and ...
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Smart High and Low Side Mosfet

For example I have two smart high or low side mosfet that have 4 channel. One high side driver has 1 amper per channel. Other high side has 2 amper per channel. I tested these smart high side mosfet ...
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Low voltage cut off on 10s battery? GPS tracker on e-bike

I'm trying to put a GPS tracker in my e-bike battery so that it is hidden and always powered on. It accepts up to 100V so that's no problem but if i directly connect it to the cells it will ruin my ...
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218 views

What informations can we obtain with these voltage and current measurements of a little electronic device?

I powered a little electronic device with 2 AA batteries and here are the results measured with a multimeter: When using a first set of 2 AA batteries: Voltage when device unplugged: 2.45 V Voltage ...
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why volt is needed for calculate watt? [on hold]

hello i dont sure what is the difference between voltage ampere and watts. voltage is only the potential difference between points high voltage will not cause to the electrons to move faster so why ...
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480v Single Phase forklift battery charger wiring?

I recently have been asked to install a battery charger that came along with a forklift purchase. It is a 480volt 1ph charger. It has terminals labled L1,N,G. The plant is wired 480v 3ph, with 277v ...
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LiPo short circut

I connected my LiPo battery (4S 1500 MAH 14.8V now 15.2V) to the charger that came in the set through the pins and there was a short circuit. I unplugged the charger immediately. The smell of burned ...
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1answer
40 views

Separation of same layer traces

I've seen this capacitor: https://api.kemet.com/component-edge/download/datasheet/C0603C221JDGACAUTO.pdf It is a 0603 capacitor with a 1000VDC rating. As I am familiar with IPC2221, this did not ...
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Most efficient way to convert from 3.5-4.2V (singe cell LiPo) to stable 3.3V for currents up to 500 mA?

This question is hypothetical - there is no specific project, I just have an obsession with efficiency. I use a lot of 3.3V modules, and have a bunch of single-cell LiPo batteries (which are amazing)...
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Voltage sweep circuit for non-linear voltage source

I am in a need of a simple circuit for sweeping a voltage of a solar cell and measuring the current. I started with a simple voltage regulator, such as this one: and adjusted it so it would work ...
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39 views

AC to terminal block relays

How can I use one power cable to connect to 4 relays in parallel? So for example, I have one power cable and I want to turn on 3 radiators out for 4. This is my screenshot of the circuit. Terminal ...
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1answer
32 views

How to get right voltage output with Bts7960b H-Bridge?

I am using a NodeMCU to control a BTS7960b motor driver. (datasheet of the BTS7960) This driver controls a 12v dc motor. This image shows my wiring (without the display and the buttons and with a ...
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Designing a circuit to fit a v-i characteristic graph

Here is the graph I'm trying to fit a one-port circuit to: I can only use linear resistors, ideal diodes and independent source. Here is what I got: I have no idea how to check this, I just used ...
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2answers
46 views

Finding a current in a given circuit

The problem has given the following circuit: And asked to find the value(s) of Ix if the elements absorb the power(s) given. I tired to set up KCL/KVL but I keep getting stuck. I first drew this: ...
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Cutting strands of wire [migrated]

I am a hvac tech, but my question is I have 2awg stranded and my plug is 6awg, will it matter much if I cut some strands to fit my plug? the plug is 60amp 250vac for a piece of kitchen equipment if ...
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39 views

Reverse Voltage Protection with feedback circuit

I would like to understand on the feedback transistor circuit in the given reverse voltage protection circuit. Voltage Input: 7V to 32V.
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2answers
45 views

Interconnect 5v - 3.3v

Is this correct to connect 5v outputs and 3.3v inputs ttl logic via an open drain transistor and an internal pull-up resistor on the digital input? I suspect the 5v part can influence to the 3v part ...
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Does current in neutral wire flow like this? [duplicate]

I've read neutral wire in 1 phase AC at home has almost 0V at both ends. But still current flows through it. So I've assumed 0.1V potential at the other end near a resistance (bulb). Now there's a ...
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86 views

Why do we not get shocked by neutral wire and how can it behave as it does? [on hold]

I read some articles and watched videos regarding 1 phase and 3 phase ac. And later found that for most home appliances we need 1 phase ac. Then I came to know about live and neutral wires. Few ...
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2answers
100 views

What IC can I use to translate signal voltages with varying voltage? [on hold]

I have 8 signals at approx 10 MHz (square) that can be at 1.8V, 3V, or 5V (peak-to-peak). When set, the signals do not change voltage. The voltages can only change if set manually by human interaction....
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44 views

Is it safe to go over a fuse holder voltage rating?

I am looking to buy a few online fuses and fuse holders for the mains power into a kiln I’m fixing up that runs on 240V and draws 45A. A thick 6 AWG wire connects to mains power, then is split into ...
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36 views

Voltage of capacitors for MIC29302

I want to use MIC29302 as regulator in SIM800L circuit. In the suggested circuit in the datasheet there is a 100 µF capacitor before the regulator and a 330 µF capacitor after the regulator, but ...
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8051 LCD interfacing works in Proteous but doesn't work in hardware

I'm working on this project using an 8051 micro controller (AT89S51) and it involves interfacting with an LCD. The schematic of the project I'm working on is shown below: And I've written a very ...
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46 views

Voltage dip at source side during heavy loads due to Internal Resistance

In any application, during initial start-up/load step, there is an high current requirement. Due to this high current requirement, there is a dip in that connected voltage rail. I researched on why ...
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Does the word voltage exist in academic engineering?

In Portuguese, the word voltage does not exist. Neither academic nor technical. In engineering, Portuguese speakers refers to volt as electric tension or potential difference. The word voltage was ...
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57 views

Voltage drop after optocoupler

I don't know what's wrong... I have an ATTiny13 which gives a dummy impulse turning a fan on and off every 2 seconds; so the plan. I attach two power sources (for dummy purpose) before and after the ...
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2answers
73 views

Why is voltage across LED filament bulb slowly decreasing?

I'm trying to power this LED filament bulb with a 12V - 2A DC wall adapter. LED specs: rated at 4W 12 to 24V input I'm pretty new to this, but if I get it right: Calculus the LED bulb will draw ...
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27 views

capacitive displacement sensor calculation

while studying this certain types of problems with capacitive displacement sensors I came across one in particular that I am pretty much stuck. The whole problem is explained in following text and ...
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57 views

Is it possible to control a PWM computer fan with a resistor? If yes, how? [closed]

I have a video card that is loud while idle, because the fan curve appears to be set rather aggressively. Unfortunately, this can not be changed via software. The fan is connected with a regular 4-...
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2answers
133 views

Measure LiPo Battery Cells with Voltage Divider?

First, I am new in this topic, so please excuse unnecessary questions. I want to measure the (four) cells of my lipo battery. The connector of the battery has a plus pole and four minus poles. (Image)...
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53 views

Less noisy version of max232

After (mentally) banging my head at the wall wondering why my own circuit is glitchy after the PC communicates with it, I read some posts, and noticed others had very similar problems. All because the ...
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2answers
36 views

Voltage gradient in voltage difference across a resistor

If I have a voltage difference V from terminal 1 to terminal 2 of a resistor. I take an arbitrary point P along the resistor, between terminal 1 and terminal 2, and take terminal 1 as a voltage ...
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1answer
58 views

Can a 74AHCT IC be a drop-in replacement for 74HCT IC

I have a circuit in which I interface a radio module running on 3.3V indirectly from a 5V supply. I use a regulator to provide the 3.3V module VCC and the data is exchanged between both circuits ...
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39 views

What is the current limit of driving a linear actuator for 4 VDC at 12 VDC?

Please bear with me, if this is a stupid question. I obtained a linear actuator of a family of linear actuators, here are the specs ...
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35 views

Is there an adjustable voltage converter that could take an input of 18 volts to a 0-18v and handle an amp draw of 20 to 30 amps?

Trying to change a power tool from a 9.6 v 3.3 ah nimh battery to an 18v 5 ah lithium Milwaukee battery
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57 views

Power consumption problem in high-voltage power audio amplifier

I have a problem with my power audio amplifier. I am unfortunately forced (because of the specifications I have been given) to make it work at a dual voltage of +-90V. Finding the components to do ...
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1answer
39 views

Minimum Current for Zener to Clamp Vgs of Mosfet?

simulate this circuit – Schematic created using CircuitLab When it comes to zener diodes I find it hard to get information about minimal currents needed for it to breakdown so I thought I would ...
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1answer
67 views

Negative 15V supply from 24Vdc

For my application I have two AD633 Analog Multipliers that need a ground referenced +-15V supply. I have a 24VDC and a 8 VDC supply to use, but i would prefer to use the 24V supply. I've looked at ...
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2answers
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The lifetime of a WSN [duplicate]

What formula(s) should be used to determine the lifetime value of a wireless sensor node, charged up by a supercapacitor(its capacitance value its known), with a given power/energy consumption? It is ...
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46 views

Active low-pass filter

I have some question about active low-pass filter. First, I want to tell you guys that don't have enough knowledge in electrical. so, please explain your answer and idea clearly. Thank you. I want to ...