Questions tagged [electrical]

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1answer
34 views

High voltage circuit powering Arduino/ESP32 - requesting feedback?

I have been struggling with this for days...This is the first time using switched power supply units to power an Arduino. Can you tell me if this is wired correctly? If not, what needs to be fixed?
2
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1answer
61 views

My RTL viewer replaces NAND gates with AND gates with the inversion bubbles

I want it to show this MUX only with 3 NAND gates and an Inverter. so, I specified NAND gate in the verilog HDL code, but it keeps replacing it with AND gates with inversion bubbles without having a ...
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0answers
67 views

What is the off-white powdery material found at the base of GU5.3 light bulbs?

I've noticed most GU5.3 light bulbs, both halogen and LED, contain a granular material at the base. There seems to be considerable variation in how much of this powder is present, even within the same ...
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1answer
154 views

Gain of a Dual Gate MOSFET

simulate this circuit – Schematic created using CircuitLab This is the schematic of the circuit but tried to find the gain of this circuit, assuming 50 % of the Duty Cycle for the LO, and M2 ...
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0answers
46 views

Switchgear dielectric testing and impulse polarity

What is difference between negative and positive polarity impulse test? Why Negative only done for internal dielectric strength and positive polarity impulse only for external dielectric strength? ...
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0answers
46 views

I am trying to find Vc(t) for t ≥ 0

I am trying to figure out how to find \$V_c(t)\$ for \$t \geq 0\$ in this.
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1answer
77 views

What device controls whether a signal is high or low

In circuitry, there is always inputs in circuits (for example: input A and B into an AND gate), but what exactly allows these inputs to switch states? I think the best way to illustrate what I have in ...
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1answer
28 views

Confusion on Voltage levels in Digital Waveforms

My question is why Io is in different direction when Vo=H and Vo=L respectively? I really can not understand the underlying mechanism!
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0answers
32 views

How to make equivalent circuit diagram for 150 kV Lattice tower transmission?

How to make equivalent circuit diagram for 150 kV Lattice tower transmission. I need to make a EMTP simulation for lightning strike and see the effect to backflash over.
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1answer
44 views

How to design an amplifier to meet particular specifications

I need to specify the (W/L) ratio of transistors and the value of the current source in an amplifier as shown in this picture so that these specifications are met: *the height of the input step for ...
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1answer
44 views

About signal conversion

Question is weird but it's about something that I really want to try. AC power here in India has 50Hz frequency. What I really want to try is to make a series path with two continuous conversions. In ...
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1answer
27 views

Coaxial cable test with VNA to estimate Wave Velocity and Attenuation

I'm doing a lab course concerning microwave measurements, during which I'm supposed to test an open, short and 50 Ohms terminated coaxial cable. The cable is connected to a VNA at the S_11 port and ...
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0answers
41 views

What is the process behind the forming of a low voltage electrical arc?

I am trying to understand the exact process undertaken when forming a low voltage high current electrical arc, such as in a welding scenario. My understanding at present is that without a high voltage,...
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4answers
58 views

Posssible Delay for a electric circuit needed

While I know that it is impossible to slow light down I was wanting to delay an electrical response from a diode using either a resistor or a capacitor but I could not remember, which does which. The ...
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0answers
38 views

Is there a potential earth leakage or is it something else?

I'm facing an issue in my house since last Christmas. When the lights or appliance with motor in any room are turned off/on the TV would go out and come back on in a short span (as if the power went ...
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1answer
60 views

How to effectively avoid current drops while stepping down the voltage?

We are using a PC power supply to power our project, which is a Robotic arm. Since our power supply has a 12V output voltage, can anyone please advise how to step down the voltage (12V) to 6V. Using ...
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0answers
93 views

Cable tray width selection as per NEC 392

I would like to ask if anyone know what is the meaning of the letter b used in the formula in the table 392.22 National electrical code 2017 article 392, pic (attached)
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1answer
27 views

What is all properties of orthogonal axis (dq) axis?

We know about the transformation between abc three phase to dq0 axis which is orthogonal. BUT I am confused about What is the added value and all properties of orthogonality for dq0 axis that help in ...
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1answer
46 views

Is there a RF signal device for a 120 or 240 vac wire to start and stop a standby generator?

Our standby generators automatically start when a switch in the automatic transfer switch closes and the gen stops when that switch opens. Usually we bury 2 16ga wires along with two 120/240v hot and ...
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0answers
51 views

Design of a 5kW residential Solar system with battery- need help with electrcial diagram

A design project asks for a design proposal of 5kW solar panel with inverter and battery system for a residential house. I have completed the energy estimation, panel size, orientation, and selected ...
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0answers
86 views

Can a circuit have capacitors in both series and parallel?

From my understanding, two capacitors (or any electrical elements) are in series if the same current goes through them. Two capacitors are in parallel if they are connected to the same wires on both ...
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1answer
64 views

Please help guide if my understanding is correct

Please help check if my understanding is correct for the above circuits. As per my understanding the Voc=4v, since we have opened the circuit and there is no current flow. If that was not the case we ...
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0answers
34 views

LCD Dimmer with Variable Resistance Circuit

essentially I'm trying to make a very basic circuit where a 3.7 volt battery is wired to a liquid crystal display, (or LCD), and the brightness of said display is controlled by a pentiometer to ...
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1answer
81 views

Does these terms consider the same Voltage, electric potential, and potential difference

What are the differences between these terms ? do they are considered the same
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1answer
33 views

The best way to test a solar panel generation

Is there any way to test how much a solar panel on a given position can generate for let say a day or few days. Like a multimeter that can automatically test the wattage days example? Or create a ...
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1answer
166 views

Find rotor stator loss in a 3 phase delta connected induction motor?

I'm trying to work out stator input power of a 3 phase delta connected induction motor. I have the equation Stator Input Power (P1), where P1= Pm + rotor copper loss + rotor stator loss. I have Pm ...
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1answer
153 views

Torque in a 3-phase delta connected induction motor

I know the equation for torque is T=[m*(N2/N1)^2/2*pi*Ns]*[s*E1^2*R2/R2^2+(s*X2)^2] N2/N1 is the effecting rotor-stator turns ratio. I have it written ...
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1answer
117 views

What is the relationship between Ground Potential Rise (GPR) and Source Voltage?

I am looking at the results for an earth grid study for a 50Hz substation. Primary Voltage (Vp) = 11,000V Secondary Voltage (Vs) = 415V Secondary Fault Current (If)= 24kA Secondary Grid Current (...
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1answer
32 views

How to know if a motorcycle battery and power generator is enough to keep an device turned on without discharging the battery?

I have an arduino project in mind but I have some questions before I can start to make it. I need to plug an arduino Uno on my motorcycle, but I dont know if it will consume too much energy and lower ...
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0answers
132 views

What is the definition of hull voltage?

I'm studying the subject Electrical Safety in Engineering and a special term really drew my attention. When I tried to google it, no any option was suggested but hull protection. In the presentation ...
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0answers
102 views

Transparent Conductive Paint

Does anyone know of a transparent conductive paint? I am creating some home made electroluminescent panels and I need something what would work with water based polyurethane. Ive had some luck with ...
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0answers
144 views

Aluminium foil not blocking IR signal

I am using an IR sensor (vishay tsop32 series) but I want to ensure that it only sender directly ahead so I made blinders out of pla and covered them in aluminium foil. However it seems that despite ...
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1answer
61 views

Creating a small range, small baseline varying resistor

I am doing a design project on making a passive varying resistor device. I have a flex sensor that increases in resistance when you bend it. It has a 10k ohm nominal resistance and increase to 110k ...
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1answer
1k views

Can anyone please help me with this ETAP Project?

I'm trying to run the load flow study, but instead I'm getting this error. Error 101-01: [Bus 2] Bus base kV is out of 40% range from bus nominal kV. Error 722: [XFMR 1] 2W transformer secondary kV ...
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1answer
609 views

Interface Submersible water pump with microcontroller using Contactor Relay

I am making a automatic water level controller for my home,I am new to Electrical Engineering and learning things. I am using a MCU to turn ON/OFF submersible water pumps using some float switch to ...
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0answers
4k views

Ultrasonic Sensor HC-SR04 without Arduino

I am trying to build a circuitry of obstacle detection. So, till now my research says, I need : ...
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0answers
28 views

Why single phase motors uses double pole single throw switches instead of a single pole single throw switch?

I've seen many motor starters that have double poles to contact the motor leads to the AC source. I wonder if there is any reason for not using single pole single throw switches which are mostly used ...
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0answers
51 views

Restoration of time-shifted audio file using matlab

The two stereo channels of audio file are time shifted. Which is the easy model to restore the file to the original? I have a partial solution something like: Loading file like, ...
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1answer
34 views

Sensitivity of a frequency meter

Can I know the sensitivity of a power frequency measurement unit? I can not find it in the specifications sheet. I do have, though, the accuracy of the unit (10 mHz) Thanks in advance!! Update : I am ...
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2answers
66 views

Three phase AC power measurement

I am trying to measure the output power for BLDC controller, in order to calculate the efficiency of the controller. I came to know that two watt-meter method is one of the method used to calculate ...
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0answers
47 views

Current problem

I want to control 2 opamps to activate one circuit at a time so I designed an analog selector. Each circuit works very well. But when I connected them the voltage on the base of T4 jump to 17V. I ...
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0answers
26 views

Circuit to select from 2 inputs 4-20mA and 0-10V

I want to select one from the 2 inputs. if (BSP pressed) then output=0-10V else output=4-20mA. I used an and gate based on PNP and NPN mosfet but it didn't work. any suggestion plZ.
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0answers
16 views

Type A vs Type AC RCCB

I would like to install an RCCB at the electrical point that will power a few devices that are going to be in my fish pond. Documentation and general info online say that Type AC RCCB can work with ...
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0answers
34 views

Replacing Nimh battery to Li-ion in hybrid cars

is it a good idea to replace a Nimh battery in hybrid car (like prius model 2012) to Li-ion battery without any problems.
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0answers
66 views

Basic MOSFET small signal model with no load and Rd

I've come across the most basic small signal model of the MOSFET. We have a NMOS whose drain is connected to Vdd= 5V and source is grounded. We also have biased gate with a DC 2V. Suppose the ...
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1answer
40 views

Protecting equipment submerged in water against earth fault - RCCB vs MCB

I would appreciate help understanding the difference between an RCCB and MCB in the context of the situation I'm sharing below. I have a mini fountain pump in my pond which doesn't have any earth pin (...
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1answer
20 views

How much high is the amplitude of stator-MMF of 3-phase 2-spp integral slot winding type machine as compared to 3-phase1-spp machine of same type?

Details: No. of POLES=2; i.e 1-pole pair SPP= slots per pole per phase In my case, amplitude of MMF of 3-phase 1-spp machine= 0.75; Then what should be the amplitude of MMF for 2-spp machine ? Is it ...
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0answers
54 views

Consider lowering VDD to save power in a static CMOS gate. Also scale Vt proportionally to maintain performance

Will the dynamic power consumption go up or down? Will the static power consumption go up or down? Explain with proper analytics. I came accross this question while solving a question booklet issued ...
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1answer
45 views

Garage door openers - BLDC x AC monophasic - Is that possible?

As far as I know, electronic control boards for garage doors, they basically control two main types of motors: AC induction monophasic, one neutral and two phases, driven by TRIAC or relay. It takes ...
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0answers
31 views

All three indicators of a Spike guard/ Spike buster shining leading to shock like sensations

A standard Spike buster/ Spike guard has 3 LEDs in a horizontal line to indicate if the connections are OK, open or reversed depending upon which one or two of the LEDs are shining. This information ...