Questions tagged [electrical]

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0
votes
1answer
321 views

Digital compatibility of logic gates

I started an applied electronics course at my university and my teacher assigned us this assignment after a lecture on how to check the compatibility of two or more gates: Output electrical ...
2
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1answer
619 views

Bjt circuits, “Vbe = 0.7 at edge of conduction”

could you explain what "eoc" and" eos" (edge of conduction and edge of saturation) is? The problem says "Vbe = 0.7 at edge of conduction" , is that in cutoff mode?
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1answer
151 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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3answers
99 views

POKO TD-169C Hair dryer circuit diagram

Can I replace the 1N5395 diode in this diagram with a FR157 diode? Basically I need to lower the heat of my hair dryer and I think the 1N5395 diode in this diagram does exactly this but I have only a ...
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3answers
75 views

Can I splice a standard AC power plug onto a 2-pin DIN table lamp cord?

I've acquired a table lamp with a 20W 12V bulb (possibly from IKEA?). The cord terminates with a female 2-pin DIN (41529) connector that I do not have an adapter for. Am I correct to assume that it ...
1
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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 ...
2
votes
1answer
32 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?
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1answer
55 views

5 VOLTS 1 AMP TO 5 VOLTS 500 MILLIAMPS [duplicate]

I HERE'S MY ISSUE... THE CAR STEREO HAS A USB PORT OF 5 VOLTS 1 AMP, AND MY PROBLEM IS WHEN I CONNECT A USB MEMORY STICK IT "BLOWS" THE CIRCUITS (MAKES THE USB UNREADABLE), ITS MY SECOND USB ...
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0answers
36 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.
2
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1answer
149 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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3answers
114 views

What did I do wrong - recharging sealed lead-acid battery with recycled computer PSU

Today I took an old computer power supply, stripped the yellow +12v and the black ground, and twisted half of them together each into 4 separate pairs. I then took a lead acid battery, which seemed to ...
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5answers
1k views

What is the best way to convert a 10V power supply into a 5V power supply?

If you were given a 10V power supply and wanted to power USB devices with it, how would you convert it to 5V? Would using a voltage divider splitting it into 2 5V lines be the best? What ohm resistors ...
1
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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 ...
2
votes
1answer
60 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 ...
2
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1answer
53 views

electronics simulation circuit

I am learning to draw electronics circuits and trying to identify the voltage and current behavior at different points of the circuit. When learning from the internet I find simple to complex ...
1
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1answer
601 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 ...
2
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3answers
485 views

How to figure out what resistors are in the E12 and E24 series?

Is there a way, other then remembering, to figure out what resistors are in both of these series?
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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, ...
1
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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.
1
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1answer
162 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 ...
1
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2answers
31 views

Normally Closed, 24V DC, 1/4 NPT Female, 1.4 Cv solenoid valve power supply

I have a solenoid valve of Normally Closed, 24V DC, 1/4 NPT Female, 1.4 Cv, 500mA max current drawn. Can somebody verify the power supply requirement. would this be an ideal power supply unit for the ...
0
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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
65 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 ...
0
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1answer
30 views

Oscilloscope not visible in PROTEUS simulation

I tried simulating astable multivibrator using OPAMP. At one instant i got the oscilloscope but wasn't able view the waveform. I tried running again but this time there was no oscilloscope visible. ...
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2answers
281 views

Can we use the Halbach array configuration in an electromagnet?

I tried asking this question in several forums but didn't find any answers as i expected. It's very hard to find information about halbach array in google, especially in the electromagnetic field. We ...
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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
25 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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3answers
58 views

How to find rated voltage of a machine?

I am trying to understand what a rated voltage/current/power mean for a machine. when I google it, I typically get information on how to find it from nameplate, but I am trying to understand it ...
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2answers
81 views

Ground Earth Resistance explained in electrical system

I have several questions about the electrical systems used in the field and the grounding mechanisms. So, as far as I understand there are multiple systems that can be used to distribute electrical ...
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2answers
46 views

Avoiding battery charge interception with high-current devices

I could use some help to certify an assessment of an ongoing automotive issue. The vehicle is equipped with a high-performance electrical fan (40 amp draw/10 AWG), and I suspect that existing wiring ...
-4
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2answers
163 views

What are the two sensors doing in the automatic bread production line? [closed]

I want to know what is the name of these 2 sensors and what function they perform Some of you were complaining about the picture quality. It is the highest quality image I can get. Also these sensors ...
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0answers
30 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.
0
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1answer
66 views

The constant time value for an electronic device [closed]

i am working in a data science project that require certain information about electronic devices. So I know that for each electrical circuit there is a permanent regime and a transient regime and ...
0
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0answers
65 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 ...
2
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2answers
64 views

How to select a Relay that can handle a load of 42V, 3A DC?

I want a relay that can be controlled by a Raspberry Pi and can handle a load up to 42V and 3A DC. I was looking at this: relay which is rated at DC 30V/10A. Although, 30V is less than 42V but I was ...
3
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4answers
939 views

What is a ground fault?

Is this different to a short circuit and if so then how? Because some circuit breaker protect from both short circuits and ground fault thanks, so when do u need to protect from them and when don’t ...
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1answer
44 views

Is it possible to use adapter as a charger? [closed]

I have a 8V battery and a 5v,600mA output adapter. so i needed to charge the battery using this adapter,is it possible? when i connect my battery to adapter, the adapter power led is glow. is it safe? ...
1
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2answers
78 views

Led ON on Spike Guard Even When Switch is OFF [closed]

I have this spike guard and it's middle led is ON even when the spike guard switch is off. I can see there are various combinations of the led and their meaning. But I see the middle led on when the ...
0
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1answer
39 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 (...
0
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2answers
207 views

OpAmp Comparator Circuit Design for High/Low voltage measurement

I am new to this. I want to make a circuit to measure the voltage from (0 ~12 V), which can have 2 op-amps as comparator to give the output positive, when the voltage goes from 8 V to 12 V and give ...
1
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1answer
115 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 (...
0
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2answers
82 views

Relay always damaged in switching circuit

I have a simple relay switching circuit which is used to turn off/on the power supply to a laptop. SPDT Relay is 8A , 440AC part number--> G2RL-24DC. The relay always gets get damaged - the ...
0
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2answers
157 views

Is there a requirement for Electrical Design Engineers to show all his/her design computation/analysis used on electrical plan?

There was a Terms of Reference requiring to provide 100% back-up Power on all residential units of a building. However, I noticed that the design-in-charge do not include provisional loads on his/her ...
0
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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 ...
1
vote
1answer
42 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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2answers
38 views

Insulate active or neutral?

If you can only insulate active or neutral, which should you choose? Does it matter? Is it important? Is one better than the other?
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3answers
81 views

3.7 V to 12 V boost converter - effect on cell

If I boost a 3.7 V 18650 battery to 12 V with a boost converter, would it affect the durability of the battery? For example, if I have a 2100 mAh Li-ion boosted to 12 V, would it affect the 2100 mAh ...

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