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Questions tagged [electrical]

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38 views

Class F and inverse F power amplifiers

These amplifiers tend to shape the current and voltage waveforms using their respective harmonics . The goal is to minimize the area of overlap between drain (or collector) voltage and drain current ...
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1answer
94 views

Electronic Circuit Breaker

I want to protect from short circuit by using a miniature circuit breaker. But this has to be manually turn ON, when ever it is turned OFF. So I was thinking to make a electronic circuit breaker which ...
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2answers
51 views

Make a Latching double pole single throw relay, using electronic components

I am latching a DPST relay. So I made a prototype using some transistors(ex. BC547) to enabling and disabling the latching. But I want to know whats the correct way of doing it. I have both 12V and ...
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0answers
53 views

Need help with capacitor

Hello I have a circuit here that turns on an led when the switch at the bottom opens up. My first problem is that I would like a NO push button that turns off the LED when it’s hit. But I would also ...
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2answers
180 views

Why is the capacitor in this circuit not becoming an open circuit?

In this circuit you can find an RC circuit and 4A DC current source. I thought that if we use a DC voltage source instead of a DC current source, this circuit would become open circuit after a while. ...
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1answer
74 views

In this circuit, why the first capacitor cannot be “open”? [closed]

In this picture, you can find first capacitor and i did simulation by using matlab simulink and then i measured the current flow to the first and second capacitors. i think that capacitor will be ...
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37 views

Can electrodes be used to transport currents generated by piezo crystals floating inside conductive gel

I have an idea and want to know if this is feasible. The idea is to put little piezo PZT crystals inside a conductive gel, the gel itself is contained by a membrane which receives stress from outside ...
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1answer
39 views

Calculation of a feedback resistor in an inverting shmitt trigger

This is taken from a frequency counter circuit based on a schmitt trigger comparator . The frequency counter has a noisy immunity threshold of 100mV. How would you calculate the Rfeedback resistor ...
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1answer
35 views

Power Amplifiers operating in Saturation and VSWR issues

Are power amplifiers operating in saturation more immune to VSWR effects than their counterparts operating in more linear mode and if yes why?
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0answers
47 views

Master switch for mutually exclusive branches for pump controller

To put things in perspective, I'm trying to install an automatic pump controller at my parents' place, and I'm not an electrical engineer. Unfortunately, I have been unable to identify a knowledgeable ...
2
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1answer
67 views

How to measure Johnson Noise precisely experimentally?

I want measure Johnson Noise across a resistor having certain over the certain range of frequency or bandwidth practically. I am starting from scratch, how can I build circuitry and instrumentation so ...
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0answers
49 views

what is relation between Electric field intensity (E), Electric flux (Ψ) and Electric flux density (D)

As we know: Ψ = ∫E.dS By Gauss's law Ψ = ∮E.dS = Q / ε ε = permittivity of material inside Gaussian surface Q = enclosed charge in the Gaussian surface Ψ = total electric flux passing through ...
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1answer
33 views

How to identify source and load in AC network?

If I have a AC network with two black box components connected with each other and I can tap into all voltage and current measurements, how do I determine which component is the source and which is ...
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2answers
80 views

Reduce/Remove Sparks in AC and DC Contacts of Relays

I see that there are sparks being generated whenever there is a connection established between two contact points in the relays. So is there a way to reduce/remove those spark generated in the relays.
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1answer
35 views

fan speed regulation causes other loads flickkering

I am using traic based dimmer circuit for regulating my ceiling fan. when the fan is regulated to low speed the other loads(incandescent,tube light,LED) in the room are flickering. when i increase the ...
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0answers
19 views

Does zero sequence current flow in line to line faults?

Assuming that there is a prefault load on a line,does zero sequence current flow during phase to phase faults ?
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1answer
130 views

Many three phase Identical motors connected in parallel but have different speed why? [closed]

My teacher asked me a question that many identical three phase motors are connected in parallel with same rating and also mechanically they are same but there is 2 motors which was running at slow ...
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1answer
56 views

Is heating the nichrome wire with phone battery possible?

I want an nichrome wire to heat instantly red hot when connected with phone battery using 2 copper wires. Do I need any extra circuit to convert the volts into current for heating? (H=I^2Rt) Would ...
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1answer
56 views

How to detect electrical leakage in water tank?

I have a 50cm x 50cm x 80cm water tank and I am heating water with two 1500 watt water heater resistances. I think they are stainless steel or chrome plated but I am not sure about it, I can't contact ...
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0answers
29 views

Master Control Unit Design

I am designing MCU Board with four layers stackup 1. signal. 2. GND. 3. PWR. 4. Signal This board will supply six Radar sensors each with (12V and 4A maximum current), this board have a power ...
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1answer
46 views

Mapping two characteristic curves of a power amplifier to each other

How van these 2 curves shown below map to each other: So where would point B or point A on the IDD vs VDD curve be on the power output vs power input curve?
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2answers
129 views

Can a low amps 48v battery handle big DC motor

I have a 48V DC motor, 3500W at 300A, combined with a dc controller with 60A constant and 120A peak discharge rate. Can a 48v li-ion battery with 20A constant and 40A peak discharge rate, safely ...
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1answer
43 views

Identifying Correct Power Cable Extension

I have the following power cable for a projector: I need either an extension for the part that goes in to the projector (with the yellow pin) or a whole new power cable and block with a longer cable ...
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2answers
54 views

How do we reduce or nullify the back current from the wheel motors of the modern electric vehicles?

As expected, this EMF opposes the voltage of the source that created it; that is, the motor becomes a generator as soon as it is turned on, and the opposing (or counter, or back) EMF will increase ...
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2answers
46 views

Digital predistortion of bipolar power amplifiers

What is the peak power limit of a signal beyond which a digital baseband pre-distorter will not be able to correct for nonlinearities: P1 dB of an amplifier? P3 dB? and why is there a limit?
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2answers
39 views

Calculation of Relay current

I am using Relay OJE series SPST and I want to drive the relay with V=5v and the resistance through the coil is 125 ohm. From microcontroller 3.3v and 1k resistor. The NPN type is BC817-25 and the max ...
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1answer
33 views

Confusing regarding sub domains of main specializations EE?

I want to apply for masters program in Hungary in EE As shown attached snapshot, there are listed 3 secondary specializations: Smart city Smart systems integration Optical Communication I know ...
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1answer
85 views

Does cutting the covering of subwoofer wire affect the sound quality?

I have Sony 5.1 channel sound system. There is some cut on covering of subwoofer wire. The copper wire is not affected at all. So, I am curious to know whether it will leak the passage of sound and ...
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1answer
63 views

Crock pot on power inverter

I have a slow cooker crock pot thats uses 120 volts AC which range from 0.6 amps to 2 amps and consume electricity that ranges from 70 watts (low temperature) to 250 watts (high temperature). When I ...
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0answers
30 views

UPS vs Surge Protector regarding short circuits and quality of power

I did research before posting and it seems a UPS filters power so that it is constant and “filtered” additionally it seems to be able to protect against short circuits. Does a surge protector have ...
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0answers
48 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
24 views

Battery Charge and Discharge Time Calculations

I am performing some calculations but struck with confusion whether I am doing it correct or wrong due to contradictions of these calculations on different calculators websites. I hope here someone ...
1
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1answer
69 views

Distance and voltage/watt loss?

I have read multiple posts on here regarding voltage/watt loss but I wanted to see how it would apply in this situation that I can not seem to solve using available resources. Maybe I just do not ...
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1answer
55 views

Can I change the battery connector on this model aircraft safely?

I am working on a project, and am required to build an autonomous glider (no propulsion). Weight is limited to 9oz, and we are using the Pixhawk 4 mini for flight controls. The power management board ...
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1answer
43 views

How do you wire a Marx Generator?

I have seen videos of people actually being able to power on a Marx generator with no problems whatsoever but however they never show the complete setup and diagram of their circuit and real physical ...
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1answer
59 views

First design with EEPROM

I want to get an idea of how to use a chip, code it and burn it. So an and gate could be a good choice. I've thought about using AT27C01024-70PU or AT89LP4052-20PU. Got this burner in mind: https://...
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4answers
74 views

How does energy dissipates in a purely reactive circuit?

Suppose in a home, power factor drops to zero. It means that the circuit becomes purely inductive. If the energy meter is connected at incoming power supply point,will the energy meter still keep on ...
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1answer
36 views

Solar Module Voltage when bypass diode activate?

What happen to the voltage level when a solar module is shaded and one of its bypass diode is activated? Assuming this solar module has 3 bypass diodes. I have been reading and can't seem to ...
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1answer
36 views

How to prevent circuit from shutting down when motor drain too much power

I have a device which has motor and circuits with PLC. This device is connected to a 12v battery which is powering the PLC and motor. Everything is working fine but when the motor's load is heavy, it ...
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1answer
36 views

Noise in transmission system

Does external noise (not electrical noise) affect system voltage? If so how does a source of sound energy distort a voltage waveform? https://youtu.be/4TCnYYpZxEc What exactly is happening in this ...
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1answer
132 views

Will resistance of wire increase with age due to some effects?

Today I had an electrical problem at my home not yet resolved. I will explain the problem. The switch for water motor and switch for lamp are nearby in same board. When I turn ON the lamp switch, the ...
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1answer
57 views

Oscillator connection

I have two questions here for how to connect the oscillator to a microcontroller (SPC584b): How can I determine the values of the capacitors? What is the need of SB2 & SB3?
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0answers
43 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
75 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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0answers
33 views

Superposition analysis with VCCS

I have just started doing electrical engineering course in the university. And I really don't understand how to treat those dependent sources when doing the superposition analysis of the circuit. Here ...
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0answers
60 views

Thyristors problem in a 1800v capacitor discharge system

I have two thyristors “R1275nc21x, they are Westcode thyristor and have some issues in my application. I want to make a capacitor draining system with 1800V charged and it can discharge to the coil (...
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2answers
50 views

Does ideal Transformer transfer DC input voltage to secondary side, under NO-Load and Loaded condition?

Does ideal Transformer transfer DC input voltage to the secondary side, under NO-Load and Loaded condition? please you take DC input for a long time. Also consider two more conditions, 1st: for ...
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1answer
58 views

whats voltage drop on 40 yards of ws2815 leds

We are working on a project of using ws2815 led strips and our concern is how to handle the voltage drop?
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3answers
103 views

Is the electric current delayed

simulate this circuit – Schematic created using CircuitLab -Suppose that the distance between "D1" and "D2" is too large. -Does "D2" give a delayed response compared to "D1"?
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0answers
66 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 ...