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Questions tagged [circuits]

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2answers
78 views

Circuit To Measure Phase difference

Is there any classical analog circuit to measure the phase difference between two analog signals ( especially sinusoidal signals )? I want to measure the phase difference between two sinusoid signals ...
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3answers
117 views

Do the resistors affect every component of the circuit?

I've noticed something strange in the circuits schemes I saw in a book. Let's say that there is an LED and it's anode is connected to a 5V power source, and it's cathode is connected to ground. ...
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2answers
103 views

How does this precision full wave rectifier work?

I am making a VU meter, and I need to rectify the audio signal for the IC comparator chip. I found this circuit in the datasheet, but I am unsure of how it works. I understand that the LF351 op amp ...
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1answer
64 views

Stabilizing IR Emitter/Receiver circuits

Need some help making these IR Emitter/Receiver circuits, and their power, more stable. Building a large, 8’ x 10’ LED art installation (in progress details included). LED Butterflies in a grove of ...
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1answer
131 views

Fourier Transform vs. Laplace Transform?

The question arose to me earlier, and I never really understood it.. What is the difference between fourier transform and laplace transform in terms of analyzing an overall circuit? I don't quite ...
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1answer
33 views

Series/parallel combination of resistance/capacitance in an RC circuit (wrt LCR meter readings)

I have this equivalent circuit I am working on. I have to find out individual values of all components in it. I can measure resistance, capacitance and impedance of the whole circuit. I am not sure ...
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0answers
46 views

Superposition theorem for transient analysis

Can we apply superposition theorem in transient analysis of circuits? I don't think it can be used since during transient state the input and output relation is not linear and is rather explained by ...
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3answers
113 views

AC through inductance only

How will we have a current through a pure inductive coil connected with ac power supply? I am confused because the induced emf will be equal to the applied voltage but opposite in direction, \$emf = -...
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0answers
59 views

Designing Bandpass filter with bandwidth and center frequency given?

I'm having trouble determining RLC values for a bandpass filter with these given values: Bandwidth: 73 kHz Center freq: 4.8 MHz I use equations \$B = \frac{R}{L}\$ & \$f_{center} = \frac{1}{\...
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1answer
54 views

Trouble analyzing BJT circuits when we change β from very high to 100

For example we have this circuit: Originally we assumed β to be very high and we assume VBE = 0.7. So for this, we have IB = 0 and therefore V1 = -0.7V and V2 = 3.4V. Now that we have β at 100, IV1 ...
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2answers
104 views

will the difference between a .001 cap and a .0015 cap matter?

I am doing a build for a guitar stomp box from this website and was wondering if a .0015 capacitor could be used instead of a .001 capacitor. The build i got from https://www.tonefiend.com//wp-content/...
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1answer
65 views

replace ceramic capcacitor with electrolytic one

I need help, that i have a lack of ceramic capacitor value variety in my country. I need 47μF (microfarad) and 2.2μF (microfarad) ceramic capacitor and i can't get these values. So the question is,...
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2answers
30 views

Thévenin's theorem exercise, resistances

I've some problem identifying the \$R_{th}\$ simulate this circuit – Schematic created using CircuitLab Removing the load and short circuiting the Voltage source we get : simulate this ...
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1answer
60 views

Elements' order in a circuit

I was reading about source transformations and came across an example where there was a change in the order of two series elements, is this always possible? The same for in parallel elements but that ...
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1answer
41 views

Where does the indicated negative voltage terminal lie on this circuit?

Does the negative voltage terminal lie after the 150v source ?
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0answers
33 views

Common issue with full adders and its solution

So, I have taken this subject called "Digital Logic Design" for school. I have been going through my book's exercise questions(for my homework) and I found a question saying: There can be some ...
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1answer
108 views

RL circuit: How to determine the equivalent resistance of the circuit?

So I'm working on an RL circuit and the solution is stated to be that R1 and R3 are in series, but I didn't think that was the case because they don't have the same current through them. Given ...
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1answer
76 views

Black Box Measure

This black box show in the next figure can be created with logic gates, op amps, PIC, FPGA (Basys 2), nevertheless you can’t use any kind of digital - analog converter, the signal obtained on the ...
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1answer
138 views

I'm confused as to which resistors you include when calculating τ=RC, in an RC circuit?

In example 7.14, how come the Rf resistor is not part of the RC circuit...that is, why don't we need to include Rf when finding the time constant (RC)? [![enter image description here][2]][2]
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1answer
30 views

I need help understanding something from a RL circuit problem.

In the below example, why is the voltage source shorted for t>0, and why does it say "the 6-ohm resistor is shorted" in the paragraph about t<0? Isnt it open circuit there?
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2answers
85 views

What resistor to choose for circuit? [duplicate]

I'm not good at physics, but I'm trying to make a lantern. So I have an LED with this characteristics: N = 3 Watt I = 0.7 Ampere U = 3.4-3.6 Volt So I connect it to 6V battery, but need ~3.5 V. ...
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2answers
83 views

What is the impedance in a theoretical LC circuit?

While writing a paper about an experiment I am conducting, I was wondering how inductor-capacitor circuits theoretically behaved. In theory, we assume that wires and components that are not resistors ...
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2answers
45 views

Network Theorems on DC and AC

Are network theorems (KVL, KCL, Thevenin, Norton, Superposition, Max Power Transfer) applicable on both DC and AC networks
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3answers
70 views

How to find current in this circuit passing through 4ohm resistor

Below I have added my solution after the question so please let me know how I can solve it after the last step: These steps to follow to solve the question from where i left in my post , FYI :As ...
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3answers
134 views

Keep a circuit closed after activating a reed switch NO (normally open)

I need a circuit that it is open until I bring near a magnet that closes a NO reed switch for a short interval of time. I need the circuit keep closed for ever. Thanks!
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2answers
39 views

Circuit analysis with node voltage method

The problem requires I determine the value of I0, I think my solution is correct but I don't know how to check because I got the problem from a text with no answers. Looking for more experienced eyes ...
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1answer
842 views

How do I implement a sequence generator using a universal shift register?

How can I implement a sequence generator that generates the following sequence 0000 1000 0001 0011 0110 1101 1110 1111 using a universal shift register? The shift register I need to use is the 74LS194 ...
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1answer
57 views

understanding circuit protection

Ok so i'm hoping that someone can explain to me in basic terms: in an un-fused circuit what could actually cause an electrical component to be damaged by current flow. I'll explain the reason for my ...
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2answers
19 views

What properties can be changed to maximize a p-n diodes effectiveness at higher temperatures? [closed]

So the reverse bias breakdown voltage of a diode gets smaller as temperature increases. What can be done to change that? Can the concentration of dopants of the p or n layers be changed to make this ...
1
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1answer
67 views

Can the the rate of the flow of electrons (current) remain the same even though the number of coulombs differ?

I understand the concept of a current, and how current is defined by the amount of coulombs passing through a point in the circuit, per second. What I'm confused about is when it comes to parallel ...
6
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2answers
445 views

If there exists a cascade of op amps, does the previous op amp's slew rate affect the later op amp's slew rates?

All op amps used are the same Texas Instrument LM348n. The datasheet says the op amp has a nominal slew rate of 0.5 V/µs, but gives no tolerance. I have a square signal with an amplitude of 500 mV ...
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2answers
237 views

Common Mistakes Using Breadboard: What's Wrong? [closed]

I didn't wire my circuit correctly and burnt out all my LEDs. I put the resistor's nodes in the same 5 hole row and put each terminal of LED in separate rows. The LED lit up, but soon after blew up. ...
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1answer
62 views

How to monitor Voltage by a chip [closed]

I am making a circuit that would produce electric current. My question is that is there exists any chip that can monitor Voltage and if there would be current at specific voltage, the current would ...
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1answer
74 views

Is it safe to use DC power that you got from main lines for basic circuits?

Context: I have a project I want to do (just a basic circuit, like breadboard and LEDs and switches), and I don't want it to run on battery because it's going to be a decoration that runs a lot of the ...
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1answer
712 views

Diode-connected PMOS

Im currently a year 1 electrical engineering student. May I ask, for a diode-connected PMOS (gate connected to drain), why is |Vsd| = |Vgd| ?
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3answers
246 views

Why does voltage stay the same regardless of resistor connect to the source

I'm learning about clipping circuits, and I have hit a road block with my understanding of one particular problem. The circuit in question is a serial limiter. My issue is why does the output voltage ...
1
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1answer
595 views

12v DC to USB type C

Considering that USB C can output up to 20 volts and 5 amps, what would be required to wire up a 12 volt battery to a usb type c female port? I want to charge my phone using my motorcycle's 12 volt ...
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0answers
129 views

Phasor diagram problem

I am trying to solve this problem. I tried to use phasor diagram but I did not go far with it. Can anyone help me? In the figure below a generator with a voltage of 120 volts, RMS, is feeding a load ...
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0answers
34 views

Altium - Simulation of different circuits in the same project. What's the better way?

I'm working on a circuit simulation to understand the effects of the presence or absence of a determinate schematic parts. For example, I have one section with an high-pass and a low-pass filter ...
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4answers
1k views

I don't understand clearly why the ideal sources that the value doesn't match can't be connected

I'm studying recently Electric Circuits (9th edition) by Nilsson. In Chapter 2, an example bothers me. simulate this circuit – Schematic created using CircuitLab I don't understand why these ...
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1answer
201 views

Basic Theory - finding voltage between two points

I'm a neophyte here trying to learn using "Practical Electronics for Inventors, 4th Edition" (which received almost a 5 star review with over 500 reviews on Amazon). The preface of the book states "...
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2answers
139 views

Overshoot Before Transition

First of all, a little bit of context: I'm designing a single-supply Howland current source using the OPA357 (rail-to-rail 200MHz OPAMP) to delivery 100uA of AC current up to 1MHz. In one of my ...
2
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2answers
113 views

How to use an Arduino to turn a supply voltage to another device on and off?

The Question: With what kind of extra components if needed, can I use to output a signal out of one of the Arduino pins to turn the voltage on and off to a device. The goal is to output a HIGH or LOW ...
2
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0answers
138 views

Tricky AC power Question

Greetings all, Just to be clear, I am not asking anyone to do my homework. I am simply asking for guidance and or to clarify any conceptual errors I am making. For the following question, ...
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0answers
142 views

4mA - 20mA Control Circuit

For a personal project I'm using 4 proportional valves. To control these valves, I've implemented a control circuit. The function of this circuit is that, depending on the voltage input (range of 1V ...
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1answer
679 views

Find equivalent resistance at terminals a-b and c-d in the given circuit

I tried delta-wye transformation, which hasn't worked for me. Plus, I don't understand how to solve for two different pair of terminals, all problems before this had only one pair of terminals.
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1answer
379 views

Would these components work for a Nixie tube power supply?

recently I have been trying to design a custom nixie tube high voltage power supply. I've come across this youtube video https://youtu.be/kNBPaFiHbt0?t=5m45s, and at 5:45 there is a nice view of the ...