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Questions tagged [circuit-analysis]

Circuit (Network) analysis is the process of finding the voltages across, and the currents through, every component in the network.

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Finding equivalent capacitance and resistance from DC circuit with combinations of R and C

In order to get the simplest RC circuit and get equivalent circuit tau: How can be its transient studied if before t = 0 there only exists one resistive part of circuit? I's obvious that before t = ...
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What does “driven” or “driving” mean in terms of electronics?

It is a silly question to ask, but I keep seeing statements like "driven by the output signal" or "X drives the load". What does it mean to drive or be driven by X?
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Under which specific (formal) conditions can I apply the superposition theorem?

Superposition theorem fails when you have two ideal (identical) voltage sources in parallel. Under which specific constraints can I apply it? I have read that, in DC Circuits, superposition requires ...
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Headphone Jack Detection Mechanism?

I am trying to build a circuit that turns on a speaker when headphones are unplugged (so it like how our phones detect when our headphones are connected). To do this, I was thinking of simply using ...
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58 views

Where exactly appears the channel capacitance and Ron when switch on DG442 switches

I have this switch in a circuit, actually there is 30 switches. https://www.vishay.com/docs/70053/dg441.pdf When system is not executing any operation, switches are off. Sx and Dx are not connected. ...
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Differential Equation of RC Low Pass Filter

I'm trying to analyse the following circuit to find the differential equation describing the relationship between \$V_{in}(t)\$ and \$V(t)\$: Where \$C_1 = 2uF\$, \$C_2= 1uF\$ and \$R_1=R_2=1k\Omega\$...
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How the frequency of oscillation is determined in a multi-resonance oscillator circuit?

If we have a self-oscillator with multiple resonant frequencies, what are the criteria for the preferred frequency of oscillation? For example, a push-pull oscillator with parallel-compensated two ...
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593 views

Why is the collector current I_c for a normal common emitter BJT circuit LARGER than that of the Darlington transistor circuit configuration?

I'm a noob to electronics and have been reading up on transistors. I tried to simulate Darlington (NPN) and Sziklai transistor and compare them against a single common emitter NPN configuration, ...
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32 views

RC integrator+ BJT emitter follower

i am designing a circuit able to draw IV curves of LEDS and diodes through Arduino. Basically i use the PWM function and an RC integrator to have an approximately constant voltage. Then i would ...
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46 views

How to operate 1602 LCD on 3.3V [closed]

I wonder if its possible to run a common 16x2 LCD with 3.3v power supply. Its datasheet shows supply voltage = 5V. Are there any 3.3V variants of 16x2 LCD modules?
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How to combine a LPF and a Voltage divider?

I have to connect a 5V analog signal to a 3.3V MCU analog GPIO input as shown in the attached image. I wonder if its possible to combine the 2 blocks of voltage divider and RC-LPF into a single block? ...
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75 views

Display input from multimeter on PC

I have opened a Multimeter (Model:DT830D) and I want to take the input that is fed to the LCD display and display it on my PC instead using the serial monitor of the arduino. But I am confused about ...
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58 views

Thevenizing a Circuit when current through load is a paramter

The question is to find the current i in the following circuit. simulate this circuit – Schematic created using CircuitLab My Attempt: I considered \$10\:\Omega\$ resistor as the load. ...
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50 views

Calculating Short Circuit Current when Nortonizing a Circuit

My objective is to find v (voltage drop across 8 ohm) in the below circuit. I was able to thevenize the circuit successfully (V thevenin = 12 V and R thevenin = -2 ohm) and find v. But I find it ...
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27 views

Thresholds in Static discipline

The Voltage thresholds \$V_{OH},\ V_{OL},\ V_{IH},\ V_{IL}\$ as far as I understood, they represent, \$ V_{OH}\$ ~ The sender must produce a voltage above \$ V_{OH}\$ for sending a \$1\$ \$ V_{OL}\$...
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How to read a multimeter (digital) — should I get 2A readings from a couple of AA batteries?

I have been using some old multimeters in a high school science lab. We did a current an voltage reading from a AA supply (two batteries) with a variety of resistors. In some cases a 1M resistor. I ...
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41 views

Proteus voltmeter value in simulation not right

I'm really new to Proteus, so if I'm doing something very wrong, sorry. I'm messing around with the Proteus simulation but I don't understand why my voltmeter has given me a value when the circuit ...
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83 views

How do I connect a four way key in a potentiometer?

I asked this question in Physics stack exchange and had an answer, but I couldn't understand it well. A comment said this stack exchange was a better fit for the question. Question: How do I connect ...
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51 views

Deriving Capacitor Current Equation

I understand that the current through a capacitor is given by the capacitance multiplied by the rate of change of voltage. I also understand that this leads to infinite impedance for DC and virtually ...
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101 views

Nodal analysis -> transfer function -> step response

I've been trying to get the transfer function for the circuit in the image below, but I seem to be doing something wrong, since the simulation on Circuitlab gives me a different Bode plot and I can't ...
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60 views

Faults in a RLC circuit

Suppose we have a classic RLC circuit, in series and with constant voltage. Let's suppose that the resistance, the inductance and the capacitance can be affected by a fault. For which components can ...
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58 views

Desktop PSU registering signal from 220ac input [closed]

Question: Do "current+old" generation desktop pc's have any built-in means of registering a signal that is modulated on a (220v) AC power output? Application/context: Suppose your energy company ...
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Finding the average power dissipated in a resistor

Well, I've a series RL circuit that is powered by a voltage source. The input voltage is given by: $$\text{V}_{\text{in}}\left(t\right)=50+\frac{400}{\pi}\cdot\sum_{\text{n}=1}^\infty\frac{\sin\left(...
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1answer
87 views

Generating a constant-amplitude triangle wave from a square wave

I have designed a circuit that can generate sawtooth and arbitrary duty cycle pulse waves controlled by some variable DC current source \$I_0\$, giving a frequency proportional to this current. The ...
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Matlab: Solving homogenous set of linear equations based on Kirchhoff's circuit laws

I have got the following equivalent circuit of a common source amplifier from which I want to determine the expression for the voltage gain A = VD/VG. Because I have pretty much more difficult ...
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In an AC coupled Op-Amp circuit where do input bias currents flow from?

If we have an AC coupled amplifier like the one below, i've read and been told it needs a DC path to ground to allow input bias currents to flow, though I just can't get my head around this, I bias is ...
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I'm having trouble understanding the properties of this circuit

The objective of this question is find beta, which is ( Ic/Ib) The 3V is supposed to be 2.3V The 27 k ohm is supposed to be 20k The 230 ohm is supposed to be 230 ohm I first found Ib = 4.3 v- 2.3v /...
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50 views

How can I simplify my design for a Surge Protection Device (SPD)?

I have found a basic design for a SPD and I would like to simplify it. However, I have little experience designing SPD circuits. This is my parallel type SPD circuit with embeded LED indicator: In ...
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How to find the resistance of a diode operating in reverse breakdown region?

I am tasked to find the small signal resistance of a diode operating in reverse breakdown region (not forward bias). Method 1: Is using the small signal resistance formula correct even in the ...
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1answer
114 views

Please help me understand this bjt set up works

This is part of an automotive timer (NOT a 555!) that we have at work. Because I'm extremely bored I'm challenging myself to understand how this one operates. I've spent about 1.5 weeks with tutorials,...
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5answers
162 views

why does RC time constant happen to equal 1/e?

I understand that the time constant in AC RC circuits is defined the value of resistance (in ohms) x the value of capacitance (in farads). Indeed, ohms(R) x farads(C) yields time (seconds). $$\tau ...
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What is the point of the zero ohm resistor between LED_VCC and VCC_3V3?

I am designing a IR sensor transimpedance amplifier circuit based off of the Texas Instruments Particle Sensor (TIDA-00378). Between the separate power buses (LED,TIA,VCC) there is a connection with a ...
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59 views

Replacing a charged capacitor with suitable components to form equivalent circuit

If we have an initially charged capacitor (say 5V) and capacitance C, in a circuit, can we replace it with a constant voltage source of 5V and an uncharged capacitor with same capacitance C, both in ...
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26 views

Symmetrical Component Analysis Circulating Current & KVL

I was reading in John Grainger Power System Analysis and have a question in mind. Below is the delta connection of an unbalaced 3 phase system with unsymmetrical loads $$Z_{\Delta 1} \neq Z_{\Delta 2} ...
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CAN Transceiver Behavior during fault conditions

I was just trying to understand the CAN transceiver TJA1042T behavior during fault conditions: CANH short to BATT CANH short to GND CANL short to BATT CANL short to GND I'm powering on the ...
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Can you connect multiple photodiodes in parallel and treat it as one?

Im working on an IR sensor based off of the Texas Instr. particle sensor (TIDA-00378). They use just one photodiode in their design. I would like to use multiple photodiodes, lined up with multiple ...
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How to reduce resistor power consumption?

I've started learning about transistors and was working on this circuit, and have fiddled around with the circuit simulator for a couple hours, but can't seem to find an efficient design for what I ...
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2answers
70 views

SparkFun Sound Detector Circuit Analysis

I would like to request some help in analyzing the op-amp circuit used by SparkFun here. I'm particularly interested in the pre-amplifier portion of this design. The write-up included by SparkFun ...
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Voltage Controlled Voltage Source Circuit Analysis

I don't know what I'm missing with the analysis of this question. Obviously I know that there's no voltage through the 105k resistor. I know that the current from the VCCS is given by the input ...
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63 views

Network Resistance equivalent

simulate this circuit – Schematic created using CircuitLab I am having difficulties in simplifying and finding the equivalent for the circuit shown. Can someone guide me to the appropriate ...
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What tools can I use for parametric circuit analysis?

I have analog circuit designs that I want to analyze for accuracy, etc. according to the component variations based on tolerance, temperature, etc. To elaborate further, imagine there is a circuit ...
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TI Photodiode Trans impedance amplifier Circuit?

I am designing a Photodiode(Vishay/ current of 15uA) circuit amplifier (TI ) in SIMetrix. frequency of Photodiode is 1MHz. I choose an Amplifier from TI as OPA355_Q1(spice model imported from TI) and ...
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42 views

AC Circuit Analysis with Diodes and Op-Amp

The following circuit is given: The 2 diodes are idealised in the following way: All other parts have the following properties: I've been trying to figure out what the voltage at the entrance of ...
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957 views

What is wrong with my KVL approach on a really simple circuit?

Hello, so this is a really simple circuit question that has been bothering me. I know that by simply looking at the circuit and using logic it makes sense that the voltage drop across the resistor(as ...
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74 views

Phase Shift due to Capacitor

Consider the following circuit, Running an AC simulation, Now consider this, Running an AC simulation, How come with the RC circuit, we have a constant -90 phase shift. I don't understand how the "...
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How should I go about reverse-engineering this printhead?

I'm interested in using the Epson FA04010 printhead in a project. I'm pretty sure it uses piezo-based inkjet tech, and I can see in the product images it has 21 pins. I can't find any specs at all for ...
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Fixed a garage remote by breaking it

I have a garage remote that stopped working. I changed battery and it worked again, but only for a few days. I measured the resistance between the poles of the battery terminals and it was about ...
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Nodal analysis using supernode tough problem

Hi I am stuck on the following problem: I know I have to use a supernode but I dont know where to put it.
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120 views

Capacitor Voltage in RC Network Circuit

I am understanding a rc network shown in the above image . I need to calculate the Value Vc after i give 24 volts step input for 16 μs. i used capacitor charging equations Vc=Vinput(1-e^-t/rc) ...
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61 views

Potential difference between these points

I do not know how to approach this problem or which theory to apply. Could you please help me to find out the potential difference between the points A and B in the circuit given below.