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Questions tagged [linear]

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2
votes
2answers
130 views

Power Supply Design Help- failure at higher currents

I am trying to design a 60V 6A supply to power a power amplifier. Here is the circuit I have so far. Feel free to open it in Circuit Lab and play around: simulate this circuit – Schematic ...
0
votes
1answer
44 views

DIY 3-phase fast linear actuator

I have a need for a FAST linear actuator of which I may control position and speed reliably. I have already been looking into pnuematics, however it does not seem that this will fit my needs (I am ...
0
votes
0answers
28 views

Linear antenna: with electromagnetic coil, trap circuit

I am trying to understand the concept of the linear antennas. I have read that the linear antennas are the simplest form of the antenna in the case of asymmetrical (coaxial) feed. what happens if I ...
0
votes
3answers
110 views

Use 5v Linear Regulator and LDO 3.3V

I am designing a PCB with a STM32 microcontroller, a GPS, DataLogger and X-Bee module. The power supply is a 12V Battery. So in my project I need 5V and 3.3V, at the same time. I don't know if it is ...
1
vote
0answers
56 views

Linear Regulator Operation

I have a linear regulator with three pins. It's identifier is LM7805. I've taken a look at it's datasheet and it looks unlike linear regulators I've encountered. Is the the op amp circuit included in ...
1
vote
1answer
37 views

How to obtain the steady state response of the sampled periodic signal data?

Below the green plot Vin is 5Hz sine voltage signal from a function generator output sampled at 12kHz sampling rate: The blue plot Vout is the processed/filtered data by using the following code in ...
0
votes
1answer
27 views

Adding dependant sources in LtSpice (CDCS)

I have the following schematic of the circuit, I wanted to added I2 as a Current Dependant Current Source depending on current on in V1 as three times the value, or, I(I2) = 3I(V1) I have tried ...
0
votes
0answers
41 views

Alternative to Microchip LR8 High Voltage Linear Regulator

I'm part of a Formula Student (FSAE/FSUK) team which is a global competition that runs every year in which each university designs and builds a racing car. We're in the electric vehicle category. As ...
0
votes
1answer
39 views

what is the max voltage that a cordless phone may handle above its original rate? [closed]

I am familiar with the fact that,today,most of the cordless phones have smps adaptors,which supplies a constant voltage to the base unit(opposed to the unregulated linear adaptors,which their rated ...
2
votes
6answers
173 views

Converting 0-5 volts (linear) to +2.5 — 0 — +2.5 volts (“vee”)

I'm trying to find a simple way to convert a 0-5 V output from a joystick hall effect sensor to +2.5 -- 0 -- +2.5 V. Here's how I want the response to look: The output voltage will be sent to a ...
0
votes
1answer
81 views

LDO, linear regulator or DCDC buck converter

I would like to power an ESP32 in my car, so the input voltage is between 11 and 15v, and the output voltage should be 3.3v to power the Arduino board. I thought that LDO were only for low dropout ...
1
vote
0answers
52 views

Linear power supply and mains filtering and protection

I'm designing my first linear power supply for my project which needs dual rail 12V (the regulation from 15V to 12V is on another board, 7812 and 7912). The +12V (+15V) rail will draw about 250mA, the ...
1
vote
1answer
43 views

Datasheet Notation for Filter Parameters

I've been reading through the LTC1264-High Speed Quad Universal Filter Building Block datasheet but I'm having some trouble deciphering the meaning of some of the variables used in the equations for ...
1
vote
1answer
50 views

Variable LDO implementation - capacitor size

I am designing two linear power supplies that will: Drop 9V DC to 5V DC to power a Raspberry Pi around 2.5A Drop 9V DC to 7.5V DC to power a DAC under 3A I plan to use Texas Instruments LDO UCC283-...
1
vote
1answer
71 views

How are op-amp gain vs frequency response curves generated?

I have been wondering this for a while. When we look at the electrical characteristics of a device such as an opamp there is a gain versus frequency plot. I have couple of questions regarding ...
1
vote
1answer
42 views

Automatic control - linearization with two states

I don't understand a part of the solution to c) of this problem, namely linearization at a stationary point using Taylor series and partial derivatives. I am used to linearization of \$ f(x,u) \$ (...
0
votes
0answers
21 views

System Function and its Inverse

(I am not really sure if the title is appropriate) I was solving a problem which finally I reduced to finding the output voltage from terminal AB of some linear system with no sources in it, given ...
0
votes
1answer
83 views

This circuit is two parallel resistances of 10Ω. Convince me otherwise

I'm trying to find the Thévenin equivalent resistance of a circuit - one that resembles a Wheatstone bridge, but is not at balance. The load in question is where the galvanometer would appear. Anyway,...
0
votes
0answers
16 views

linearly graded doping profile in Sentaurus

How to define a linearly graded doping profile in Sentaurus? It has options of Gaussian function and error function but how to define a linearly graded profile with a decay rate of 5nm/dec?
0
votes
1answer
132 views

Linear voltage regulator failure?

I've been building USB powered audio DAC circuit which is using multiple LDO voltage regulators. I discovered one of the regulators, namely TPS79333, which is responsible for supplying 3.3V to ...
0
votes
0answers
35 views

Convert dB to linear form - Noise density

I am trying to calculate transmission power in my Matlab code. the formula I'm using for gain is: $$g=\frac{z}{\left(\frac{d}{d0}\right)^t}$$ in which \$z\$ is the lognormal random variable with ...
0
votes
1answer
57 views

I need a circuit for a linear integrator using a capacitance multiplier

There are various circuit topologies for capacitance multipliers using op-amps. I need to implement a linear integrator where it would be advantageous to reduce the size of the integrating capacitor ...
1
vote
1answer
90 views

Transfer function of a System Diagram

I would like to have some help on this system: I have to consider that all initial conditions at t = 0 are null. I've tried some things and I have some answers but I don't know if they are true. ...
0
votes
1answer
209 views

Linear and non linear phase FIR filter

I am a confused about linear and non linear fir filter. I have this depiction of the solution space for linear-phase and nonlinear-phase FIR filters for a given set of specifications. Region 1 ...
0
votes
0answers
29 views

Uniform Stability of a linear system

For the system $$ \dot{x}(t) = A(t)x(t),\quad x(t_0) = x_0\quad (1)$$ we say it's uniformly stable if $$\exists \gamma : ||x(t)|| \leq \gamma ||x_0||\quad t \geq t_0\quad \forall t_0,x_0$$ However, ...
0
votes
1answer
48 views

Controller/Observer Canonical Forms

Given $$ G(s) = \frac{1}{(s+1)^2} $$ how do I come up with the following time-invariant realizations? 1) Controllable but not observable 2) Not controllable but observable 3) Neither controllable nor ...
0
votes
1answer
40 views

Transfer function for controllable part of a linear system

I understand that for my linear system $$ \dot{x} = Ax + Bu ;\quad y = Cx$$ the transfer function expression $$ C(sI-A)^{-1}B = C_c(sI-\hat{A_{11}})^{-1}\hat{B_{11}} $$ where the latter exposes the ...
1
vote
1answer
34 views

Stabilizability as a weaker notion

I'm having trouble understanding why stabilizability is weaker than controllability and whereas the latter implies the former, the converse isn't true. Thanks for your inputs.
0
votes
1answer
52 views

Linear actuator suggestion - fast , powerful and small [closed]

Suggestion for linear actuators? Some desired specs Very fast [coompletes forward motion in 10-20 ms Just a pulse reaction needed - Can move forward with great speed Backward thrust not needed; can ...
1
vote
3answers
321 views

Simple current limiting on linear regulator

I'm building a simple 9v linear supply using a 7809. The transformer is capable of the 300mA that might be drawn (guitar effects supply). I'm looking for a a simple way of limiting the output current. ...
0
votes
2answers
252 views

Interpolate variable 0-24v to power a 12v fan and control it's speed

I want to replace the two noisy 24v brushless fans on my printer with high performance silent 12v fans, more specifically Noctua A4x10 FLX The 3D printer hot-end fan is on continuously with 24 volts, ...
0
votes
1answer
140 views

Question for Linear opto isolator circuit

-I want to have the same potential or linearity in opto isolator's input and output Pic below there is my previous circuit ,sketch and Changed Sketch(the last pic),but it's not linear with PC817. I ...
0
votes
3answers
103 views

How to determine the value of the variable resistor to land on saturation region?

I'm trying to determine the Linear region of the transistor by setting an upper and lower limit for the resistor on the lower left hand corner. I've already fixed the lower limit and tried to find a ...
0
votes
1answer
175 views

opamp voltage offset balance resistor for varying input Z

I'm using a non-inverting amplifier to amplify AC signal, datasheet of my opamp say this balancing resistor be used to reduce the offset errors, balancing resistor equals the parallel combination ...
1
vote
1answer
76 views

What are the mechanism and effects of non-linearity in an attenuating barrier in the presence of a high-strength EM field?

It's my understanding that in electromagnetics, if an attenuating device is functioning linearly, it means that 1) input and output signal strengths are proportional; and 2) input f = output f. How ...
-2
votes
1answer
131 views

Linear and non-linear attenuator

[edit 3/2/18] There are problems with the title and wording of this question. I would edit, but to do so would alter the relationship between the question and the answer that I accepted. So, I have re-...
0
votes
1answer
229 views

How do I choose a transistor to operate in active/linear mode?

Short version: I want to operate a transistor (of any type, but presumably MOSFET/BJT) in its "partial" on state to regulate current through various LEDs, but I'm not sure what transistor type to use, ...
0
votes
2answers
145 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 ...
4
votes
2answers
168 views

Ideally, what sort of characteristics should a transistor have for a regular linear amplifier?

Most of us recognize the graph of \$I_C\$ against \$V_{CE}\$ for different base currents (\$I_B\$): - And, ideally (as we are taught and believe) we would prefer the "constant current" part of the ...
-3
votes
1answer
57 views

Good book on system identification for non-linear systems? [closed]

Can anyone suggest a good book that describes how to experimentally identify and describe non-linear behavior in real world systems? I have had good success analyzing systems using linear methods such ...
3
votes
2answers
1k views

Is this circuit linear or not?

I designed a current source circuit for driving LEDs. This circuit works fine and supplies constant 2.5A. I wonder if this circuit is linear or not. simulate this circuit – Schematic created ...
2
votes
2answers
172 views

Why do two transfer functions of a circuit have same denominator?

I am investigating a linearised common-emitter circuit of the form: simulate this circuit – Schematic created using CircuitLab I am interested in the isolated transfer functions of each input ...
4
votes
2answers
284 views

Can someone help me to find the right transformer for this power supply?

So my current project is building a replica of the ARP Pro Soloist synthesizer from the 70’s. The project is mostly going very smoothly, but I am having some issues with the power supply section of ...
7
votes
4answers
2k views

Adding a resistor to reduce crossover distortion in an LM324/LM358

I was watching a video of the legendary Bob Pease, in which he says that the regular LM324/LM358 is not a low distortion amplifier, however, if you add a 10K resistor from the output of the opamp to ...
0
votes
1answer
85 views

Secondary linear lamp circuit interrupter switch

Following on from this answer to a previous question from a while back, I want to add a new lamp (with its own button/switch). The new lamp should be controlled separately (i.e. not controlled or ...
0
votes
1answer
932 views

Why is such amplifier configuration chosen for HB100 microwave sensor?

For HB100 microwave sensor module, I don't quite understand how this amplifier works and why it's been chosen instead of something simpler, such as two inverting or non-inverting op-amps. What can see ...
2
votes
1answer
217 views

How to find linear LEDs (light power(mW) vs current)?

I'm looking to use an LED in a control application. (feedback via LED to photodiode.) I found a few questions that didn't fit. Adjustable linear led driver? Linear, not PWM. Light intensity and ...
0
votes
0answers
227 views

Equivalent Impedance for transformers

I should find the Thevenin Equivalent Circuit for linear transformer circuit. I have a resistance and an independent source in the primary and a RL resistance in secondary. Thats why I have to find ...
0
votes
1answer
100 views

Thevenin \$V_{th}\$ calculation problem

I'm back with my basic questions. I'm trying to answer some questions, using Thevenin, for this circuit: simulate this circuit – Schematic created using CircuitLab I must answer: \$R_{th}\$ \...
1
vote
2answers
434 views

kirchhoff laws with current source connected in series to resistor

I'm struggling with the following circuit trying, using kirchhoff laws, to write equations system that solve all variables. simulate this circuit – Schematic created using CircuitLab (Ground ...