Electrical Engineering Stack Exchange
Electrical Engineering Stack Exchange

Questions tagged [analog-computer]

An analog computer does not use discrete representation of values, but rather continuous values for its inputs and outputs. This tag includes questions about circuits used to implement analog multiplication, analog division etc.

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How to add gain to this op-amp based precision full wave rectifier?

The design for the rectifier is rather clever, and comes from TI's TIDU030: Precision Full-Wave Rectifier, Dual-Supply. It looks as follows: simulate this circuit – Schematic created using CircuitLab R2=R3=R4, and this rectifier has gain of +/-1.…
Kuba hasn't forgotten Monica
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Compute spatial integral using analog computing

Let me start by saying that I am not an electrical engineer but a mathematician, who just started to dive into the world of analog computing using for the moment Simulink to simulate an analog computer virtually. Consider the first-order…
Matthias Möller
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How to improve this precision rectifier by further decreasing cross-over transition times?

The Circuit The rectifier comes from TI's TIDU030: Precision Full-Wave Rectifier, Dual-Supply application note. My "benchmark" used as a baseline for evaluation is as shown below, powered from +12V/-12V, with a 4u6/50V tantalum across…
Kuba hasn't forgotten Monica
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Analog Computer Wiring

I'm trying to implement the following schematic of a simple analog computer The inputs are x and y, according to the text where I found this diagram the circles represent voltage dividers or potentiometers. There are some things I dont get, for…
S.s.
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How to transform resistance between two linear ranges?

This question is motivated by an automotive problem from this question. In a quad vehicle, in a 12V system, there's a fuel sender with 0-100 ohm range, empty to full. The fuel sender was a part of a retrofit fuel cell assembly and cannot be easily…
Kuba hasn't forgotten Monica
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Is it possible to make a ring modulator where we replace the transformers with op-amps?

I've tried making a ring modulator like the one in following picture but without using transformers (as the right ones are quite a bit harder to get and more expensive compared to op amps). I assume that both signals (Ux=V1 and Uy=V2) are measured…
flawr
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How can I model a double pendulum in op-amps?

I'm interested in chaotic circuits; and while many circuits that model attractors like Chua's Circuit, Lorenz Attractor, and RC phase shift networks are available, I would really like to model the behaviour of a double pendulum using op-amps. I've…
sehrgut
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Do analog circuits exist that are essentially mathematical functions in DC?

I am curious if a class of analog circuits exist that would take say a 0-5 V input signal and output a mathematical function like a sine function mapping 0-5 V to 0-2pi, or a log, exponent, polynomial? I could see the associated coefficients also…
J Collins
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Is there a way of dividing 2 DC voltages? ie Vout = V1/V2

I need to take the ratio of two filter outputs as part of a project. I converted them to DC voltage values using a rectifier and a smoothing capacitor thinking that this would make division easier. But I'm stuck for what to do now. A guitar signal…
goofballgonzalez
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How to find a floating-gate MOSFET

I'm doing a project in which I want to use a floating-gate MOSFET to perform analogic multiplication. After calibration of the resistance generated by the FGMOS, I will simply use the voltage as input, the impedance as multiplier, and the current as…
Mayeul FORCEVILLE
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How is this circuit providing solution of the differential equation d^2 v/dt^2 = -9v?

Book pages at https://books.google.co.in/books?id=d-7owi6uNtMC What I see is that they have taken d^2 v/dt^2 as an input at point A, integrated it to get dv/dt, integrated it again to get v=2sin3t V, and then inverted the output to get -9v gain.…
Pankaj Kumar
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Analog Equivalent Circuit of an easing function

I am trying to wrap my head around wether and with which circuit it would be possible to emulate the behaviour of a digital easing function like output += delta_to_target_value * easing_factor as it is illustrated in a 2D-version here. I know basic…
ato
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Multisim, Simulation Error

As the picture describes, the Vout is the division's result, but we have an error. Because my experience with MultiSim is not at a high level, why does this happen? Is this my fault ? ]1
nikolaosmparoutis
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How to model the input and output process flow in a liver model to simulate it?

What's the confusion: Confusion is to how to model the equations. What signs to use for incoming and outgoing components in a process flow. The confusion isn't mainly for how to translate the equations to a amplifier-figure(although I learnt a lot…
pravatpandey
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Is there any electrical system simple enough to make yourself which has some kind of useful property like radio communication or basic computation?

I would like to make some kind of primitive system in the direction of a computer, from scratch. Someone showed me you can use ferromagnets to do some elementary computation; the “states” are the magnetic poles which can get flipped when you run a…
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