Friday, October 13, 2017

Pleiades filters simulating recording and reproducing in real time


This may be the simplest simulation.


Just any inductor connected in parallel with the signal.


The signal voltage causes current to flow through the inductor.


Current (electron flow) creates a surrounding magnetic field.


So the varying signal current creates a varying magnetic field. (same as a recording head).


Varying magnetic fields can produce a corresponding voltage in nearby coils or inductors.


So voltage is created on the same inductor, like a reproducing head does.


Since the same inductor is the cause and result, it is called self inductance.


This miracle is done by the magnetic flux flowing inside the magnetic core to which the winding is wound.


If another inductor is wound around this core this is called mutual inductance and we have a transformer.


The core material plays a very important role at it defines how the system behaves at very low signals and how gradual the desired in audio engineering saturation is.


A most important thing to remember, perhaps all electromagnetism in 3 sentences is the following:


Stationary charges create an electric field.


Moving charges create a magnetic field.


Accelerating charges create an electromagnetic wave.


References:


Electromagnetism - Grant, Phillips


The Feynman lectures in physics - Volume II


Engineering Electromagnetics - Hayt


Applied Electromagnetics - Plonus


Electricity and Magnetism - Purcell - Berkely Physics Course


A treatease on Electricity and Magnetism - Maxwell - Dover


Tubes vs Transistors, is there an audible difference - Russel O. Hamm, JAES


Alekos Soupianos Lectures

















No comments:

Post a Comment