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f670l_NonIdealTransformer.hpp
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f670l_NonIdealTransformer.hpp
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//==============================================================================
/**
Wavechild 670
-------------
Wave digital filter based emulation of a famous 1950's tube stereo limiter
WDF++ based source code by Maxime Coorevits (Nord, France) in 2013
Some part are inspired by the Peter Raffensperger project: Wavechild670,
a command line with python WDF generator that produce C++ code of the circuit.
Major restructuration:
----------------------
* WDF++ based project (single WDF++.hpp file)
* full C++, zero-dependencies except JUCE (core API, AudioProcessor).
* JUCE Plugin wrapper processor (VST, AU ...)
* Photo-Realistic GUI
Reference:
----------
Toward a Wave Digital Filter Model of the Fairchild 670 Limiter,
Raffensperger, P. A., (2012).
Proc. of the 15th International Conference on Digital Audio Effects (DAFx-12),
York, UK, September 17-21, 2012.
Note:
-----
Fairchild (R) a registered trademark of Avid Technology, Inc.,
which is in no way associated or affiliated with the author.
**/
//==============================================================================
#ifndef __F670L_TRANSFORMER_HPP_362E05E5__
#define __F670L_TRANSFORMER_HPP_362E05E5__
//==============================================================================
#include "WDF++.hpp"
//==============================================================================
namespace Wavechild670 {
//==============================================================================
template <typename T>
class NonIdealTransformer : public WDF::TwoPort<T>
{
public:
NonIdealTransformer (T Fs,
T Nt,
T Lp_, T Rp_,
T Lm_, T Rc_,
T Ls_, T Rs_, T Cw_,
String name = String::empty)
: OnePort (input.R, name),
//----------------------------------------------------------------
// Components
//----------------------------------------------------------------
Lp (Lp_, Fs, "Lp"),
Lm (Lm_, Fs, "Lm"),
Ls (Ls_, Fs, "Ls"),
Cw (Cw_, Fs, "Cw"),
Rp (Rp_, "Rp"),
Rc (Rc_, "Rc"),
Rs (Rs_, "Rs"),
//----------------------------------------------------------------
transfo (Nt, "][")
//----------------------------------------------------------------
{}
//----------------------------------------------------------------------
virtual String label () const { "][" };
//----------------------------------------------------------------------
virtual void connect (OnePort<T>* parent, OnePort<T>* child)
{
root.connect (parent); wiring (child);
}
//----------------------------------------------------------------------
virtual void connectParent (OnePort<T>* parent)
{
root.connect (parent);
}
//----------------------------------------------------------------------
virtual void connectChild (OnePort<T>* child)
{
wiring (child);
}
//----------------------------------------------------------------------
virtual inline void computeChildB ()
{
}
//----------------------------------------------------------------------
virtual inline void computeParentB ()
{
}
//----------------------------------------------------------------------
virtual inline T reflected ()
{
return root.reflected ();
}
//----------------------------------------------------------------------
virtual inline void incident (T wave)
{
root.incident (wave);
}
//----------------------------------------------------------------------
virtual T R () { return root.R (); }
//----------------------------------------------------------------------
inline T Vout () { return Cw.voltage(); }
//----------------------------------------------------------------------
protected:
//----------------------------------------------------------------------
WDF::IdealTransformer<T> transfo;
//----------------------------------------------------------------------
WDF::Inductor<T> Lp, Lm, Ls;
WDF::Resistor<T> Rp, Rc, Rs;
WDF::Capacitor<T> Cw;
//----------------------------------------------------------------------
WDF::Serie<T> root;
//----------------------------------------------------------------------
WDF::Serie<T> serie_A;
WDF::Serie<T> serie_B;
WDF::Serie<T> serie_C;
WDF::Parallel<T> paral_A;
WDF::Parallel<T> paral_B;
WDF::Parallel<T> paral_C;
//----------------------------------------------------------------------
inline void wiring (OnePort<T>* child)
{
serie_A.connect (&Lp, &Rp);
serie_B.connect (&Rs, &Ls);
paral_A.connect (&Lm, &Rc);
//------------------------------------------------------------------
paral_B.connect (child, &Cw);
serie_C.connect (¶l_B, &serie_B);
//------------------------------------------------------------------
transfo.connectChild (&serie_C);
//------------------------------------------------------------------
paral_C.connect (&transfo, ¶l_A);
root.connect (&serie_A, ¶l_C);
}
//----------------------------------------------------------------------
};
//==============================================================================
template <typename T>
class InputCoupledTransformer : public WDF::OnePort<T>
{
public:
InputCoupledTransformer ()
: OnePort (1.0)
{}
//----------------------------------------------------------------------
virtual String label () const { "][" };
//----------------------------------------------------------------------
virtual inline T reflected ()
{
a = serie.reflected ();
b = -a; // short circuit rules
return transformer.Vout();
}
//----------------------------------------------------------------------
virtual inline void incident (T wave)
{
Vin.Vs = wave;
serie.incident (b);
}
//----------------------------------------------------------------------
protected:
WDF::VoltageSource<T> Vin;
WDF::Resistor<T> Rload;
WDF::Resistor<T> Rterm;
//----------------------------------------------------------------------
NonIdealTransformer<T> transformer;
//----------------------------------------------------------------------
WDF::Serie<T> serie;
WDF::Parallel<T> paral;
//----------------------------------------------------------------------
inline void wiring ()
{
transformer.connectChild (&Rload);
paral.connect (&transformer, &Rterm);
serie.connect (¶l, &Vin);
}
//----------------------------------------------------------------------
};
//==============================================================================
//
// SIGNAL AMPLIFIER TRANSFORMERS
// -----------------------------
//
// INPUT (Tx10) OUTPUT (Tx20)
// --------------------------------------------------------
// Rc 10 kOhms 10 kOhms
// Lm 35.7 H 35.7 H
// Rp 10 Ohms 5 Ohms
// Lp 4 mH 100 uH
// Rs 50 Ohms 50 Ohms
// Ls 1 mH 400 uH
// Cw 210 pF 1 pF
// --------------------------------------------------------
// Ratio 1:9 9:1
// --------------------------------------------------------
//
// T101 - Fairchild signal amp input (mono)
// T102 - Fairchild signal amp input (stereo)
// --------------------------------------------------------
// T201 - Fairchild signal amp output (mono)
// T202 - Fairchild signal amp output (stereo)
//
// --------------------------------------------------------
//
//==============================================================================
/**
template <typename T>
class Tx10 : public Transformer<T> { public:
Tx10 (T Fs, String name = String::empty) :
Transformer (Fs, 9.0, 600.0, 1360.0, 10e3, 35.7,
10.0, 4e-3, 50.0, 1e-3, 1000e3, 210e-12, name)
{} };
//==============================================================================
template <typename T>
class Tx20 : public Transformer<T> { public:
Tx20 (T Fs, String name = String::empty) :
Transformer (Fs, 1.0/9.0, 600.0, 1360.0, 10e3, 35.7,
5.0, 100e-6, 50.0, 400e-6, 1000e3, 1e-12, name)
{} };
*/
//==============================================================================
//
// SIDECHAIN AMPLIFIER TRANSFORMERS
// --------------------------------
//
// INPUT (T10x) OUTPUT (T20x)
// --------------------------------------------------------
// Rc 10 kOhms 10 kOhms
// Lm 35.7 H 35.7 H
// Rp 10 Ohms 5 Ohms
// Lp 4 mH 100 uH
// Rs 50 Ohms 50 Ohms
// Ls 1 mH 400 uH
// Cw 210 pF 1 pF
// --------------------------------------------------------
// Ratio 1:9 9:1
// --------------------------------------------------------
//
// T101 - Fairchild signal amp input (mono)
// T102 - Fairchild signal amp input (stereo)
// --------------------------------------------------------
// T201 - Fairchild signal amp output (mono)
// T202 - Fairchild signal amp output (stereo)
//
// --------------------------------------------------------
//
//==============================================================================
/**
template <typename T>
class Tx30 : public Transformer<T> { public:
Tx30 (T Fs, String name = String::empty) :
Transformer (Fs, 9.0, 600.0, 1360.0, 10e3, 35.7,
10.0, 4e-3, 50.0, 1e-3, 1000e3, 210e-12, name)
{} };
*/
//==============================================================================
} // namespace Wavechild670
//==============================================================================
#endif // __F670L_TRANSFORMER_HPP_362E05E5__
//==============================================================================
// TRANSFORMERS
//==============================================================================
// Fairchild 670 Signal amp input T101/201 600 ohms/50k ohms. Ratio 1+1:9+9.
//------------------------------------------------------------------------------
// Fairchild 670 Signal amp output T102/202 600 ohms/60k ct/ Ratio 9+9:1+1
//------------------------------------------------------------------------------
// Fairchild 670 Control amp input T103/203 600 ohms/170k ohms. Ratio 17+17:1+1
//------------------------------------------------------------------------------
// Fairchild 670 Control amp output T104/204 600 ohms/10k ct/ Ratio 4:1
// Feedback winding ratio 9.5:1
//------------------------------------------------------------------------------
// Fairchild 670 Bias supply Transformer. T301 50/60 Hz
// Secondary windings: 375-0-375 V at 200 mA,
// 6.3V CT at 5A,
// 5.0V at 2A
//------------------------------------------------------------------------------
// Fairchild 670 Mains Transformer. T302 50/60 Hz
// Secondary windings: 26.8V (for Selenium bridge rectifier)
// tapped at 24V (for Silicon bridge rectifier) at 200 mA.
//------------------------------------------------------------------------------
// Fairchild 670 Heater Transformer. T303/304 50/60 Hz
// Secondary windings: 6.3 V CT at 3 A
// 6.3 at 2.6A
//------------------------------------------------------------------------------
// Fairchild 670 Bias supply Choke. L301 71 Ohms 10H at 200 mA
//------------------------------------------------------------------------------
// Fairchild 670 Bias supply Choke. L302 85 Ohms 5H at 200 mA
//==============================================================================