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diff --git a/src/electronics/simulation/diode.h b/src/electronics/simulation/diode.h
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+/***************************************************************************
+ *   Copyright (C) 2003-2004 by David Saxton                               *
+ *   david@bluehaze.org                                                    *
+ *                                                                         *
+ *   This program is free software; you can redistribute it and/or modify  *
+ *   it under the terms of the GNU General Public License as published by  *
+ *   the Free Software Foundation; either version 2 of the License, or     *
+ *   (at your option) any later version.                                   *
+ ***************************************************************************/
+
+#ifndef DIODE_H
+#define DIODE_H
+
+#include "nonlinear.h"
+
+class DiodeSettings
+{
+	public:
+		DiodeSettings();
+		void reset();
+		
+		double I_S;	///< Diode saturation current
+		double N;	///< Emission coefficient
+		double V_B;	///< Reverse breakdown
+// 		double R;	///< Series resistance
+};
+
+
+/**
+This simulates a diode. The simulated diode characteristics are:
+
+@li I_s: Diode saturation current
+@li V_T: Thermal voltage = kT/4 = 25mV at 20 C
+@li n: Emission coefficient, typically between 1 and 2
+@li V_RB: Reverse breakdown (large negative voltage)
+@li G_RB: Reverse breakdown conductance
+@li R_D: Base resistance of diode
+
+@short Simulates the electrical property of diode-ness
+@author David Saxton
+*/
+class Diode : public NonLinear
+{
+	public:
+		Diode();
+		virtual ~Diode();
+	
+		virtual void update_dc();
+		virtual void add_initial_dc();
+		virtual void add_map();
+		virtual Element::Type type() const { return Element_Diode; }
+		DiodeSettings settings() const { return m_diodeSettings; }
+		void setDiodeSettings( const DiodeSettings & settings );
+		/**
+		 * Returns the current flowing through the diode
+		 */
+		double current() const;
+	
+	protected:
+		virtual void updateCurrents();
+		void calc_eq();
+		
+		void calcIg( double V, double * I, double * g ) const;
+		
+		double g_new, g_old;
+		double I_new, I_old;
+		double V_prev;
+	
+		DiodeSettings m_diodeSettings;
+};
+
+#endif
+