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diff --git a/src/electronics/simulation/elementsignal.h b/src/electronics/simulation/elementsignal.h
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+++ b/src/electronics/simulation/elementsignal.h
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+/***************************************************************************
+ *   Copyright (C) 2003-2004 by David Saxton                               *
+ *   [email protected]                                                    *
+ *                                                                         *
+ *   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 ELEMENTSIGNAL_H
+#define ELEMENTSIGNAL_H
+
+/**
+@short Provides different signals
+@author David Saxton
+*/
+class ElementSignal
+{
+public:
+	enum Type
+	{
+		st_sinusoidal,
+		st_square,
+		st_sawtooth,
+		st_triangular
+	};
+	ElementSignal();
+	~ElementSignal();
+	
+	void setStep( double delta, Type type, double frequency );
+	/**
+	 * Advances the timer, returns amplitude (between -1 and 1)
+	 */
+	double advance();
+
+protected:
+	Type m_type;
+	double m_time;
+	double m_frequency;
+	double m_delta;
+	double m_omega; // Used for sinusoidal signal
+};
+
+#endif