Disclosed is an electronic system activatable by electrical power. The system is useful for influencing cellular functions or malfunctions in a warm-blooded mammalian subject. The system comprises one or more controllable low energy HF (High Frequency) carrier signal generator circuits, one or more data processors or integrated circuits for receiving control information, one or more amplitude modulation control generators and one or more amplitude modulation frequency control generators. The amplitude modulation frequency control generators are adapted to accurately control the frequency of the amplitude modulations to within an accuracy of at least 1000 ppm, most preferably to within about 1 ppm, relative to one or more determined or predetermined reference amplitude modulation frequencies
