Disclosed is an electronic system activatable by electrical power. The systemis useful for influencing cellular f unctions or malfunctions in a warm-bloodedmammalian subject. The system comprises one or more controllable low energyH F (High Frequency) carrier signal generator circuits, one or more data processorsor integrated circuits for receiving control information, one or more amplitudemodulation control generators and one or more amplitude modulation frequencycontrol generators. The amplitude modulation frequency control generatorsare adapted to accurately control the frequency of the amplitude modulationsto 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 modulationfrequencies
