Circuit as shown by the 555 oscillator and amplifier driver stage composition. 555 and R1, R2, RP1, C1 and other components of a multi-harmonic oscillator whose frequency can b
e adjusted by RP1, namely f 1.44/(R1 + R2 + RP1) C1. Parameters given frequency range is shown 2 ~ 106Hz. 555 low-frequency pulse output by anti VT1 adding to the input of IC2, the power amplifier driving pulse transformer T, followed by the level of CZ jack connected massager metal plate electrode, strain on the human body or parts of the massage care. LED instructs the oscillation frequency synchronization light. RP1 to adjust the frequency, RP2 adjust the massage intensity; SA adopts spiral with switch potentiometer.