Frequency-variable golden beauty bar

A frequency-variable golden beauty bar comprising a beauty bar body and a circuit board, the circuit board arranged in the beauty bar body, wherein the circuit board includes:

• a control module, configured to convert a voltage variation into a frequency variation, comprising:
• an MCU chip, a first resistor, a second resistor, a first capacitor and an adjustable potentiometer;
• wherein a VDD terminal of the MCU chip connects to a power source terminal through the first resistor, and gets grounded through the first capacitor, while a GP3/MCLR/VPP terminal of the MCU chip connects to a second pin and a third pin of the adjustable potentiometer, whose first pin and fourth pin are grounded, and the second pin connects to the VDD terminal of the MCU chip through the second resistor, a GP2/TOCK1 terminal of the MCU chip connects to the said enable module, and a GND terminal of the MCU chip is grounded;
• and
• an enable module, configured to receive a signal of the frequency variation and control a rotating speed of a motor, wherein the control module connects to the enable module.