Working principle of small and practical acupuncture pen
I analyze it (the circuit is shown in the figure). The working principle is as follows: IC1 is a music integrated circuit. After K1 is closed, the audio current output by IC1 is amplified by BG1-BG3, then boosted by transformer B1, and the secondary output high voltage of about 200V. The latter is divided into AC and DC blocks. The high-voltage alternating current of the AC block is directly output to the needle contact, and the w2 is appropriately adjusted. When the contact contacts the human skin, it can generate strong stimulation. Because the alternating current has a skin-gathering effect, the treatment can only be applied to the skin surface. The high voltage DC block is generated by alternating current through the rectification and filtering circuit composed of D1 ～ D4, C2, and output to the contact and output socket. Use acupuncture patch, adjust w2 according to the patch spacing to make LED2 light up, which can achieve deep treatment. purpose. 
The design of the acupuncture pen is quite similar to a little mouse, and it is very novel. After use, the treatment effect is good.
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