555 meter circuit diagram of a simple cavers

  
As shown, the apparatus includes cavers point detection circuit and triggering display circuit. The cavers instrument is a test probe grip in the hands of another probe touches
555 meter circuit diagram of a simple cavers - schematic

the skin, when approaching or touching the acupuncture points, due to the low resistance between the two electrodes, so that VT1, VT2 composite tube saturated conduction, 555 feet 2 was low, the IC is set, VT3 conduction, visual and audible display signal that points to detect quasi; non-acupuncture points, due to the large skin resistance, VT1, VT2 off, 555 in the reset state, silent light signal.




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