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用555集成电路制作的探穴仪,线路简单,工作电压低,耗电小,具有较高的灵敏度,不会产生剧烈刺痛感,使用简便。该探穴仪原理如图所示,555电路处于无稳态多谐振荡状态,皮肤阻值与灵敏度调节电位器W1串连,作为555电路时限电阻的一部份,皮肤阻值越低,电路输出的音频越高。变换C_1可改变音调。使用前,接通电源后,将手电极与探笔相触,耳机即发出尖声,表明工作正常,然后调节音量电位器以获得合适音量。使用时,由患者紧握手电极,使用者戴上耳塞,调节W1使未探测时耳塞无声。然后以探笔笔尖在穴位相应解剖位置上探测,一旦触及穴位,
With 555 integrated circuit production probe hole, the line is simple, low voltage, low power consumption, with high sensitivity, will not produce severe tingling, easy to use. The hole detector principle shown in Figure 555 circuit in a state of astable multivibrator, skin resistance and sensitivity adjustment potentiometer W1 in series, as part of the 555 circuit resistance time, the lower the skin resistance, the circuit The higher the audio output. Transforming C_1 can change the pitch. Before use, turn on the power, the hand electrode and the probe touch, the headset is a sharp sound, indicating that the normal operation, and then adjust the volume potentiometer to obtain the appropriate volume. When in use, the patient grips the hand electrode, the user puts on the earplug, and adjusts W1 to silence the earplugs when they are not detected. Then to probe tip in the corresponding anatomical location of the probe, once touched the acupuncture points,