The sensitivity of the inductive test pencil based on CD4069DIY is higher than that of the ordinary test pencil , and it can be suspended to measure whether the wire is charged. This is not possible with ordinary test pencils .
ICl is a six-inverter integrated circuit CD4069, and its inverter IC1-1 and surrounding components form a high input impedance, high gain voltage amplifier. After receiving the weak electric field signal, the probe amplifies the output through the amplifier and shapes it through the inverter ICl-2 to control the latter circuit. The inverters ICl-5, IC1-6 and the resistors R5, R5 and the capacitor C2 form a multivibrator whose operation is controlled by the operating state of the inverter IC1-3. When the probe detects the signal, ICl-3 outputs a high level, the diode VDl is turned off, the oscillator works, and the piezoelectric ceramic sheet HTD is sounded. At the same time, the inverter ICl-4 outputs a high level, the triode VTl is turned on, and the red LED L2 is lit, indicating that the conductor to be tested is charged. The sensitivity of the sound and light display can be adjusted by adjusting the potentiometer RPl, and the capacitor C2 and the resistor R5 can be adjusted to obtain a satisfactory tone. This circuit consumes very little power and can be powered by two button batteries.
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