Inductive Electricity Test Pencil (CD 4069) Circuit Diagram

Published:2011/6/23 8:41:00 Author:Vicky | Keyword: Inductive Electricity Test Pencil | From:SeekIC

IC1 is a hex inverter integrated circuit CD4069 and its inverter IC1-1 together with surrounding components constitutes a high input impendent and high gain voltage amplifier. The probe receives the weak electric field signal, sends it out after amplified by amplifier and Control the post-stage circuit via inverter IC1-2. Inverters IC1-5, IC-6, resistance R5 and capacitance C2 constitute the multivibrator, whose work is controlled by the working state of inverter ICl-3. When the probe detects signal, IC1-3 sends out high level, the diode VDI ends, and oscillator works and make the piezoelectric ceramics HTD give out sounds. Meanwhile inverter IC1-4 sends out high level, triode VTI is conducted, red luminous diode LED2 lightens which represents the guide line under test is electrified.



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