Dangerous Area Warning Device (the 1st)

Published:2011/7/7 9:49:00 Author:Felicity | Keyword: Dangerous Area Warning Device, the 1st | From:SeekIC

Work of the circuit The circuit consists of regulator circuit, pyroelectric infrared detection trigger circuit, electronic switching circuits, voice circuits, audio power amplifier, low-frequency oscillator and flash drive circuit. (It is showed in the picture 8-121.) Regulator circuit consist of three-terminal voltage regulator integrated circuit IC2, resistor R3, zener diode VS and filter capacitor Cl, C2. Pyroelectric infrared detection trigger circuit consists of pyroelectric infrared detection module ICl, transistors Vl, V2, resistors Rl, R2 and potentiometer RP. Electronic switching circuit consists of electronic switch integrated circuit IC5, resistors R9, RlO and capacitor C8. Audio power amplifier consists of power amplifier integrated circuit IC4, resistors R6-R8, capacitor C4-C7 and speaker BL. Low-frequency oscillator consists of Time-base integrated circuit IC6, resistors R11, R12, and capacitor C9, C10. Flash drive circuit consists of transistor V3, resistors R13-Rl5, field-effect transistors VF1, V F2and light HLl, HL2.



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