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Automatic voice greeting circuit diagram

2014-11-09 00:39  
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Automatic voice greeting circuit diagram
The circuit consists of two separate infrared transmitter and receiver circuits. In the circuit, 555 forms the multivibrator, and the duty cycle is 6:1. In order to avoid cross-infection, the frequency of the transmitter 1 is 48kHz, and the frequency of the transmitter 2 is 32kHz. Sound circuit consists of two voice integrated circuits KD5603 (Welcome) and KD-5604 (Thank you for coming). It is triggered once to emit sound. And the duration is 1.5 S. The audio amplifier is played by the LM386. IC7 and IC8's signal is amplified by LM386 to drive the speaker and emit sound.