Acousto-optic replacement, wireless signal transmission and reception circuit design
The design of the sound and light alarm system uses 74L905, light-emitting diodes and speakers. At the same time, the anti-theft alarm device uses an integrated alarm circuit KD9563, which can emit three sounds and two flashes of sound and light alarm.
Figure 5 Wireless signal transmission circuit The design of the wireless signal transmission circuit takes MICRF102 as the core, as shown in Figure 5. MICRF102 adopts SOP (M) -8 package. The chip includes a synthesizer composed of reference oscillator, phase detector, frequency divider, band-pass filter, and voltage-controlled oscillator; transmit bias control; RF power amplifier; wireless Circuits such as tuning control and varactor diodes are a true "data input to a wireless output" monolithic wireless transmitting device. It sends a wireless signal to the driver.
Figure 6 Wireless signal receiving circuit
The wireless receiving circuit takes MICRF007 as the core, as shown in Figure 6. MICRHl07 adopts SOP9 (M) -8 package, the chip circuit can be divided into 3 parts: UH F down converter, OOK demodulator and reference control. UHF down-converter includes RF amplifier, mixer, intermediate frequency amplifier, band-pass filter, peak detector, synthesizer, AGC control circuit; OOK demodulator includes low-pass filter, comparator; reference control circuit includes reference oscillation Device and logic control circuit. Through it, the driver can receive the remote alarm signal.
Design of Automobile Multi-function Alarm System Based on Single Chip Computer
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