555 automobile device circuit diagram

Published:2011/7/22 1:22:00 Author:Sophia | Keyword: automobile device circuit | From:SeekIC

As shown, the car recording device includes the transmitter and receiver. Transmitter constitute oscillator of midband frequency with the core 555, oscillator frequency should be slightly lower than carrier frequency 535KHZ of the AM broadcast, the frequency value depends on R1, RP1, C1, namely f = 1.44 / (RP1 +2 R1). C1, L1, C2 constitute the output resonant circuit, which selects frequency, and then transmit through the C3 by the antenna. Receiving circuit is composed of the input frequency-selective network and 741 op amp. Amplification factor of amplifier depends on RP2/R2. LED1 ~ LED5 is used to indicate received signal strength. Along with the strengthening of the signal, luminotron will be lighted up by the order! !



Reprinted Url Of This Article:
http://www.seekic.com/circuit_diagram/555_Circuit/555_automobile_device_circuit_diagram.html

Print this Page | Comments | Reading(3)