555 car circuit diagram of the device

Posted on Mar 28, 2007

As shown in the circuit diagram of the device is looking for 555 cars, including a transmitter and a receiver in two parts. The transmitter 555 is a core component of the wave

555 car circuit diagram of the device
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frequency oscillator, the oscillation frequency should be selected than the AM broadcast carrier frequency 535kHz slightly lower frequency value, RP1, C1 is determined by R1, that is, f 1.44/(RP1 + 2R1) C1, L1, C2 form the output resonant circuit, frequency selection, and then by C3 emitted by the antenna. Receiving circuit by the input frequency selective network and 741 op amp, amplifier magnification depends on the ratio RP2/R2s. LED1 ~ LED5 received signal strength indicator is used, and as the signal strength, the arc tube is lit sequentially.

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