555 remote control doorbell circuit

Published:2011/6/7 8:53:00 Author:TaoXi | Keyword: 555, remote control, doorbell | From:SeekIC

As the figure 15-23 shows, the circuit is composed of a launcher and a receiver.The launcher is composed of the self-excited multivibrator (composed of the VT1, VT2, L2, C3.etc) and the coupling coil L1, the oscillation frequency is between 30 to 40MHz. The receiver is composed of the antenna, the tuning coil, the times voltage detector, the monostable timing circuit and the sound circuit. The monostable trigger circuit is composed of the 555 and the RP2, C9, when it receives the high-frequency signal, the signal is selected, detected, amplified by the circuit to trigger the IC1, the 555 sets, pin-3 has the high potential as the power supply of the IC2, so IC2 sends out the music. The length of the music depends on the monostable temporarily stabel timing time, the figure parameters' timing time t=1.1RP2C9 (about 1 to 10 seconds), and it is adjusted by RP2.



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