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The wireless alarm circuit with language chip

2016-11-26 18:09  
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The wireless alarm circuit with language chip
In the figure is the wireless alarm circuit with language chip. The alarm consists of the FM emitter, time-based circuit 555, regulated circuit and the language storage composed of the chip RX5017. In the figure, 555, R2, W1 and C7 compose the astable multi-resonance oscillator, whose frequency is f=l.44/(R1+Rwl)C7 which can be changed by adjusting W1. IC2 is the language chip RX5017, 3-pin is the power supply terminal, 5-pin is the maintain terminal of info storage, all of which are connected with the 6V battery by D2 to avoid power-off, 2-pin is the recording trigger terminal.