555 Audio Oscillator circuit driven by radiofrequency

Published:2011/7/5 0:14:00 Author:Zoey | Keyword: 555 Audio Oscillator circuit, radiofrequency | From:SeekIC

As shown in the picture 3-14, a 555, R1, RP1,C1 and other parts constitute a controllable audio oscillator, the frequency ofparameter in the picture ranges from 600Hz~20kHz,and it can be selected by adjusting RP1. Whether the oscillator will oscillate or not is determined by the level on reset terminal of pin 4. Without radio-frequency signal, pin 4 will be in low level and 555 will cease to oscillate; when radiofrequency signal is available, it will be detected by the radiodetector diode D1, and the signal will be sent to pin 4, when the signal level is higher than 1V, the oscillator will oscillate, and the speaker will give out an audio signal that has been adjusted. Figure 3-14 Audio oscillator circuit driven by radio-frequency Figure3-15 Oscillator circuit in synchronism with clock



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