555 autoplay radio gymnastics record device circuit

Published:2011/6/14 3:52:00 Author:TaoXi | Keyword: 555, autoplay, radio gymnastics, record device | From:SeekIC

As the figure 14-4 shows, this device is composed of the electronic watch timer, the monostable circuit, the delay amplitude discriminator circuit.etc. And this device can be used to timing play the radio gymnastics record every day. The timing signal is from the pin-12 and pin-13 of the electronic watch, when the electronic watch jumps from the 11:P to 12:A, the IC3(1/4CD4011) outputs a negative pulse transition to trigger the monostable timing circuit which composed of the 555 and RP1, C3, the timing time td=1.1RP1C3, the figure parameters' maximum delay is about 8 minutes. The amplitude discriminator which is composed of the C5, TWH8778, LED1, LED2, J has the delay function, J1-2(left) is the contact-point of the normally closed relay, when the radio socket has the electricity, the radio starts working. Figure 14-4 The 555 autoplay radio gymnastics record device circuit



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