The remote control signal input switching circuit

Published:2011/7/31 22:54:00 Author:Christina | Keyword: remote control, signal, input switching | From:SeekIC

The digital audio decoder needs a five-choose-one switch to switch three groups of coaxial BS, CD, DAT and two groups of optical signal input. In order to make the digital audio decoder panel concise, we design this kind of switching circuit. This circuit is as shown in the figure. In this figure, the receiving head receives the remote control pulse signal, and it forms the steep falling pulse edge through the capacitor C to trigger the monostable flip which is composed of the NE555, then the counter CD4017 starts counting, the Q port of it increases one bit, the corresponding relay operats to switch the corresponding input signal. The CD4017 only uses five Q ports, so the pins of it need to connect with each other.



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