How to use GPIO to control line switching

yuchongjike

How to use GPIO to control line switching [Copy link]

Requirements: Use GPIO's HI/LOW to control the switching of related lines, as shown below Figure 1: Two audio output ports, connected to the same speaker. Use GPIO to select whether the current output is Line-out1 or Line-out2 Figure 2: Two display interfaces, connected to the same display. Use GPIO to select whether the current output is Display 1 or Display 2 This is the circuit I simulated with Proteus: Using 74LS245 to simulate, the circuit is switched. But for audio, it seems not to work, the output is analog signal What type of IC can be used to replace 74LS245?

曹伟1993

Analog switches are OK. I have made this kind of circuit before. However, because analog switches are used, there cannot be any pins left floating. The floating pins need to be processed.

topwon

If it is cheap, use analog switches such as 4052. If it is powered by a single power supply, you should use DC blocking capacitors and bias resistors. Unused channels should be grounded. You can find a lot of specific application circuits on the Internet.

chunyang

An analog switch should be used. If it is a digital signal, a data selector can be used. Both are standard devices.