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Audio input selector circuit (4416 CMOS)

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This circuit is also Crossed to: Audio Mixers

CMOS switches are used directly to select the entries in the audio circuits, it can introduce unacceptable levels of distortion, but if the switch is included in the feedback network of an op amp, the distortion due to the switch may be virtually eliminated. The circuit uses a CMOS switch 4416, arranged as two independent SPDT switches. If switching transients are unimportant, R5 and C1 can be omitted, and R4 may be short-circuited.
Audio input selector circuit (4416 CMOS)

However, a return path must be maintained even if a channel is turned off, to keep the inverting input of op amp to ground potential, and avoid excessive crosstalk between channels.


Datasheet file1: Click here to download 4416.pdf datasheet.

Datasheet file2: Click here to download MC3403.pdf datasheet.


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