Audio Switch on CD4066

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STD Audio Switch on CD4066

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Update time： 2024-06-24 12:56:39

Creation time： 2019-04-04 07:52:00

Description

A stereo A/B switch using one chip and a few parts. Note that all values are not critical but typical. They can vary greatly with little effect on performance. Just impedance and audio levels. With this circuit you could eliminate the 10k input resistors. They were originally put there to create an input match. If you have an extra output pin from the PIC and want the option of turning both channels off or on at the same time, you can eliminate the inverter transistor, two associated 10k resistors, and drive the control pins (5,13 and 6,12) separately. A "1" on the port out pin will turn the switches on. A "0" will turn everything off.

Design Drawing

schematic diagram

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Audio Switch on CD4066 (SHEET)
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PCB

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Audio Switch on CD4066 (PCB)
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BOM

BOM download Purchase Parts

ID	Name	Designator	Footprint	Quantity
1	1u	C1,C2,C5,C6,C8	RAD-0.1	5
2	4.7u	C3,C4	RAD-0.1	2
3	10u	C9,C10	CAP-D3.0XF1.5	2
4	inA_GND	INA_GND	HDR-1X1/2.54	1	C81276
5	inA_L	INA_L	HDR-1X1/2.54	1	C81276
6	inA_R	INA_R	HDR-1X1/2.54	1	C81276
7	inB_GND	INB_GND	HDR-1X1/2.54	1	C81276
8	inB_L	INB_L	HDR-1X1/2.54	1	C81276
9	inB_R	INB_R	HDR-1X1/2.54	1	C81276
10	out_GND	OUT_GND	HDR-1X1/2.54	1	C81276
11	out_L	OUT_L	HDR-1X1/2.54	1	C81276
12	out_R	OUT_R	HDR-1X1/2.54	1	C81276
13	ctrl1	P8	HDR-1X1/2.54	1	C81276
14	ctrl2	P9	HDR-1X1/2.54	1	C81276
15	4.7k	R1,R2	AXIAL-0.3	2
16	100k	R3,R4,R5,R6,R7,R8	AXIAL-0.3	6
17	CD4066BE	U2	DIP14	1
18	VCC	VCC	HDR-1X1/2.54	1	C81276