HardLabs

Audioswitch

zehome·autoaudioswitcher

Audioswitch PCB layout, top view — open source board by zehome

About the Audioswitch PCB

Audioswitch is an open source PCB design by zehome, published on GitHub under the BSD-3-Clause license. It is a 2-layer board measuring 120 × 50 mm, with 80 components from 31 distinct parts.

Other key parts include the LM358, ADG409, TC1044S and LM317. By type, the board carries 35 resistors, 17 capacitors, 7 ICs, 5 diodes, 4 connectors and 3 test points.

It belongs with the audio designs in this gallery.

From the project

OSHW: Automatic audio input switcher based on audio activity

Introduction ------------ With vintage amplifiers, you have limited input switching capabilities. And they are all manual. This projects aims to solve this problem.

I have an old kenwood KA-4002 (http://www.hifivintage.eu/product.php?id_product=476) which I love.

So, my solution to this problem, automatic audio input switcher. Basically, the system will detect which audio input has a signal, and switch to it using a solid state MUX.

Audioswitch, from the project README
From the project README

Main components on the Audioswitch

LM358ADG409TC1044SLM317

Audioswitch bill of materials (BOM)

80 components, 31 distinct parts.

QtyPartRefs
4
LM358
U1, U2, U3, U4
1
ADG409
U5
1
TC1044S
U6
1
LM317
U7
1
POWER
P1
1
TESTPWR
P2
1
DETECT CONN
P3
1
CTRL CONN
P5
1
INPUT1
JACK1
1
INPUT2
JACK2
1
INPUT3
JACK3
1
INPUT4
JACK4
1
OUTPUT1
JACKOUT1
4
100K
RV1, RV2, RV3, RV4
1
TP -5V
TP1
1
TP_VIN
TP2
1
TP_VCC
TP3
4
DIODE
D1, D2, D3, D4
1
PWR LED
D5
4
10nF
C1, C2, C3, C4
Show 11 more
QtyPartRefs
3
10uF
C5, C6, C12
4
100uF
C7, C8, C9, C10
1
0.1uF
C11
5
10nF
C13, C14, C15, C16, C17
12
10K
R1, R2, R3, R7, R10, R11, R12, R13 +4
8
1K
R4, R9, R18, R19, R20, R27, R28, R29
8
100K
R5, R8, R21, R22, R23, R30, R31, R32
4
15K
R6, R24, R25, R26
1
720
R33
1
240
R34
1
1K
R35

Audioswitch design files

The KiCad project lives in the zehome/autoaudioswitcher repository on GitHub; these links point at the commit this page was built from.

Audioswitch: common questions

How big is the Audioswitch PCB?

The Audioswitch measures 120 × 50 mm, has 2 copper layers and is 1.6 mm thick.

How many components are on the Audioswitch?

80 components, from 31 distinct parts. The full bill of materials is listed on this page.

Where can I download the Audioswitch design files?

From the zehome/autoaudioswitcher repository on GitHub, which has the KiCad layout; the links under Design files point to each one.

Can I use the Audioswitch design in my own project?

Yes, under the terms of its BSD-3-Clause license, which zehome chose for the repository.

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