2 layers117 × 51 mm
.kicad_pcb
zehome/autoaudioswitcher
OSHW: Automatic audio input switcher based on audio activity
63 parts10BSD-3-Clause
2 layers120 × 50 mm
Audioswitch
zehome/autoaudioswitcher10OSHW: Automatic audio input switcher based on audio activity
- Size
- 120 × 50 mm
- Copper layers
- 2
- Thickness
- 1.6 mm
- Parts
- 80
- Nets
- 53
- Pads
- 241
- Tracks, vias
- 412, 4
- Pours
- 2
- Routed
- Yes
- KiCad
- KiCad 3
- Created
- 5 Aug 2014
- Updated
- 5 Aug 2014
Overview
Audioswitch is an open-source printed circuit board by zehome, from the zehome/autoaudioswitcher repository on GitHub, published under the BSD-3-Clause licence. It is a 2-layer board of 120 × 50 mm with 80 parts on 53 nets, routed with 412 tracks and 4 vias.
It is built around the LM358, TC1044SCOA and ADG409BRZ, with the LM317 among its other parts. Its parts include 35 resistors, 17 capacitors, 7 ICs, 5 diodes and 4 connectors. It belongs with the audio and music boards of this library.
Main components
4
LM358
SOP-8-18V~18V 0℃~+70℃ 1.2MHz 10nA 2 24mA 3V~36V 500uA 50nA 5mV 80dB Built-in compensation SOP-8 Operational Amplifier ROHSMSKSEMIOperational Amplifier
TC1044SCOA
SOIC-8-12V~-1.5V 0℃~+70℃ 1.5V~12V 10kHz 160uA 20mA 60Ω 98% Inverted Not supported SOIC-8 Charge Pumps ROHSMicrochip TechnologyDC-DC Converters
ADG409BRZ
SOIC-16-15V~15V、5V~12V -40℃~+85℃ 100Ω 250ns 34pF 4:1 SOIC-16 Analog Switches, Multiplexers ROHSAnalog DevicesAnalog Switches, Multiplexers
LM317
SOT-223-40℃~+85℃@(Ta) 0.003%Vout 1 1.3V~37V 1A 40V 80dB@(120Hz) Adjustable Positive Short Circuit Protection、Thermal shutdown SOT-223 Voltage Regulators - Linear, Low Drop Out (LDO) Regulators ROHSJSMSEMIVoltage Regulators - Linear, Low Drop Out (LDO) Regulators
README
README.mdautoaudioswitcher
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.
The project is in early state. Prototype circuit works on a breadbord. First test PCB done and sent to the factory.
Theory of operation
Stereo input is muxed using 10k resistors and AC coupled into an amplifier (saturated). Then, the signal is compared to a reference voltage using a comparator which charges a CAP. A MCU will then poll the charge of the CAP and trigger the MUX (ADG409) to switch on the output if needed. (Programmed in the MCU)
Status
Early design stage.
Breadboard prototype working.
Testing PCB done and sent to the factory. Gerbers available in GERBERS_REV0/.
Tools
KiCAD 20140622 + bzr4027 (r4027)
Hackaday.io entry
http://hackaday.io/project/2282-automatic-audio-input-switcher
OSHW: Automatic audio input switcher based on audio activity
Parts
80| Qty | Value | Footprint | References |
|---|---|---|---|
| 12 | 10K | R3 | R1, R2, R3, R7, R10, R11, R12, R13, R14, R15, R16, R17 |
| 8 | 100K | R3 | R5, R8, R21, R22, R23, R30, R31, R32 |
| 8 | 1K | R3 | R4, R9, R18, R19, R20, R27, R28, R29 |
| 5 | 10nF | C1 | C13, C14, C15, C16, C17 |
| 4 | 100K | RV2X4 | RV1, RV2, RV3, RV4 |
| 4 | 100uF | C1V5 | C7, C8, C9, C10 |
| 4 | 10nF | C2 | C1, C2, C3, C4 |
| 4 | 15K | R3 | R6, R24, R25, R26 |
| 4 | DIODE | D3 | D1, D2, D3, D4 |
| 4 | LM358 | DIP-8__300 | U1, U2, U3, U4 |
| 3 | 10uF | C1.5V4 | C5, C6, C12 |
| 1 | 0.1uF | C1 | C11 |
| 1 | 1K | SM0805 | R35 |
| 1 | 240 | R3 | R34 |
| 1 | 720 | R3 | R33 |
| 1 | ADG409 | DIP-16__300 | U5 |
| 1 | CTRL CONN | PIN_ARRAY_4x1 | P5 |
| 1 | DETECT CONN | PIN_ARRAY_4x1 | P3 |
| 1 | INPUT1 | 3.5MMJACK | JACK1 |
| 1 | INPUT2 | 3.5MMJACK | JACK2 |
| 1 | INPUT3 | 3.5MMJACK | JACK3 |
| 1 | INPUT4 | 3.5MMJACK | JACK4 |
| 1 | LM317 | TO220_VERT | U7 |
| 1 | OUTPUT1 | 3.5MMJACK | JACKOUT1 |
| 1 | POWER | JACK_ALIM | P1 |
| 1 | PWR LED | LED-1206 | D5 |
| 1 | TC1044S | DIP-8__300 | U6 |
| 1 | TESTPWR | PIN_ARRAY_2X1 | P2 |
| 1 | TP -5V | PIN_ARRAY_1 | TP1 |
| 1 | TP_VCC | PIN_ARRAY_1 | TP3 |
| 1 | TP_VIN | PIN_ARRAY_1 | TP2 |
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Questions
How big is the Audioswitch PCB?
It measures 120 × 50 mm and has 2 copper layers, 1.6 mm thick.
What parts does the Audioswitch use?
80 parts, built around the LM358, TC1044SCOA, ADG409BRZ and LM317. The full list of its parts is on this page, with links to each part's symbol and footprint where PCBKit's library has them.
Where can I download the Audioswitch KiCad files?
From the zehome/autoaudioswitcher repository on GitHub, at the commit this page was made from: the board is audioswitch.kicad_pcb. PCBKit opens the board in the browser, with nothing to install.
Can I use the Audioswitch design in my own project?
Its repository publishes it under the BSD-3-Clause licence: you may reuse it on that licence's terms (keep the author's notice, and for a copyleft licence share your changes alike).