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STD Portable Headset + Aux Mixer

License: CC-BY-NC 3.0

Mode: Editors' pick

Cloned from Headset mixer

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Update time: 2023-04-27 19:09:42
Creation time: 2023-03-04 09:27:00
Description

Check the ERRATA (second sheet) before implemeting!

 

Inputs and outputs:

  • TRRS Headset connector (passive headphones + mic for voice)
  • AUX: Stereo line in (mixed to mono)
    • Mixed into headphones for monitoring
    • Mixed into mixed output for recording/streaming
  • TRRS connector for stereo input + mic level mixed output (Aux + Voice)

 

Designed to be used with a portable guitar amp or other line level device to call into a conference (e.g. Zoom) via a mobile phone. Tested with a standard iPhone Lightning->TRRS adapter.

 

DISCLAIMER: No warranties or guarantees of any kind. It works for me but it may not work for you. It may destroy your devices. You have been warned. I assume no responsibility for any damanges caused by anyone using or implementing this design.

Design Drawing
schematic diagram
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PCB
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ID Name Designator Footprint Quantity
1 HDR-F-2.54_1x3 AUX_IN HDR-TH_3P-P2.54-H-M-W10.4 1
2 9V BAT HDR-TH_2P-P2.54-H-M-W10.4 1
3 330u C1,C6 CAP-D10.0-F5.0 2
4 1u C2 RAD-0.2 1
5 1u C3,C4,C5,C7 CAP-D5.0×F2.0 4
6 10u C8 CAP-D5.0×F2.0 1
7 220u C9,C10 CAP-D10.0XF5.0 2
8 100n C11 RAD-0.1 1
9 100n C12 CERAMIC-5.08 1
10 1N4002 D1 1N4002 1
11 HDR-F-2.54_1x3 H1 HDR-F-2.54_1X3 1
12 HDR-F-2.54_1x4 HS_IN,HS_OUT HDR-TH_4P-P2.54-H-M-W11.0 2
13 LED-0603_R LED1 HDR-TH_2P-P2.54-V-M-1 1
14 POT_MIC_10k POT_MIC HDR-TH_3P-P2.54-H-M-W10.4 1
15 10k R1,R2,R3,R4,R5,R7,R9,R11,R12,R17,R18,R19,R23,R24,R25 R_AXIAL-0.4 15
16 1k R6,R15,R20,R21 R_AXIAL-0.4 4
17 2k2 R8,R14,R22 R_AXIAL-0.4 3
18 100 R10,R13,R16,R26 R_AXIAL-0.4 4
19 TRIM_AUX_1k TRIM_AUX TRIM_POT 1
20 TLE2426CP U2 PDIP-8_L9.6-W6.4-P2.54-LS7.9-BL-1 1
21 UA741CN U3 DIP8 1
22 TL074 U1 PDIP-14_L19.3-W6.4-P2.54-LS7.9-BL-1 1

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1

20230328_070037337_iOS.jpg

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2

circuit.jpg

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