License

Public Domain

Tags
Recommend Projects

Headphone Amplifier & Mic Preamp

10 months ago 310
  • Description
  • Documents
  • BOM
  • Attachments
  • Members
  • Comments

Description

Headphone Amplifier & Mic Preamp

This project is a simple headphone amplifier and microphone preamp. It supports a variety of TRS and TRRS audio connector standards. It also includes mute, variable gain and activity monitoring.

This project has been successfully implemented and tested, the prototype works with only a couple of small fixes. Most of the bugs found have since been corrected in the trunk version of the project (in case I or anyone else decides to make more of these).

The only other issue of note, is that there was still more headphone to mic couple through than desired... The mic-preamp stage may need a bit of work to improve this!

TODO: V switch - This should disconnect the power entirely, rather than just control the LDO enable (otherwise there can be significant leakage current while off, which is an issue for battery power). Mute Light - shouldn't turn on when power is off... Hysterisis issue - monitor is not sensitive enough Space out connectors and knobs - it's a little tight Fix Fuse footprint - fuse footprint was incorrect Fix C22 Footprint - this needs to be slightly bigger Check Ferrite Footprint - Bigger

Documents

Headphone Amp

Power Regulation

Microphone Preamp

Headphone Indicators

Main_PCB

BOM

ID Name Designator Footprint Quantity
1 470R R13,R18,R50,R59 0603 4
2 2K2 R1 0603 1
3 220R R2 0603 1
4 130R R8,R11,R19,R28,R54,R63 0603 6
5 OPT R7,R27,R44,R33,R45,R42,R36,R35 0603 8
6 120R R10 0603 1
7 47K R12,R17,R49,R58,R64,R55 0603 6
8 1K R9,R16,R15,R38,R30,R29,R39,R47,R52,R56,R61 0603 11
9 10K R14,R20,R51,R60 0603 4
10 750R R5 0603 1
11 3K3 R3 0603 1
12 110R R4 0603 1
13 BC846B Q2,Q4,Q1,Q3,Q8,Q10,Q6,Q9,Q7,Q5 BC846B_SOT_FOOTPRINT 10
14 1N4148W-7-F D5,D8,D15,D18 1N4148W-7-F_FOOTPRINT 4
15 BAT54S D2,D1,D14,D13,D11,D12 BAT54S_SOT_FOOTPRINT 6
16 47u C4,C5,C24,C30,C29,C23 1206 6
17 Audio Jack 3.5mm 4-pole J1,J2,J6,J5 AUDIO JACK 3.5MM 4-POLE FOOTPRINT 4
18 240R R6 1206 1
19 100n C3,C2,C1,C7,C8,C18,C19,C31,C25,C32,C26,C37,C36 0603 13
20 330n C6,C9,C35,C38 0603 4
21 SLIDE_SWITCH_DPDT_SS22SBH2 SW1,SW2 SLIDE_SWITCH_DPDT_SS22SBH2_FOOTPRINT 2
22 TOGGLE_SWITCH_DPDT_734-7040 SW3 TOGGLE_SWITCH_DPDT_734-7040_FOOTPRINT 1
23 10K LOG VR1,VR2 PTD902-2015F-A103_FOOTPRINT 2
24 HSMFC155 D6,D3,D9,D16 HSMFC155_FOOTPRINT 4
25 L-3VEGW_LED D7,D4,D10,D17 L-3VEGW_LED_FOOTPRINT 4
26 OPA2134 U1 OPA2134_SOIC8_FOOTPRINT 1
27 LTC1443CS U2,U6 LTC1443CS_FOOTPRINT 2
28 1M R26 0603 1
29 487K R25 0603 1
30 120K R23 0603 1
31 365K R21 0603 1
32 62K R22 0603 1
33 27K R24 0603 1
34 47u C15,C21,C11 CASE-A_3216 3
35 TPS65135 U4 TPS65135_FOOTPRINT 1
36 FUSE_1206L025YR F1 FUSE_1206L025YR_FOOTPRINT 1
37 100n C22 1206 1
38 330u C13,C14 MCVVT016M331FB3L_FOOTPRINT 2
39 2u2 L1 INDUCTOR_1239AS-H-2R2M_FOOTPRINT 1
40 DC_JACK_BARREL_FC681465P J4 DC_JACK_BARREL_FC681465P_FOOTPRINT 1
41 10u C20,C12,C10,C16,C17,C33,C28 0603 7
42 4u L3,L2,L5,L4 FERRITE_0603_FOOTPRINT 4
43 USB_TYPE_B_67068-8000 J3 USB_TYPE_B_67068-8000_FOOTPRINT 1
44 TPS73701DCQ U3 TPS73701DCQ_FOOTPRINT 1
45 TOGGLE_SWITCH_DPDT_734-7028 SW4 TOGGLE_SWITCH_DPDT_734-7040_FOOTPRINT 1
46 49R9 R43,R34 0603 2
47 4K02 R46,R37 0603 2
48 100u C27,C34 CASE-A_3216 2
49 10R R40,R41,R32,R31 1206 4
50 TPA6120A2DWPR U5 TPA6120A2DWP_FOOTPRINT 1
51 33R R48,R53 0603 2
52 2K R57,R62 0603 2

Attachments

None
Success
The owner does not allow comments in this project now

Comments (0)

goToTop
你现在访问的是EasyEDA海外版,使用建立访问速度更快的国内版 https://lceda.cn(需要重新注册)
如果需要转移工程请在个人中心 - 工程 - 工程高级设置 - 下载工程,下载后在https://lceda.cn/editor 打开保存即可。
有问题联系QQ 3001956291 不再提醒
svg-battery svg-battery-wifi svg-books svg-more svg-paste svg-pencil svg-plant svg-ruler svg-share svg-user svg-logo-cn svg-double-arrow
We use cookies to offer you a better experience. Detailed information on the use of cookies on this website is provided in our Privacy Policy. By using this site, you consent to the use of our cookies.