NE5534 microphone preamp

11 months ago

Profile:Electret microphone preamp

Open source license: GPL 3.0

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Description

For more information about the project visit this Instructables page:

NE5534 Amplifier and vibration reducer

 

  • Battery input is 4.2V MAX (single cell LiPo / LiIon)
  • Power input is 6-10V from a DC-DC boost converter
  • Use shielded cables for Mic in and Line out, preferably a ground plane on both sides of the PCB
  • You may want to use a smaller cap than 1000uF for C4, put it on (thick) wires outside of the PCB or lay it horizontally
  • You may want to use an LDO between the boost converter and power input to get rid ofnoise and ripple, ideally one with high PSR (like LM317)
  • 220k potentiometer is optional (if unused, replace with a wire / 0ohm resistor)

 

Dont forget the ground plane !! Dont forget to connect all islands of the ground pane !!

Documents

PCB_2021-02-07_14-10-38

Open in editor

BOM

ID Name Designator Footprint Quantity
1 1uF C3 CAP-TH_BD5.0-P2.00-D0.8-FD 1
2 HDR-F-2.54_1x2 POWER_IN,MIC_IN,LINE_OUT HDR-F-2.54_1X2 3
3 220k POT R_AXIAL-0.3 1
4 NE5534P U1 DIP-8_L10.1-W6.3-P2.54-LS7.6-BL 1
5 BC547BTA Q1 TO-92-3_L4.8-W3.7-P2.54-L 1
6 LED-TH-3mm_G LED2 LED-TH_BD3.0_GREEN 1
7 100nF C5 RAD-0.1 1
8 10uF C6 RAD-0.1 1
9 HDR-M-2.54_1x1 BAT HDR-M-2.54_1X1 1
10 10uF C1,C2,C7 CAP-TH_BD5.0-P2.00-D0.8-FD 3
11 1000uF C4 CAP-TH_BD5.0-P2.00-D0.8-FD 1
12 LED-TH-3mm_R LED1 LED-TH_BD3.0_RED 1
13 1N4007 D1 DO-41_BD2.4-L4.7-P8.70-D0.9-RD 1
14 1k R1,R3,R7,R8 R_AXIAL-0.4 4
15 220 R2 R_AXIAL-0.4 1
16 10k R4 R_AXIAL-0.4 1
17 68k R5,R6 R_AXIAL-0.4 2

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