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STD NE5534 microphone preamp
Profile：Electret microphone preamp
License: GPL 3.0
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 !!
Design Drawing
schematic diagram
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PCB
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| 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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