NE5534 microphone preamp

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 !!