OPIC Microphone (MP PCB)
Based on Roger Shores OPIC.Multi Pattern Microphone Circuit - a PCB fitting in some microphone bodies.
You also need this additional PCB, it provides the necessary polarisation voltage:
OPIC Microphone (LDC) - Share Project - PCBWay
Rogers project:
OPIC Multi Pattern (jp137.com)
Keep in mind that I changed some part descriptions, so refer to the BOM on this page. I also added the possibility to use a pad switch.
You can use headers as a pattern and pad switch, but if you want to use real switches, this may help:
Pattern and Pad Switch Holder for BM700/BM800 by MicScharf - Thingiverse
If you want the high impedance parts not on the PCB use torrets and bend pin 3 and 5 of the OPA 1642 up.
OPIC Microphone (MP PCB)
Project images are for reference only. Actual production is based on the manufacturing files on the project page.
Please review the designer's notes (e.g., PCB thickness) and select the appropriate options.
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for issues caused by unsuitable parameter selections.
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