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Placed because it is based on the footprint. Some options: Bourns PTL series, such as: Update README.md 83b013c3637bfb179ad62b90a6c8b2f5fb547c8c Update README.md * [Schematic](Docs/precadsr.pdf) * PCB layout: front, back How to use the 4 pins (http://www.qingpu-electronics.com/en/products/WQP-PJ320D-72.html 3.5mm jack mic microphone phones.

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