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link to the opamp sparkfun uses

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commit 2dfea95a076e26ac3ac3e998c78bf1d2fca81875 1 parent 734ff10
Eero af Heurlin authored

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  1. 2  hardware/board_rev2/README.md
2  hardware/board_rev2/README.md
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     * See http://ww1.microchip.com/downloads/en/AppNotes/01149c.pdf
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   * Consider adding a microphone (for sound-sensitive stuff)
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     * http://www.digikey.fi/product-detail/en/CMA-4544PF-W/102-1721-ND/1869981
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-    * Remember an op-amp to get usable voltage levels from the mic
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+    * Remember an [op-amp](http://www.digikey.fi/product-detail/en/OPA344NA%2F250/OPA344NACT-ND/362263) to get usable voltage levels from the mic
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       * Sparkfun has a schematic but it needs changes, check [this comment](https://www.sparkfun.com/products/9964#comment-4f47af0dce395f4713000000) for reminder of freq calculations and adjust R5 to 500k for example

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