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added Q/A about singledisk adapter to FAQ #docs

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pyr0ball 2020-07-06 11:34:17 -07:00
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docs/faq.md
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**Q:** Does this sensor support 3.3v logic controllers? **Q:** Does this sensor support 3.3v logic controllers?
**A:** Yes, but for Rev.2.x boards, this requires populating a solder bridge (SB1) on the back of the EasyPiezi board **A:** Yes, if you bought a production (v2.3.0 or later) board, the logic level of the circuit is configurable to be either 5v or 3.3v. For pre-production (beta) boards, this is possible by following [this guide](tutorials/wiring/easy-piezi/unregulated-operation/)
**Q:** Is it required to use the SingleDisk Piezo Adapters?
**A:** No. the SingleDisk adapter board is simply a carrier for a 12mm piezo disk that has the dual benefit of maximizing signal-to-noise ratio, and providing a consistent mounting scheme. All that's required is a piezelectric element that has positive and negative rails that can be connected to the Pyr0-Piezo circuit.