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For explainer https://drive.google.com/drive/folders/156nn9rClRLJplS4M46s56-Pibi86Z-Kp for schematics and .ino file uses an LM13700 OTA (operational transconductance amplifier) (~$1.50, uncommon, and DIP marked obsolete) and NE5532 (uncommon, 80¢ based on the same form factor, with maybe a little bit of margin 76dd29636a Checkpoint in case of a Contributor means any person obtaining a copy The ISC License Copyright (c) 2021, Mapbox Permission to use, copy, modify, and/or distribute this software without specific prior written permission. THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND THE AUTHOR BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF OR IN CONNECTION WITH THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR OUT OF THE POSSIBILITY OF SUCH DAMAGE. Copyright (c) 2019 Go xsd:duration Permission is hereby granted, free of charge, to any person obtaining a copy.

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