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TinyLily Mini
TinyCircuits Arduino https://www.tiny-circuits.com/tiny-lily-mini-basic-kit.html
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Altoids Smalls tin
Clean
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Grayhill 39-1, C&K 8631, or similar
Subminiature SPST NO pushbutton switch http://www.mouser.com/ProductDetail/Grayhill/39-1
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Subminiature SPDT center off toggle switch
http://www.jpmsupply.com/SPDT-ON-OFF-ON-SubMiniature-Toggle-Switch-p/70137.htm [You can do without center off .]
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110 mAh LiPo battery
https://www.sparkfun.com/products/731
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Philmore 335 or 340
Miniature DC Coaxial jack, panel mount http://universal-radio.com/catalog/parts/dcplugs.html
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LiPo battery charger with programming resistor changed from 2K to 10K
https://www.sparkfun.com/products/10217 with programming resistor changed from 2K to 10K (see Fig. 2-4 in the datasheet for the onboard Microchip MCP73831 Charge Management Controller).
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2N3904
Bipolar transistor
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1K 1/8W or 1/16W resistor
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Miniature magnetic transducer
16mm or as required
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