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Button tactile switch http://www.ckswitches.com/media/1479/kmr2.pdf CK components KSC7 tactile switch D Switch, dual pole double throw | | | | | R24, R26, R28 | 3 pin Molex header 2.54 mm spacing"/> Small Signal NPN Transistor, TO-92 KK254 Molex header Operational amplifier, DIP-8 | | | | | Tayda | A-804 | | | | Q1, Q2, Q3.

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