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// Four hole threshold (HP) four_hole_threshold = 10; // If you use 9 mm vertical board mount 3PDT miniature toggle switch ON-ON | | | | | | D1, D2, D3, D4, D5, D8, D9, D10 | 8 | 1N4148 | Standard switching diode, DO-35 | | | | | | | | J2 | 1 | TL071 | Operational amplifier, DIP-8 | | | Tayda | A-1531 or A-557 | | | R24, R26, R28 | 3 | A1M | \*\*Potentiometer, 16 mm 3.5 mm jack 3 mm LED 5 mm LED 5 mm LED 5 mm x 0.3 mm x.

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