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\*\* Use only four (4) potentiometers, either 9 mm or 16 mm 3.5 mm jack 3 mm LED 5 mm | | | | | J7 | 1 uF | Unpolarized capacitor | Tayda | A-111 | | | U3 | 1 | TL071 | Operational amplifier, DIP-8 | | | | | | | | | | J1 | 1 | ICM7555xP.

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