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2x Pushbutton switches, all 2pin: - all step switches (all go to same bus) - run/stop 2x Pushbutton switches, all 2pin: - all step switches (all go to 10 nF | Unpolarized capacitor | | U2 | 1 | B20k | Potentiometer | | | J2 | 1 | LM358 | Low-Power, Dual Operational Amplifiers.

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