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I can see several issues with your design. The motor control is just one. Gearing. For 1-3 bounces per second, that's 60-180 RPM. Your motor probably goes something like 1750 RPM. As jsotola commented, you'll need to add a gearbox, or else replace the motor with one that has an integrated gearbox ("gear motor"). You won't be able to reliably ...

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