Add Ramp To Stepping Motor

Due to their low cost, stepping-motor controllers are often chosen over full-blown, software-driven controllers for a number of applications. However, stepping motors provide rather low torque at high speeds, thus they usually require a starting ramp to prevent them from stalling at startup. This circuit is a one-chip solution to that problem.

Lying at the heart of the circuit is the 555 timer U1, which is configured as an astable multivibrator. In this case, a 50-m on time was selected to be compatible with the stepping-motor driver. The off time is approximately equal to 1. 1R2C2. A 10-ms off time was selected for the final speed of the stepping motor.

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