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DC motor circuits - SparkFun Electronics

The voltage supplied to a DC motor controls its speed!! ... This device is designed for use as a medium power amplifier and switch requiring collector currents up to 500 mA. 2N4401 MMBT4401 ... Pin 9 or another PWM pin drives the transistor base! 10/25/12! 10! …

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Variable speed AC drives will maintain a constant volts/hertz relationship from 0 - 60 Hertz. For a 460 motor this ratio is 7.6 volts/Hz. To calculate this ratio divide the motor voltage by 60 Hz. At low frequencies the volt-age will be low, as the frequency increases the voltage will increase. (Note: this ratio may be varied somewhat

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