GRAK -- PWM board

GRAK

PWM Board

Parts cost:
Average current:

$16
15 ma

The GRAK PWM board contains 2 separate motor controllers capable of driving motors from 5 to 15 volts and up to 1.5 amps peak. The amplifying H bridges are cross-over protected and have an efficiency of approximately 85%. Each driver has its own Pulse Width Modulator which sets the speed of the motor using a trimpot on the back of the board. The PWM enable ("Slow") and motor direction ("Rev") signals can be latched by bringing the "Write" input low. Each driver channel also has a separate, unlatched "Fast" line. This can be used to override the slow speed command, or to supply an external pulse width modulated control input. Power for the motors must be supplied from an external source with a common ground.

Block Diagram

block diagram

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