The figure illustrates a reversible de motor drive application with adjustable speed control. The D inputs for these drivers are complementary and can be tied together and driven from the same logic control for bidirectional motor drive. The enables are tied together and driven by a pulse-width-modulated generator providing on duty cycles of 10 to 90% for speed control. A separate enable control is provided through an SN7409 logic gate.
Speed-controlled-reversible-dc-motor-drive - schematic

See the truth table for this motor controller application. Definitions for the terms used in the truth table are as follows: -EN Enable -DC Direction control -SP.C Speed control -A Direction of current-right to left -B Direction of current-left to right -H Logic 1 voltage level -L Logic 0 voltage level -N Speed control setJor narrow pulse width -w Speed control set for wide pulse width -X Irrelevant

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