Electrical

H-Bridge DC Motor Direction Control

Electrical Diagrams · made in Skemio

Circuit schematic illustrating forward and reverse conduction branches of an H-bridge driving a DC motor from a 12V DC power supply.
Circuit schematic illustrating forward and reverse conduction branches of an H-bridge driving a DC motor from a 12V DC power supply.
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What it shows

  • Diagonal switches Q1 and Q4 close together for forward rotation.
  • Pair Q3 and Q2 closes for reverse rotation, inverting motor polarity.
  • Never close high and low switches on the same side to prevent shoot-through.

The takeaway

Diagonal transistor switching flips polarity across a DC motor without moving mechanical contacts.

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