This circuit is a bidirectional H bridge that makes control of DC motors. The circuit is based on IC L298 IC from ST Microelectronics. The L298 is a dual bridge driver that has a wide range of operating voltage and can load up to 3A. The IC also features low saturation voltage and over temperature protection.
H Bridge Motor Controller Circuit Diagram
Do not connect a motor that consumes more than 2.5A of current. The main power source may be any voltage between 3 and 40V DC. Put LM298 with a heat sink properly.
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