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The L298 dual full-bridge motor driver board for Arduino/Raspberry-pi,uses double H driver ic L298 which an integrated monolithic circuit in a 15 - lead Multi watt and Power SO20 packages. It is a high voltage, high current dual full-bridge driver designed to accept standard TTL logic levels and dri..

ROBOMART makes a low-cost relay board shown above that contains both the relay and the required driver circuit built using a discrete transistor. The relay coils on this relay require around 6VDC. It is easier to drive relays like this that use a lower coil voltage. The relay can switch up to 220VAC..