Why are ULN2803 normally used between the microcontrollers and the relays?

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answerhappygod
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Why are ULN2803 normally used between the microcontrollers and the relays?

Post by answerhappygod »

a) for increasing the voltage capability required by a relay
b) for switching purposes
c) for increasing the current capability required by a relay
d) all of the mentioned
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