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as a buffer circuit... means whenever u need a high current....

e.x-> if u wnat to run a 12V relay using a PC parallel port(DB-25) output, u kan use such a TTL IC.... if u just connect the relay it will never switch!! the current in a parallel port output will just be enough to light 2 series LEDs....

ULN**** ICs are used in circuits that use PIC ICs(micro controller)..... Also ULN**** series ICs has low power dissipation...

-R-

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15y ago

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