what is the real need for a power driver circuit.

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nownewww

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power drive

hi guys,

I am currently working on a project in which modulated digital data has to be coupled on to a toroidal transformer.To make the transformer carry this digital data,i learnt that it requies a power driver circuit such as the one using lm675 operational amplifier.I am not quite clear abt it and i would like to know the real need for such a power driver circuit.

can anyone explain it to me?Also pl mail me any links which explain the same.I have tried searching,but the write ups are not that explantory:|
 

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