Friday, 27 September 2019

coupling - What is the use of transistor in the input side in TTL logic family?



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Second transistor will turn ON and OFF if input voltage is directly connected to its base terminal. Then why a coupling transistor is used at the input side of a TTL logic gate?



Answer



Because with it you don't have to worry about the amount of current being fed in, nor do you have to worry about shorting your positive supply to your negative supply (which also has to do with current).


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