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LM7806 for 6V DC motor?

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Taht should be your next step, first to see original concept. Test motor on 6V with 7806, watch how its running, measure current.

Then we go next.
 

If i use a transistor, then the max voltage i can get to the motor is 5.3v only. Is it that 6v minus transistor voltage drop?
 

The LM7806 is hot when the trimmer is turn to 0 ohm. That means it now drive direct from 6V.
I'm wondering why the LM7806 will become hot? Is it the current is too high?
 

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