1- control the direction of dc motor
2- control the speed
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Step 1: Idea of Work
we control in the direction of dc motor by use H bridge using 4 transistors .
and the we use two potentialmeter R5 and R6 to control in the speed .
When change the value of R5 and R6 we allow the the current to follow in direction and not follow in the anther direction according this Cases:
Step 2: Components
4 resistors 2k
4 transistors 2n2222
Step 3: Case 1
then NO current pass in the circuit
Step 4: Case 2
the current pass throw direction R5
Step 5: Case 3
the current pass throw direction R6
Step 6: Case 4
there in NO current pass throw the circuit