# Control a DC Motor

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### The purpose:

1- control the direction of dc motor

2- control the speed

### Teacher Notes

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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

### Components :

DC-motor

4 resistors 2k

4 transistors 2n2222

2 potentiometer

Battery 9V

## Step 3: Case 1

R5=0 R6=0

then NO current pass in the circuit

## Step 4: Case 2

R5=0

R6 increase

the current pass throw direction R5

## Step 5: Case 3

R6=0

R5 increase

the current pass throw direction R6

## Step 6: Case 4

R5 increase

R6 increase

there in NO current pass throw the circuit

## Recommendations

• ### Large Motors Class

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