The 7805 voltage regulator will take the input of 9 volts from the battery and convert it to 5 volts needed by the chips which will be used in the circuit 5 . Place the 7805 voltage regulator so that ...The 7805 voltage regulator will take the input of 9 volts from the battery and convert it to 5 volts needed by the chips which will be used in the circuit 5 . Place the 7805 voltage regulator so that it straddles rows 1, 2, and 3 on the breadboard as shown in Figure \(\PageIndex{6}\). When the switch is pointing towards the first (positive) input the output of the switch is negative, and when the switch is pointing towards the third (negative) pin the output is positive.