Controlling a Motor with the L293D Motor Controller Chip
What is an H-Bridge?
The L293D Circuit
The L293D motor driver IC has two power input pins viz. ‘Vcc1’ and ‘Vcc2’.
Vcc1 is used for driving the internal logic circuitry which should be 5V.
From Vcc2 pin the H-Bridge gets its power for driving the motors which can be 4.5V to 36V. And they both sink to a common ground named GND.
Last Minute Engineer L293D DC Motor Tutorial (Arduino version)