L298 Schematic. Here the motor rotates in the direction dictated by the switches. It has two specific pins for enabling or disabling the particular device attached at its output.
Here you can see the inner parts of l298. The above circuit will rotate the both motors clock wise for 3 second and stop for 3 second. Its receives ttl logic signals and operates different loads like motors solenoid relays etc.
An h bridge schematic looks like this.
The circuit will allow you to easily and independently control two motors of up to 2a each in both directions it is ideal for robotic applications and well suited for connection to a microcontroller. The schematic diagram of this device explains about the internal structure of that device. The l298 is an integrated monolithic circuit in a 15 lead multiwatt and powerso20 packages. Its receives ttl logic signals and operates different loads like motors solenoid relays etc.