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i want to control 4 motors with a single L293d.but the chip is becoming extremely hot.is it burning bcoz of the 2 extra sorte motor or i might have any short circuit in my bread-board?(i had triple checked it).
I did not read your circuit,
I did not read your circuit, but a quick one from the hip: L293D can only handle up to 1 amp. That is in many cases (depending on load and power etc) what 2 motors pull. 4 will likely be double of what it can take.
PS: Please read the rules, bcoz they are there for the site to be more readable and searchable 
Thanks.
It may help if you piggy
It may help if you piggy back 2, mount one L293D on top of another, i havn’t tried it but have seen it done somewhere… Correct me if i’m wrong!
Look at the PDF for the 293
For single motors (4) you must connect them as shown in the PDF
3 & 14 one output to one of the motor contacts and Ground to the other contact both motors and both sides
6 & 11 one output to one of the motor contacts and V+ to the other contact both motors and both sides
only one motor each side connects across 3 & 14 or 6 & 11 for foward and backward control
The enble only controls Both motors or one motor each side On or HiZ on all outputs
With 4 motors you can only turn them ON or OFF with the control inputs
Should double your current rating from 600mA to 1200mA.
Sorry, I misread your
Sorry, I misread your schematic. As hydro and basile said before. connecting 2 motors in parallel may draw too much current.
