I'm expecting to use this circuit for my robot. But I'm supplying two PWM signals to Enable pin 1 and 2. I wanna know if adding these capacitors will affect the pwm signal which is essential for controlling motor speed.
I'm expecting to use this circuit for my robot. But I'm supplying two PWM signals to Enable pin 1 and 2. I wanna know if adding these capacitors will affect the pwm signal which is essential for controlling motor speed.
Sameera
The 0.1 caps are to stop the electrical Hash that brushed motors generate.
Because of the low resistance and the motors inductance, they won't affect the performance.
Don't try to drive the PWM at too high a frequency as you'll turn the motor into an audio noise generator.
Generally you solder the 0.1 from the motor connection to the metal body, or you can simply add a single one between the two motor connections (at the motor).
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I would increase the capacitor value on Pin 8 (from the battery) to 1000uF and add a 0.1uf across it as well.
Colecago
The L293D already has flyback diodes, but some of the others variants don't
cheers
Mark
From the TI datasheet the L293D has diodes and the L293 does not - so use the L293D 
MK
