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[51] PWM control of L293D using 8051

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manu4fun

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Ok hi guys , need some help with PWM using 8051.I have got the proteus simulation working but i have some doubts regarding the hardware implementation.In the simulation i used a ton period of 50 ms ,60 &80ms to generate PWM signal(T=100ms) which is connected to the enable pin of L293D IC to drive a 12V DC motor & there is speed variation.But should i make the time period in seconds for hardware implementation?
 

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