hi iam new-bee to this forum

i want to design pwm with vb control ( using usb or serial port) .
i want to design ac/dc power supply i need variable set voltage at output

if any one can provide circuit and programme details that will be a great help for my project

many thanks in advance

raj

 

Do you want to send the PWM signal out the serial port, or send the requested frequency to a uC and have it produce the PWM?

 

Dear sir

serial port out to pwm
and pwm out to vary the dc /ac voltage.

in otherwords when i put the voltage value ( numeric) in vb6.that analog voltage should be available at the o/p (pwm).
eg:- if i set the voltage value 10 vdc in VB then i sould get 10 vdc o/p across o/p.

thanks
raj

 

I might suggest that the programming part is almost the least of it. You need some device at the other end of the serial cable (USB is much more likely to be found in the future than RS-232 serial) to take the PWM value and produce the desired output. A significant portion of that is hardware, unless this is a school problem that is proof-of-principle only.