----- Original Message -----
From: Wagner Lipnharski <wagner@USTR.NET>

Wagner wrote

> If you are driving a transistor connected to ground, it means the motor
> has one lead to VCC, than it seems to be an under driving  situation.
> This should be the reason why your voltmeter shows the same voltage no
> matter which pwm signal you use. The transistor is not switching
> completely to ground.  Why don't you show a simple schematic about this
> driving design?
>
> Wagner

the circuit that i have use is actually the circuit that is found in
appication note for L298/L293 (bi-direction)
the only thing thing i did not follow is tha used of diode at the output and
the others all the same


thanks for your help

regards


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