Someboby suggested to put a small Lithium battery
(6v)
to shift down the output voltage. Do you think
this
trick can work?

Regards,

Gael


> > I have a board designed to control a big electric
> > motor.
> > It manages the motor's speed, and takes as an
> > input
> > a tension between -5V and +5V. -5 is giving full
> > speed
> > backward, 0V stops the motor and +5V gives full
> > speed
> > forward.
> >
> > I have a PIC to control this board (among other
> > things)
> > I wanted to generate a frequency using the timer,
> > and then
> > use a frequency to tension converter to control
> > the board.
> >
> > My problem is that I don't know how to go from the
> > tension
> > coming from the converter (0 -> 5V) to the levels
> > needed by the
> > board (-5 to +5v). My PIC board has a 12V power
> > supply available.
> >
> > Any idea on what to do? Is there another way I
> > should follow?
> >
> > Regards,
> >
> > Gael