Stepper motor 101 was Re: Lini-stepper

--- In CAD_CAM_EDM_DRO@yahoogroups.com, "Mariss Freimanis"
<mariss92705@...> wrote:

>
> I'm assuming the output transistors operate as current sinks. This
> means they are operating in the linear region (simultaneous voltage
> across and current thru the transistor).
>
> For linear operation it makes no difference if bipolar NPN or n-
> channel MOSFET transistors are used. The power dissipation in the
> device will be exactly the same. 1A of current with 30V across the
> device is 30 Watts either way.
>
> Mariss
>

That would add to the statement that the design is not polished.

Adding a PWM to the driving circuit would get those devices out of the
linear range.

further, using them for telescopes, powered from a car battery would
not be a great idea if the units are drawing (wasteing) that much power.

Dave