Re: Was Chopper circuit - Now ver 3.2

Hi Mike,

I think some of these questions have been answered in some overnight
threads, but....

We sell them at GBP99.00 which is approx US$140 to 145 each net.

Agreed, the part cost for a home brew 3 x L298 system would be
roughly what you say (even in the UK). The G201 is in a different
league to this, but if Mariss came along with the power stage it
could open a whole new world for the home build guys..... no ritual
silicon cremation ;-)

Sorry, didn't see your earlier posting to Steve.... maybe the thread
title was different ?

Yes, you can run the L298 at 2.5A. ST recommend an 80% duty cyle
though. To get close to this you can use a standby current circuit,
run the drive at only 24/30V and fit each L298 with (very cheap)
486/586 uP heatsink/fans. L298 has a 3 degree C per Watt junc/case
so bolt the L298 straight to the heatsink with just "white" h/s
compound.

Regards,

Paul

--- In CAD_CAM_EDM_DRO@y..., "n4onl" <umrk@b...> wrote:
> --- In CAD_CAM_EDM_DRO@y..., "paul_alz" <paul.w@a...> wrote:
> > Mike,
> >
> > We import Gecko's to the UK and re-sell them, and although there
is
> > VAT, import duties, clearance fees and shipping costs to pay, it
> does
> > not work out at 35%.
>
> Hi Paul,
> I didn't remember the numbers he cited, but that was close enough
to
> get the point across. ;)
>
> What do they sell for over there, in USD?
>
> Over here the parts to build a 3 Axis drive using this design would
> cost abt $150 for one unit. Much less than 3 201's but then their
> only 1/4th the Watts of the 201's and don't microstep.
>
>
> > I'm not attacking his project.... in actual fact I have added
some
> > helpful design pointers, and I will continue to help anyone who
> > wishes to construct drives or motion controllers for whatever
> purpose.
> >
> > Paul
>
> I never thought you were atacking, but rather in search of
> information. I'm sorry if you misinturperated my intention, which
was
> only to inform.
>
>
> > > > I've been designing drives in this industry for close on 30
> > years,
> > > so
> > > > I'd be most interested if you can design, build and market
one
> > > > cheaper !!
>
> Wouldn't we all. But I think Marris has hit a needed niche dead
> center, thats why I bought 201's and suggested them to Steve in an
> earlier post. :)
>
> Back on Topic, I've heard a rumor that the L298 is capible of 2.5A
> with serious cooling (and possibly lower Vcc), Any thoughts?
>
> Thanks
> mike