Hi Andrew

Got it working, yippee.

Output of 5v reg quite low 4.2v
I turned up VR1 full up. Output of variable voltage reg is now 12.7v
Some voltage drop across R21 & R29
Output of 5v reg now 4.95v

Windows XP recognised it straight away.

Kind regards Andy.

--- In sprog-dcc@..., "andrew_croslanduk"
<andrewcrosland@...> wrote:
>
> > This is first attempt with a surface mount PCB, I may have been
> > approx half a second soldering each pin of the FT232, was that to
> > long, could I have damaged the chip ???
>
> That shouldn't be a problem.
>
> Andrew
>
> >
> > Thanks
> > Regards Andy.
> >
> >
> >
> > --- In sprog-dcc@..., "andrew_croslanduk"
> > <andrewcrosland@> wrote:
> > >
> > > Andy,
> > >
> > > --- In sprog-dcc@..., "Andy" <andy2000@> wrote:
> > > >
> > > > Hi Group
> > > >
> > > > I have just part built my SPROG kit. upto the USB testing
> section.
> > > > unfortunately I struggling. two separate issues I think ??
> > >
> > > They are probably related. In case anyone isn't aware, the kit
> > > version is only available, to members, from MERG and is a
> slightly
> > > older (but fully compatible) version.
> > >
> > > >
> > > > 1)
> > > > My computer does not always recognise that the SPROG is
> attached,
> > > but
> > > > seems to be more reliable when i increase Vin to 17 to 18.5v.
> but
> > > > still temperamental !!!
> > >
> > > Vin should not make any difference, check thoroughly around the
> > > voltage regulators (the LM317 and the 78L05).
> > >
> > > >
> > > > 2)
> > > > Once recognised (not sure if this is normal) windows xp
> responds
> > > with
> > > > yellow box in bottom right corner :-
> > > >
> > > > "USB Device Not Recognized"
> > > > "One of the USB devices attached to this computer has
> > > malfunctioned"
> > > > ".........."
> > >
> > > Windows knows that you have connected something to the USB but
> > cannot
> > > complete the enumeration to identify exactly what, and load the
> > > appropriate drivers. The former is a result of detecting the
> change
> > > in bus loading, the latter by communicating with the device.
> Double
> > > (and triple :-)) check component values and soldering around
the
> > > FT232 and the passive components between it and the USB
> connector.
> > If
> > > the 5V is out of spec, that would certainly be an issue. Also
try
> > the
> > > troubleshooting app note AN232-02 from FTDI, although that
> assumes
> > > access to an oscilloscope.
> > >
> > > Hope this helps,
> > >
> > > Andrew
> > >
> >
>