Hi-
As I recall the temperature controller you used was about $250US (yes?)
Surely, Piclist can do better than that!
David

Alexandre Guimarces wrote:

> Hi, Wagner
>
> > Peter, it is interesting.  I always tought to test the single temperature
> > slope as your solution does.
> >
> > The recommended paste soldering says a dual temperature slope, increase
> > temperature to a certain point, hold there during some time, then increase
> > temperature to a second setpoint, hold for a short time and turn off
> > everything, just keep the fan active to cool it down.  The first
> > temperature slope is to heat everything, board, components, solder paste,
> > and create a pre-solder environment, the second slope quickly melts the
> > paste instantly, so, melting temperature is applied very briefly reducing
> > the probable thermal damage to components.
>
>     I use a small toaster oven for quite a while to produce boards and the
> right temperature profile is essential if you want repeatability and
> maintain good quality of the boards. I have made thousands of SMD boards
> with this method and it works very well if you use a controller that can do
> the right temperature "ramps". You also have to take care at the spacing
> between the components if not using airflow.
>
>     Without the right temperature profile maintened all the time the results
> will not be repeatable and soldering will not be done right for different
> board. You can get lucky and find an oven that has the right profile by it's
> own size and thermical inertia but it is not probable.
>
>     I though about making a temperature controller but buying a comercial
> one was the cheapest and most reliable way to do it.
>
> Best regards,
> Alexandre Guimaraes
>
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David Harris
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