Re: Toaster Oven dimmer ?
- From: "dlharmon" <harmon.darrell@xxxxxxxxx>
- Date: 29 Jul 2005 13:20:26 -0700
Sylvain Munaut wrote:
> Hello,
>
> To try to approximate the temperature profile of a reflow oven, I'd like
> to make a computer controlled dimmer for a toaster oven.
>
> Does any one here as a schema / base where I can start from for the
> Hipower part (digital and pc interface is ok). I found some dimmer
> schema but they where all for light and a power of 500W max. Here, the
> heating element is more like 2500W. Is it just a matter of putting a
> bigger triac, that can handle that load ?
>
>
> Thanks,
>
>
> Sylvain
I have done this with some success. I used a Sunbeam oven that cost $20
and had the quartz elements. The oven is somewhat slow heating (less
than 1 degree C per second and slows down the hotter it gets). I am
considering moving the bottom element to the top and/or purchasing a
second oven for more elments. I just used a relay to control it. That
is all it should take. I used a MAX6675 thermocouple to SPI converter
to measure temperature. The board I ran was a complete success
including the 1mm pitch BGA.
I simply used thermostatic control, and it was nearly perfect. Note
that the pink line is the goal temp, and it is covered up by the fuzzy
blue line (measured temp).
There are temp profile from the oven linked at:
http://dlharmon.com/smd.html
Darrell Harmon
.
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