AVR-Chat

Have you found a suitable oven for SMD work, I tried a toaster oven of a
brand commonly available in AU and found that it was a little slow coming up
to temp, and the temp distribution was poor (hot spots). There was a lot of
heat loss "no insulation" the outside covers were nearly as hot as the
inside of the oven and due to lack of time and the desperate need for a SMD
oven lost interest for the time being.
Have you been able to find an oven that looks like it would do the job?
Owen.


-----Original Message-----
From: AVR-Chat@yahoogroups.com [mailto:AVR-Chat@yahoogroups.com] On Behalf
Of Kathy Quinlan
Sent: Sunday, March 19, 2006 3:42 PM
To: AVR-Chat@yahoogroups.com
Subject: [AVR-Chat] Type K inputs on AVR

Hi all,

Well I have to make 100 units (and pot them in Epoxy Resin) of an octopus
lure 
I designed for a proto run.

I am now thinking SERIOUSLY about building my SMD oven (as it is mainly SMD 
only 4 through hole solder connections and 2 through hole non solder 
connections (fishing line to hold the lure in the pot))

I also have a lot of "other" projects including a run of 200 units for my 
speed alarm unit for the Au Targa Rallys.

So I need a circuit for Type K to AVR. I know there was a design note in the

Atmel applications Journal, unfortunately the WRONG schematic was placed in 
there :(

So if anyone knows of a good easy schematic (with cold junction
compensation) 
I would love to see it. I do not need high accuracy, as solder does not mind

if it is 310C or 315C so anything to within +/- 2.5C is fine (I think the
over 
will have problems in coming up quick enough ;) (if so more elements and
more 
insulation is in order ;)

This will be an OPEN SOURCE Design. FULL PCB artwork (in Gerber and Protel 
99SE format), Schematics, Photos, source code, etc. will be on my site.

I will also be recognising all who contribute to this design.

I know I can buy chips like the MAX6675 as used in the Elector Jan06 issue, 
but these are not at hand ATM and I am running out of time.

I will also use the over for post curing of the epoxy etc. so I would like
to 
build something that can have MULTIPLE presets.

I will design around the Mega 128 (huge overkill, BUT I have them in stock
;)

-- 
Regards,

Kat.
---------------------------------------------------------------
  K.A.Q. Electronics     Website: www.kaqelectronics.dyndns.org
  IM: Yahoo: PinkyDwaggy MSN: katinka@kaqelectronics.dyndns.org
  For Everything Electronics 		   Phone: 0419 923 731
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