AVR-Chat

Kathy Quinlan wrote:
> OWEN-A wrote:
> 
>> 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.
> 
> No idea, I bought a brevile one a few years back, I hope it will do the job lol.
> 
If you really want something in a hurry and you charge yourself for development 
time then a COTS thermocouple adapter is also an option. This can provide 0-10V 
or 4-20mA to feed into the Mega128 ADC. Total cost < 2 manhours, finished, 
calibrated, accurate, no grief.

I used to use a Sunbeam toaster oven for a while, still available for ~AUD70. 
Fold some alfoil around the walls & the lower 75% of the door. This makes an 
incredible difference to the "cold sink" near the walls. Cook a few A4 sheets of 
paper to see what the heat distribution is like. The unit had an external PID 
controller with ramp/soak driving an Opto-SCR module which was built into the case.

There is a small Sunbeam unit with a fan as well now but I don't know how it 
would suit the application.

The unit had 2 bars ea on the top & bottom & had no probs generating a good 
reflow profile.

-- 
Cheers

Don