Electronics > Projects, Designs, and Technical Stuff

JBC-mini - a low cost T245 handle controller

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poorchava:
Agreed, MCP9700 is just that, cheap and simple (and I already had it in my drawer). Any other popular temperature sensor could be used: LM35, DS18B20, thermistors, diode forward voltage  etc...

Assuming that CJ is always at some fixed temperature might introduce big errors. For example in my workshop the soldering station base unit is stadning in a shelf of sorts with lots of other gear,  so the temperature there is most definitely not the same as room temperature.

@cam:
You need to know when the mains zero crossings are, make sure that the heater drive is off, measure the thermocouple voltage and then drive the heater. Cold junction temperature can be sampled at any moment convenient.

Sent from my HTC One M8s using Tapatalk.

timofonic:
Any progress on this? :D

x_dadu:
What type of termocuple this JBC C245 has ?

tcurdt:
Are the schematics online somewhere?

I am wondering about the AC vs DC choice.
Are the losses really that big at e.g. 120VA?

Icchan:
Could you please move your images to imgur instead of photobucket? They're blurred out and one can't even visit the photobucket site with adblocker on :/
Best case would be you to upload them to the forum directly... but hmmh...

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