DIY Arduino hot air SMD rework station.
Project tutorial by Alexander and Maker B R
Improved version of the soldering iron controller for Hakko 907 iron.
To simplify building the controller, LCD screen is implemented.
Project tutorial by Alexander
I don't think the schematic has any issues, can you share your pcb design, I would like to know what caused that problem.
As long as the diac is connected to triac properly the terminals A1 and A2 should not matter.
You can use fr107 instead of uf4007 and also bridge rectifier can be replaced by 4x1n4007 diodes.
If it is 18mV and your 200k trim pot is set to maximum(i.e, 200k). The output voltage should be 5v.
Can you check the output voltage of the op-amp when the thermocouple voltage is 18mV.
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