This PCB has high reuse value, I have a few projects in mind already: aquarium regulation, CCD cooling, grow house control, among a few.
I decided to use only 1206 components, as they are infinitely easier to hand solder. A smd dip switch selects functions and IO addresses.
The LM1307 also has a digital output, which I connected up to a NPN transistor, so it can drive a small load (up to a few hunded mA).
The board is quite small, and even with four 3.5mm mounting holes and rounded corners, it still measures less than 3x3 cm.
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