That’s a standard oscillator circuit with two opamps, one configured as an integrator, the other as a schmitt trigger, and it does what it says on the label and not much more 
It’s the same circuit as this one:
The linked one is modified for more common resistor values (E3 series instead of E24), single supply, and also has buffers on the output, so is a bit nicer (see the linked build document for schematics and a circuit description). There’s also a link to an exponential CV converter in that thread.
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Yeah but don’t worry I’ll try my way to tune it, at least I hope it’s linear 
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Oh yeah exactly Nice I will improve my schems with the buffer! And also can I add a pot (as shown on the screenshot) to modify the PWM ?
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I just wish I could look at those schematics and know how to put them on a board ahah
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I was like you a little while ago but actually it’s pretty easy with a little bit of logic you can do it! ^^
Though I think it’s simpler to design your own PCB on EasyEDA for example than on streapboard
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I absolutely agree. You just learned by yourself or did you search somewhere?
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Youtube was my teacher haha and yeah I learn my myself! However I never made any real circuit now I just bought some AS3360 that are laying arround my desk haha I need breadboards and other componants. But yeah learning yourself is kinda easy if you are curious and a little bit motivated!
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