DIY PAR meter, Yeah you heard me
How much tweaking of the calibration pot are you guys having to do to get the thing calibrated against the real PAR meter? Is the circuit still as the first post, but with a pot inline with the fixed resistor? If so, what's the typical pot setting when in cal?
I just measured the resistance of a calibrated meter. I got 24.7 k ohm.
There's an inline 15k and the pot is 10 or 15k.
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