On 03/26/2017 04:23 AM, Dave Caroline wrote: > I have tried a SFH213 Photodiode with a comparator but it is a bit > fiddly and not that sensitive, will try a QSE159 when it arrives. > > I don't know exactly what they are doing, the data sheet is pretty sparse on details, but it seems they must have some feedback in the amplifier to keep it just below the trigger threshold without IR pulses.
It seemed to work well over quite a good range, although I suspect with the 12 LEDs that the Blum probe puts out a lot of IR. I did work with a photodiode and oscilloscope, and could only see signals on the scope from a few inches away. So, the QSE159 ought to help out quite a bit. Jon ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Emc-users mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-users
