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Electronics / LED that decreases in intensity when excitation is increased on DAQ software
« on: October 06, 2017, 12:37:03 AM »
Hi Daniel,
I've been experiencing a strange problem of LED light intensity getting weaker when I increase excitation % on the DAQ software (0% being the brightest and 40% and above the dimmest). When I compared the default LED intensity on this miniscope with the default LED intensity on the other microscope which behaves normally with good light intensity, it was much weaker. I tried resoldering with a new set of LED+LED PCB, resoldering wires that connect CMOS and LED PCBs, and even using new coax cable + new CMOS PCB the problem persisted. I received these two presumably problematic CMOS PCBs from the same source (neighbor lab) and the other one that works fine from another source. So I've been thinking that these two particular CMOS PCBs could have been from a defective batch or of version that is not compatible with the DAQ hardware+software. Did you have a similar experience, and if not what do you think could be a possible explanation? Currently I'm using old version DAQ PCB.
Best,
Don
I've been experiencing a strange problem of LED light intensity getting weaker when I increase excitation % on the DAQ software (0% being the brightest and 40% and above the dimmest). When I compared the default LED intensity on this miniscope with the default LED intensity on the other microscope which behaves normally with good light intensity, it was much weaker. I tried resoldering with a new set of LED+LED PCB, resoldering wires that connect CMOS and LED PCBs, and even using new coax cable + new CMOS PCB the problem persisted. I received these two presumably problematic CMOS PCBs from the same source (neighbor lab) and the other one that works fine from another source. So I've been thinking that these two particular CMOS PCBs could have been from a defective batch or of version that is not compatible with the DAQ hardware+software. Did you have a similar experience, and if not what do you think could be a possible explanation? Currently I'm using old version DAQ PCB.
Best,
Don