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>> No.1490050 [View]
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1490050

>>1490017
There's an unconventional way to use an instrumentation amp to measure the photocurrent of a diode. In case of the AD8221 (± supply) you get Vo=49.4kΩ*Iph or about 0.5V at 100lx for a BPW34. The conversion gain is fixed because there is no access to Rf.
Source: https://www.radiolocman.com/shem/schematics.html?di=184339

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