Photodiode component demonstration circuit controls LED brightness learning electronics lesson 0060

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May I ask where you purchased these photodiodes? I have been having trouble finding them and I would like to obtain some just like the ones you used here. Thanks!

Enigma
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Thanks for your efforts to share with us. Is there a particular practical circuit application where you know this design to be used? Or, is the video just to instruct and inspire creative designs? The circuit might be reconfigured to use a single photodiode and a current mirror. That way, there would not be any discrepancy in current doubling, due to a difference in the light that is striking the different photodiodes.

td