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Below is a digaram that uses an dual NPN transistor and capacitors could be added between base and collector to improve output.
For higher voltages a voltage regulator could be added too. I am going to make a type of spectrometer with this device. (Or I will try).Light >>> 15 W >>> Pinhole CD case >>>> Prism glass >>>>> flask cleaned >>>>> several light input diodes (Photodiodes).
Here is the diagram.
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