Light Pollution Meter

My circuit adds a transistor, to add feedback, and two resistors, to tailor the range of the control, with the result that a single-turn potentiometer gives a control range of about 2 to 30 microamps. I installed my circuit in a small plastic box, and mounted banana plugs on the bottom of the box spaced so that they would plug directly into the DMM. This combines the controller with the DMM, so there is one less thing to hold.

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