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[[Image:Photoresistor_v_out.png| 200px]]
* Connect a transistor to control the brightness of a bulb by turning the knob of a potentiometer.
[[Image:Pot_transistor_bulb_driver.png]]* Substitute Subsistuting a photoresistor in place of the potentiometer. * Light , make a light "phobic" and light "philic" circuits with a transistorcircuit, as in the diagrams below. [[Image:Positive_feedback.png | 400px]][[Image:Negative_feedback.png | 400px]]