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→Part 3 - Transistor Driver
[[Image:Tip120-TO-220-3.jpg | 200px]] [[Image:Tip120_pins.png| 200px]] [[Image:Transistor_EBC.png | 200px]]
* Connect a transistor to control the brightness of a bulb by turning the knob of a potentiometer.
[[Image:Pot_transistor_bulb_driverTransistor_pot_bulb_driver.png | 300px]]* Replace the potentiometer with the photoresistor. You should be able to control the brightness with your hand/shadow now. [[Image:Transistor_photo_bulb_driver.png | 300px]]
* Substituting a photoresistor in place of the potentiometer, make a light "phobic" and light "philic" circuit, as in the diagrams below.
[[Image:Positive_feedback.png | 400px]]
[[Image:Negative_feedback.png | 400px]]
