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Classes/2010/VIS147A/Lab4

7 bytes added, 17:19, 1 February 2010

→‎Part 3 - Transistor Driver

=== Part 3 - Transistor Driver ===

* Get out your transistor. It should say "TIP 120" on the front of it.

[[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_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]]

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