Lab 11.pdf - Department of Computer and Electronics...

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Department of Computer and Electronics Engineering Technology CEET 1140 Lab 11 Title: Dependent Sources. Objective: The student will be able to construct a simple circuit to measure a transistor’s β value (the ratio of the transistor’s collector current to its base current). Equipment: DC Power Supply Multimeters (2) Proto Board Parts: 1 47k Resistor, ¼ watt 1 NPN Transistor (2N3904 or 2N2222) Preparation: Write the title and a short description of this lab in your lab book. Make sure the page is numbered and make an entry in the table of contents for this lab. The simplest model for a silicon NPN transistor is a 0.7V voltage source and a dependent current source, as shown below: The value of β depends on the transistor. We can measure β by measuring the collector current and dividing it by the base current. To measure these values, we will insert an ammeter in series with the collector and measure the voltage across the base resistor, R b , as we vary voltage source E. (See schematic below.)
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