Week 3, Transistor Switching

Week 3, Transistor Switching

Summary:
1. Setup a simple circuit with a transistor, switching base current on and off and check the result on the emitter side. Then, use finger tip as the base resistor and try again.
2. Collect current reading from base current and emitter current. The result is expected to be a linear relationship.

Schematic:

Final setup. R1 is the resistor box.

Switching the base current on and off by touching wires. Then replace R1 with finger tip.

Schematic for finding the relationship between base current and emitter current.

Setup:

Data.

Graph. The last point is not used because it is far away from the line.

Notes:
1. The base is the "switch" for the emitter. If there is no current go in the base, the "switch" is off.
2. If the base current if within a certain range, the emitter current is in proportional with the base current. The graph above shows this property; however, the received beta value is far away from what it is supposed to be.