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Wire the circuit shown, with Rc = 470 Ω and Q = 2N3904
- Record Ib and Ic in the table below for the given values of RB
- Calculate the base current IB from (9 V – Vbe)/RB
| RB | Ib | Ic | Vbe | Vce | Beta |
| 1MΩ | |||||
| 470KΩ | |||||
| 200KΩ | |||||
| 100KΩ | |||||
| 47KΩ |
- Start with RB = 1 Mohm, then continue with the RB
(A) Squeeze the transistor between your fingers to raise the case temperature, record any change in collector current _______
(B) Put a piece of ice in a plastic bag and hold it on the transistor to reduce the case temperature, record any change in collector current __________
- Describe your perception of the relationship between Beta and case temperature.
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