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close this bookAmplifier Teaching Aid (GTZ, DED; 86 pages)
View the documentPreface
View the documentIntroduction
Open this folder and view contentsLesson 1 - Semiconductor Review
Open this folder and view contentsLesson 2 - Bipolar Transistor
close this folderBipolar Transistor II
close this folderLesson Plan
View the documentIntroduction
View the documentCollector curves (output)
View the documentTransistor power dissipation
View the documentTransistor test
View the documentWorksheet No. 3
View the documentExperiment No. 3
View the documentFirst Evaluation
Open this folder and view contentsLesson 4 - Transistor Fundamentals
Open this folder and view contentsLesson 5 - Transistor Biasing
Open this folder and view contentsLesson 6 - Transistor Biasing II
View the documentSecond Evaluation
Open this folder and view contentsLesson 7 - Small Signal Amplifier
Open this folder and view contentsLesson 8 - Small Signal Amplifier II
Open this folder and view contentsLesson 9 - Small Signal Amplifier III
Open this folder and view contentsLesson 10 - Large Signal Amplifier
View the documentThird Evaluation
 

Transistor test

- Out of circuit: With an ohmmeter.

* resistance between collector and emitter should be high in both direction.

===> diodes are back to back in series (see also Fig. 2-3)

* reverse and forward resistance of emitter collector diode (reverse/forward ratio) should be more than 1000: 1 (silicon)

- In circuit: With a voltmeter

* measure VE and VC, the difference VE - VE should be more than 1V but less than VCC.

If VCE is less than 1V:


----> transistor may be shorted


If VCE equals VCC:

---- > transistor may be open
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