- #1
nfi
- 1
- 0
- Homework Statement
- Plot the characteristic curves of a BC108 Transistor
- Relevant Equations
- Rb=100k, Rc=1k, VCC=15V
Hello,
I've carried out an experiment to plot the characteristic curves (Ic vs Vce) for a BC108 transistor and then attempted to find where the load-line intersects those curves. Below are my results:
...as you can see, the load-line doesn't intersect the characteristic curves at all.
When carrying out the experiment, the values of Ic shown were recorded as Vce was varied from 0V to the final value of Vce shown - it wasn't possible to drive Vce any further for each curve, despite the supply being 15V.
Am I doing something wrong here, or is this to be expected? I was hoping to find the upper and lower value of Ib to design an amplifier, but this isn't going to be possible with these results. Can I just extrapolate by extending the characteristic curves? i haven't tried changing Rc for a smaller value - would this improve the results?
Any helpful suggestions would be very welcome,
Thanks :)
I've carried out an experiment to plot the characteristic curves (Ic vs Vce) for a BC108 transistor and then attempted to find where the load-line intersects those curves. Below are my results:
...as you can see, the load-line doesn't intersect the characteristic curves at all.
When carrying out the experiment, the values of Ic shown were recorded as Vce was varied from 0V to the final value of Vce shown - it wasn't possible to drive Vce any further for each curve, despite the supply being 15V.
Am I doing something wrong here, or is this to be expected? I was hoping to find the upper and lower value of Ib to design an amplifier, but this isn't going to be possible with these results. Can I just extrapolate by extending the characteristic curves? i haven't tried changing Rc for a smaller value - would this improve the results?
Any helpful suggestions would be very welcome,
Thanks :)