Hello,
I am experimenting with the voltage divider bias configuration and I am having some difficulty. Can someone please take a look at my circuit and let me know where I am going wrong.
With a voltage divider connected to the base of a transistor I am trying to obtain 1.2 VDC at the base.
Please view circuit attachment! All power sources are 3.3VDC!
I am trying to calculate R1....
The measured current at Vc is about 12ma. VRE is very close to 0.24VDC. I don't get this here... there really isn't any single Rb resistor to calculate since we have a voltage divider??
If I assume Ib is very small and negligible, can I figure It for R1 and R2 like so:
Ir2= 2.1/10K = 210ua
and therefore:
R1 = 1.2/~210ua = 10K
But this gives 0.67VDC at the base ???
confused!
any help is greatly appreciated!
r
I am experimenting with the voltage divider bias configuration and I am having some difficulty. Can someone please take a look at my circuit and let me know where I am going wrong.
With a voltage divider connected to the base of a transistor I am trying to obtain 1.2 VDC at the base.
Please view circuit attachment! All power sources are 3.3VDC!
I am trying to calculate R1....
The measured current at Vc is about 12ma. VRE is very close to 0.24VDC. I don't get this here... there really isn't any single Rb resistor to calculate since we have a voltage divider??
If I assume Ib is very small and negligible, can I figure It for R1 and R2 like so:
Ir2= 2.1/10K = 210ua
and therefore:
R1 = 1.2/~210ua = 10K
But this gives 0.67VDC at the base ???
confused!
any help is greatly appreciated!
r
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