Week #6: Transistor Biasing

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rjagodowski
Posts: 2370
Joined: Fri Sep 04, 2015 6:59 pm

Week #6: Transistor Biasing

Post by rjagodowski »

This week's lab will be Experiment #6 on Transistor Bias Circuits. A copy will be provided for you in lab. A pdf of this lab can be found is here:
Transistor Biasing Lab v22.1.pdf
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You may find this link to Transistor Biasing from Electronics-Tutorials.ws handy.

When you complete this exercise, create a progress report post as a Reply to this Topic.

You will perform the calculations, build and test the four circuits in Part 1 of the lab sheets. We will not discuss the circuits in Part 2 until a bit later in the course.
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Part 1: Build & verify all 4 circuits. You may substitute a 2N2222 for the 2N3904. Suggestion: Use your multi-meter to check each transistor BEFORE putting it in the circuit. Here is a pdf of the procedure:
Transistor DMM Check.pdf
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You will make the measurements for each of 3 transistors for each circuit. This will help demonstrate the stability of the Q-point with respect to transistor variations.

Here are the formulas required for each circuit:

Fig. 5-1:
VRB=VCC-0.7V
IB=(VCC-0.7V)/RB
IC=(beta)*IB (assume beta around 150-200)
VRC=IC * RC
VC=12V-VRC
VCE=VC-VE=VC-0=VC


Fig. 5-2:
IB=(VCC-0.7)/(RB+beta*RE)
VRB=IB*RB
IC=beta*IB
VRC=IC*RC
VC=VCC-VRC
VCE=VC-VE=VC-VRE where VRE=IC*RE

Fig. 5-3:
VB=VCC(R2/(R1+R2))
VE=VB-0.7
IE=IC=(VE-0)/RE
VRC=IC*RC
VC=VCC-VRC
VCE=VC-VE

Fig. 5-4:
VB=0.7
IE=IC= (VCC-VBE)/(RB/beta+RC)=(VCC-0.7)/(RB/beta+RC)
VRC=IC*RC
VC=VCC-VRC

And here's a pdf of the above forumulas and the Transistor Pinout shown below:
Biasing Formulas v18.1.pdf
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Transistor Pinouts.jpg
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White Board Screen Shot from Lab:
White Board Pic CE Amp_2020-1112_IMG_2182.jpg
White Board Pic CE Amp_2020-1112_IMG_2182.jpg (2.33 MiB) Viewed 3151 times
edmedina0001
Posts: 54
Joined: Fri Sep 16, 2022 5:19 pm

Re: Week #6: Transistor Biasing

Post by edmedina0001 »

EET-200L
Evan Medina
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jmszczygiel0001
Posts: 22
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Re: Week #6: Transistor Biasing

Post by jmszczygiel0001 »

Lab #6
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pagarcia2101
Posts: 63
Joined: Thu Sep 23, 2021 9:12 am

Re: Week #6: Transistor Biasing

Post by pagarcia2101 »

Lab 6 10/18/22
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jrvicenty2101
Posts: 65
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Re: Week #6: Transistor Biasing

Post by jrvicenty2101 »

Week 6 Jorge Vicenty
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rpoznyur2101
Posts: 65
Joined: Thu Sep 08, 2022 10:49 pm

Re: Week #6: Transistor Biasing

Post by rpoznyur2101 »

Lab
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Jbraco0001
Posts: 44
Joined: Fri Sep 06, 2019 9:43 am

Re: Week #6: Transistor Biasing

Post by Jbraco0001 »

EET 200
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vaseleznev2001
Posts: 59
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Re: Week #6: Transistor Biasing

Post by vaseleznev2001 »

Vlad Seleznev
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rjstrange2101
Posts: 48
Joined: Fri Sep 09, 2022 12:30 am

Re: Week #6: Transistor Biasing

Post by rjstrange2101 »

Week 6 Submission
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ncfutrell0001
Posts: 35
Joined: Tue Sep 06, 2022 11:55 am

Re: Week #6: Transistor Biasing

Post by ncfutrell0001 »

~Nate Futrell
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