# CU-Boulder PHYS 3330 - prelab 7 (2 pages)

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## prelab 7

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## prelab 7

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Phys 3330 - Electronics for the Physical Sciences
##### Electronics for the Physical Sciences Documents
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Prelab 7 Bipolar Junction Transistors Omkar H Ramachandran March 1 2018 1 1 1 Biasing the Transistor Finding the Quiescent voltages VB 15R2 10 2 63 V 15 R1 R2 57 VE VB 0 6 2 03 V Finally at saturation VCE 0 IC VCC VE 15 2 03 4 733 mA RC 2 74 103 1 IE IB IC IC 1 hf e hf e 200 for our transistor Thus IE 4 733 1 2 1 1 200 4 756 mA Power Emitted 2 P IE RL 4 756 10 3 2 2 74 103 61 9 mW which is well below that maximum PD of 625 mW 1 3 What s the point of the capacitors C1 and C2 are set up to ensure that the bias condition is not affected by external components as they will only pass AC current to the transistor 2 2 1 Transistor Amplifier Maximum hf e From the data sheet we know that the maximum value of hf e is 200 1 2 2 What is the maximum overall gain G 2 3 RC 2 74 2 74 RE 1 What are the maximum and minimum output voltages Since VE VB 0 6 min VB 0 6 min Vout 1 644 V The maximum voltage is dictated by the rail voltage which is 15 V 2 4 What are rin and rout rin RE hf e 200 103 rout RC 2 74 103 2 5 Gain for specific condition When RL 560 Vout VE 560 0 169VE 2 74 103 560 Thus 16 9 of the initial amplitude will be preserved 3 Transistor Amplifier Dual Stage Ran out of time Will complete by the time the lab starts 4 Audio Amplifier According to the table my phone s output impedance is 3 45 Again ran out of time Will finish by the time the lab starts and resubmit 5 Lab Activities 1 Step 6a seems to be the hardest given that we re working with a small load in parallel thus increasing the possibility of noise 2 I m still very shaky on transistors in general I ll update this once I do more reading and resubmit 2

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