The provided audio transcript discusses the process of designing a multi-stage transistor amplifier circuit. The speaker covers various aspects of this process, including the identification of transistor configurations, calculation of DC parameters, determination of voltage gain, and verification of the amplifier's performance.
The transistor configurations discussed are the common base, common collector, and common emitter configurations. The speaker notes that the common emitter configuration is identified by the absence of input or output connections on the emitter of the transistor.
The speaker then discusses the process of setting DC parameters for the circuit, which are determined by the base-emitter voltage and the collector current. The speaker also mentions that the AC parameters are dependent on these DC parameters.
The speaker calculates the voltage gain for each stage of the amplifier. The gain is determined by the ratio of the output voltage to the input voltage. The speaker calculates the gain for both stages of the amplifier separately and then multiplies these gains together to find the total gain of the circuit.
The speaker also discusses the process of determining the load lines for a multi-stage amplifier. The load lines represent the range of input and output voltages that the amplifier can handle without distorting the signal. The speaker calculates the saturation and cutoff points for each stage of the amplifier and plots these on a graph to create the load lines.
Finally, the speaker verifies the performance of the amplifier by applying a DC voltage to the circuit and measuring the output voltages. The speaker also applies an AC voltage to the circuit and uses an oscilloscope to observe the phase relationships between the input and output signals.
In summary, the speaker provides a detailed explanation of the process of designing and verifying a multi-stage transistor amplifier circuit, including the identification of transistor configurations, calculation of DC parameters, determination of voltage gain, and calculation of load lines. The speaker also provides a step-by-step guide to verifying the performance of the amplifier using both DC and AC voltages.
1. The text covers multiple stages of transistors to improve gain, either voltage or current.
2. The DC parameters are determined before computing AC, as the AC works off of the DC parameters.
3. The circuit has two transistor stages, T1 and T2, with common emitter configurations.
4. The circuit uses resistors and capacitors to create voltage and current paths.
5. The transistor stages are connected in such a way that the output of one stage is the input of the next.
6. The voltages and currents in the circuit are determined using Ohm's law and Kirchhoff's laws.
7. The circuit uses a voltage divider formula to determine the voltage on the base of the transistors.
8. The circuit uses a voltage gain formula to determine the gain of each stage.
9. The total gain of the circuit is the product of the gains of each stage.
10. The circuit uses a multimeter to measure the output voltages with more accuracy.
11. The circuit uses an oscilloscope to visualize the phase relationships and voltage gains of each stage.
12. The circuit uses a Veitch trace method to measure the voltages from the bottom trace to eliminate the thickness of the line in the measurement.
13. The circuit uses a 2N 3904 transistor, which has a minimum beta of 100.
14. The circuit uses resistors with specific values, such as 56K ohms and 8.6K ohms, and capacitors with specific values.
15. The circuit uses resistors to create a parallel circuit with a total resistance of 4.1K ohms on the base of the transistors.
16. The circuit uses resistors to create a parallel circuit with a total resistance of 1.47K ohms on the lower portion of the circuit.
17. The circuit uses a 120 ohms resistor in parallel with the 4.1K ohms and 1.47K ohms resistors to create a total resistance of 1.35K ohms.
18. The circuit uses capacitors to create a coupling capacitor, which is in series with the input and output of the circuit.
19. The circuit uses capacitors to create a bypass capacitor, which is in parallel with a resistor to improve the fidelity of the circuit.
20. The circuit uses a 120 ohms resistor in parallel with the 2K ohms and 5.6K ohms resistors to create a total resistance of 1.35K ohms.
21. The circuit uses a 120 ohms resistor in parallel with the 2K ohms and 1.35K ohms resistors to create a total resistance of 1.35K ohms.
22. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
23. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
24. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
25. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
26. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
27. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
28. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
29. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
30. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
31. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
32. The circuit uses resistors and capacitors to create a voltage divider, which is used to determine the base-emitter voltage of the transistors.
33. The circuit uses a voltage divider formula to determine the base-emitter voltage of the transistors.
34. The circuit uses resistors and capacitors to create a voltage divider, which is