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The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.?
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The transistor of a class A power amplifier is supplied from a 6V batt...
Analysis of Power Amplifier with Transistor
Given:
- Supply voltage (Vcc) = 6V
- Maximum collector current change (ΔIc) = 30 mA
- Loudspeaker impedance (RL) = 8 ohm
Calculations:
Direct Connection
When the loudspeaker is connected directly in the collector circuit, the power transferred to the loudspeaker can be calculated as follows:
Maximum collector current (Ic) = (Vcc / 2) / (RL / 2) = 6/16 = 0.375 A
Power transferred to loudspeaker = Ic² * RL = (0.375)² * 8 = 1.40625 W
Coupled through a Transformer
When the loudspeaker is coupled through a transformer for maximum power transfer, the power transferred to the loudspeaker can be calculated as follows:
Maximum power is transferred when the load impedance (RL) is equal to the reflected impedance of the transistor (Rc) as seen through the transformer.
Rc = Vcc / ΔIc = 6 / 0.03 = 200 ohm
The reflected impedance of Rc through the transformer can be calculated as follows:
R'c = Rc / (turns ratio)²
Taking turns ratio as n, R'c = 200 / n²
For maximum power transfer, RL = R'c
8 = 200 / n²
n² = 200 / 8 = 25
n = 5
Therefore, the turns ratio of the transformer should be 5.
Power transferred to loudspeaker = (Vcc / 2)² * RL / (RL + R'c)²
= (6 / 2)² * 8 / (8 + 200/5)²
= 1.875 mW
Conclusion:
The power transferred to the loudspeaker is higher when it is directly connected to the collector circuit than when it is coupled through a transformer for maximum power transfer. However, coupling through a transformer can provide impedance matching and isolation between the amplifier and the loudspeaker. The turns ratio of the transformer required for maximum power transfer is calculated to be 5.
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The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.?
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The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.?.
The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.? for Electronics and Communication Engineering (ECE) 2024 is part of Electronics and Communication Engineering (ECE) preparation. The Question and answers have been prepared according to the Electronics and Communication Engineering (ECE) exam syllabus. Information about The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.? covers all topics & solutions for Electronics and Communication Engineering (ECE) 2024 Exam. Find important definitions, questions, meanings, examples, exercises and tests below for The transistor of a class A power amplifier is supplied from a 6V battery. If the maximum collector current change is 30 mA, find the power transferred to an 8 ohm loudspeaker when i) It is connected directly in the collector circuit ii) Also when it is coupled through a transformer for maximum power. Determine the turned ratio of coupling transformer.?.
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