Figure 2.a shows a transformer-coupled class A amplifier, and Figure 2.b shows the transistor's characteristic. The load connected to this amplifier is s laud speaker with input resistance of R = 42. The sine wave input signal (Vi) results in a peak base current swing of 2mA. Assuming Vcc = 15 V, R1 = 4.0 k 2, R2 = 1.0 k 2, the turns ration of transformer equal to 4, calculate: The ac output power delivered to the laud speaker. b. The efficiency of the amplifier. a. lc (mA) vc 480 420 NIN2 01 300 240 R2 180 120 60 I-lmA 10 15 20 25 VCE (V) Figure 2.a. Transformer-coupled class A transistor characteristic Figure 2.b The transistor characteristic
Power Amplifier
The power amplifier is an electronic amplifier designed to maximize the signal strength of a given input. The input signal strength is enhanced to a high enough level to drive output devices such as speakers, headphones, RF (Radio frequency) transmitters, etc. Unlike voltage / current amplifiers, the power amplifier is designed to drive core loads directly and is used as a storage block in the amplifier series.
Maximum Efficiency Criterion
In every field of engineering, there is a tremendous use of the machine and all those machines are equipped for their popular work efficiency so it very much important for operation engineers to monitor the efficiency of the machine, planning engineers to check out the efficiency of the machine before installing the machine and design engineers to design machine for higher efficiency than and then the utility will procure their products that will ultimately lead to profit and loss of the company. It indicates the importance of efficiency right from the initial stage as manufacturing units, intermediate stage as planning coordinators, and end-users stage as a utility.
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