Designing an amplifier circuit

We wish to design an amplifier circuit for possibly audio signal amplification where the input small signal is fed from a microphone and the output is connected to a speaker. One important characteristic of a microphone is its output impedance. This is a measurement of the AC resistance looking back into the microphone. Generally, microphones can be divided into low (50–1,000 Ω), medium (5,000–15,000 Ω) and high (20,000+ Ω) impedance. The speaker has an impedance of 8Ω and power wattage of 0.5 watts. The amplifier design will employ BJT’s only as transistors. Most probably your amplifier will comprise of cascaded BJT’s in different configurations (common emitter, common base and common collector) so that the following requirements are met. a. Appropriate Voltage Gain with sufficient room for both positive and negative swings so that the audio signal is hearable. b. Current Gain according to power requirements at the output. c. Input output and intermediate Impedance Matching Since, the input signal has a bandwidth with lower cutoff frequency of 50 Hz. Therefore, there is need to perform a frequency analysis and design the values for the coupling and bypass capacitors so as to define low cutoff frequency. Give a detailed design in black and white based upon the concepts discussed in the class for amplifier design using transistors.

by alishbalis
May 26, 2023

No Answers

No answers yet. Contribute your answer below!

Your Answer

You must log in or create an account (free!) to answer a question.

Log in Create an account

Go Ad-Free. Activate your CircuitLab membership. No more ads. Save unlimited circuits. Run unlimited simulations.

Search Questions & Answers

Ask a Question

Anyone can ask a question.

Did you already search (see above) to see if a similar question has already been answered? If you can't find the answer, you may ask a question.

About This Site

CircuitLab's Q&A site is a FREE questions and answers forum for electronics and electrical engineering students, hobbyists, and professionals.

We encourage you to use our built-in schematic & simulation software to add more detail to your questions and answers.

Acceptable Questions:

  • Concept or theory questions
  • Practical engineering questions
  • “Homework” questions
  • Software/hardware intersection
  • Best practices
  • Design choices & component selection
  • Troubleshooting

Unacceptable Questions:

  • Non-English language content
  • Non-question discussion
  • Non-electronics questions
  • Vendor-specific topics
  • Pure software questions
  • CircuitLab software support

Please respect that there are both seasoned experts and total newbies here: please be nice, be constructive, and be specific!

About CircuitLab

CircuitLab is an in-browser schematic capture and circuit simulation software tool to help you rapidly design and analyze analog and digital electronics systems.