Synchronous Audio Sdn.Bhd in Kuala Lumpur Case Study - Engineering Assignment Help

Assignment Task:

Task:

Attention All Electronic Engineers!!
I have attended a meeting with our customer, Synchronous Audio Sdn.Bhd in Kuala Lumpur. This meeting discussed a new design of audio preamplifier of public address (PA) system for their new products. Our company has been assigned to analyze and troubleshoot the new amplifier as shown in Figure 1. The details information on the circuit and testing procedure are explained in the following paragraph.

Figure 1: (a) PA System Block Diagram (b) Two-stage Voltage Preamplifier

The circuit consist of 2-stage audio voltage preamplifier. The first stage is a common-emitter pnp with voltage-divider bias, and the second stage is a common-emitter npn with voltage- divider bias. It has been decided that the amplifier should operate from 30V dc to get a large enough signal voltage swing to provide of 6W to the speaker. Because small IC regulators such as the 78xx and 79xx series are not available above 24V, dual ? 15V dc supplies are used in this particular system instead of a single supply. The operation is essentially the same as if a single +30V dc source had been used. The potentiometer at the output provides gain adjustment for volume control. The input to the first stage is from the microphone, the output of the second stage will drive a power amplifier. The power amplifier will drive the speaker. The preamp is to operate with a peak input signal range from 25mV to 50mV. The minimum range of voltage gain adjustment is from 90 to 170.

1. Calculate the theoretical voltage gain of the first stage when the second stage is set for maximum gain.
2. Calculate the theoretical maximum voltage gain of the second stage.
3. Determine the overall theoretical voltage gain.
4. Calculate the circuit power dissipation with no signal (quiescent).
5. For the simulation, the preamp is simulated with a peak input signal of 45mV at 1kHz frequency using professional software such as Multisim, ORCAD, MATLAB and etc. Simulate the preamp circuit and observe the operation with the virtual oscilloscope. Determine the voltage gain of the simulated circuit based on the voltage measurements. Compare the measured voltage gain with the calculated voltage gain.
6. Observe the frequency response of your designed power amplifier.
7. Observe and record all the experimental waveforms results captured from oscilloscope.
As a design team, you are assigned to analyze, simulate this amplifier. You need to present your findings and submit a report to DED executive members no later than 18 December 2020.

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