Project Assignment: Six-Band Audio LED Visualizer (Complete Implementation)
You are required to fully design, simulate, implement, and document a Six-Band Audio Level Display System based on analog signal processing principles. The final outcome must be accurate, functional, and professionally presented.
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## Objective
Develop a complete system that:
– Accepts an audio input signal
– Splits it into six distinct frequency bands
– Drives six LEDs, each representing a specific frequency range
– Demonstrates correct behavior through simulation and testing
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## System Requirements
### 1. Circuit Design (MANDATORY)
Design a complete and correct circuit that includes:
#### A. Input Stage
– Audio input (Microphone module or AUX input)
– Signal conditioning (biasing and amplification if needed)
#### B. Filter Bank (Core of the system)
Design six active filters using Op-Amps:
| Band | Frequency Range |
|——|—————-|
| A | 0 60 Hz |
| B | 60 250 Hz |
| C | 250 500 Hz |
| D | 500 Hz 1 kHz |
| E | 1 2 kHz |
| F | 2 4 kHz |
– Use band-pass filters
– Clearly calculate and justify all resistor and capacitor values
– Ensure proper separation between bands
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#### C. Detection Stage
– Convert AC signal to DC using:
– Rectifier (Diode-based or Precision Rectifier)
– Smooth the signal using a capacitor
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#### D. Output Stage
– Each band must drive:
– One LED
– With proper current-limiting resistor
– LEDs must respond to signal strength (brightness or ON/OFF)
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## 2. Simulation (VERY IMPORTANT)
You must:
– Use Proteus or Multisim
– Draw the full schematic clearly
– Label all components and values
### REQUIRED:
Record a video showing:
1. Input signal applied (Function Generator)
2. Changing frequency step-by-step:
– 50 Hz
– 100 Hz
– 300 Hz
– 700 Hz
– 1500 Hz
– 3000 Hz
3. Show that:
– Each LED turns ON only at its corresponding band
The video must clearly prove that the circuit works correctly.
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## 3. Testing & Verification
– Use Function Generator for controlled signals
– Use Oscilloscope (DSO) with FFT if available
– Verify:
– Each band responds to correct frequency
– No overlapping errors
– Clean signal behavior
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## 4. Calculations (MANDATORY)
Provide:
– Filter design equations
– Cutoff frequencies
– Component selection justification
– Bode plots (gain vs frequency)
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## 5. Final Report (Professional)
Structure:
### 1. Introduction
– Project idea and purpose
### 2. Design
– Block diagram
– Circuit diagrams
– Explanation of each stage
### 3. Results
– Simulation screenshots
– Tables and graphs
– Observations
### 4. Discussion
– Problems faced
– Solutions applied
– Improvements
### 5. Conclusion
– Final system performance
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## 6. Evidence Required
– Screenshots of simulation
– Circuit diagram
– Video recording of working system
– Optional: Real hardware photos (if implemented)
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## Important Notes
– The circuit must be fully functional and accurate
– Component values must be calculated, not random
– Simulation must clearly demonstrate correct band separation
– Keep the design efficient (minimum components where possible)
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## Final Deliverables
1. Complete circuit design (correct and tested)
2. Simulation file (Proteus/Multisim)
3. Video showing working circuit
4. Full report ( 10 pages)
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## Expectation
The final system must behave as a real audio spectrum visualizer, where each LED accurately represents its assigned frequency band.
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Request to Prepare a Separate Word Document Components and Circuit Implementation
Please prepare a separate Word document that clearly and professionally includes the following:
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### 1. Bill of Materials (Components List)
Create a well-organized table that lists all components used in the circuit, including:
– Component name
– Symbol (if applicable)
– Value (e.g., resistance in ohms, capacitance in farads, etc.)
– Quantity required
Example format:
| Component | Value | Quantity |
|———-|——–|———-|
| Resistor | 10k | 6 |
| Capacitor | 100nF | 6 |
| Op-Amp | LM741 | 3 |
| LED | – | 6 |
| Breadboard | – | 1 |
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### 2. Circuit Implementation (Step-by-Step Procedure)
Provide a clear and concise step-by-step explanation of how to physically build the circuit in the lab. The steps should be practical and easy to follow, such as:
1. Connect the audio input (microphone or audio jack) to the pre-amplifier circuit.
2. Build the op-amp pre-amplifier stage and adjust gain appropriately.
3. Split the signal into six paths using filters (low-pass, band-pass, and high-pass).
4. Connect each filter output to its corresponding amplifier stage (if required).
5. Add a peak detector (or rectifier) circuit for each channel to convert AC signals to DC.
6. Connect each channel output to an LED with a proper current-limiting resistor.
7. Ensure correct power supply connections for all op-amps and components.
8. Test each stage individually before running the full system.
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### 3. Important Notes
– The procedure must be practical and suitable for implementation in a university lab.
– Use clear and simple technical language.
– Diagrams or small sketches can be added if necessary to improve clarity.
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### 4. Purpose of the Document
This document should serve as a practical guide that explains:
– What components are required
– How to build and connect the circuit step by step
So that any user can replicate the system easily in a real lab environment.
Important note. You must review the Excel file and know the parts available in the college laboratory, and then begin writing and making the electrical circuit.
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