Introduction: LED Sync to Music + LCD Display

About: DIY hardware maker and Innovator

The LED sync to music audio amplifier system is a fun project to build in your spare time. Join me as we build this system following the steps below.


You can get all components at your local store in your region or you can buy online: Zaye Electronics

1. Unused 4 Litre lidded oil container/gallon.

2. 16x2 LCD unit x1

3. 4 or 8 ohm Speaker x1

4. LM386 Audio amplifier + Socket x1

5. Resistors (4.7k, 2.2k, 100, 10k, 510)

6. Capacitors (100uf/25v x4, 10uf/50v, 22uf/25v x2, 2200uf/50v, 0.1uf x2, 22pf x2)

7. 10k Variable resistor x2

8. 5v Voltage regulator x1

9. TIP 31C x2

10. Step-down transformer 12v x1

11. LED’s x21

12. IN4007 diode x4

13. 20Mhz crystal oscillator

14. Vero board

15. Switch

16. 2-Pin terminal block x1

17. PIC16F877A Microcontroller IC + Socket

18. PICKIT 3 or any other available PIC programmer.

19. MPLAB X software

20. Heat sink x3 (optional)

21. Bolts + Nuts x6

22. Hot glue + gun

23. Soldering iron + lead

24. Multimeter

25. Jumpers

26. Header pins

Step 1: Gather All Necessary Materials and Components

Step 2: Draw the Circuit Diagram

Step 3: Assembling the Power Supply Unit:

1. From the circuit diagram.

2. Prepare the vero board and solder the 2pin terminal block (which would be used to connect the transformer).

3. Insert and solder the IN4007 diodes in full cycle configuration.

4. Insert and solder the 100uf capacitor

5. Insert and solder the 2.2k resistor and LED.

6. Identify both the +VE and GND connection.

7. Use the multimeter to test the output voltage (Ensure it reads 12v regulated DC supply).

Step 4: Assemble the Audio Amplifier Unit:

1. From the circuit diagram.

2. Insert and solder the LM386. (Solder the socket first before inserting the LM386 IC).

3. Solder the rest of the components as seen on the circuit diagram.

4. Make sure all circuits are grounded.

Step 5: Assemble the LED Sync Unit:

1. From the circuit diagram.

2. Insert the TIP 31C ic and solder

3. Insert and solder the 4.7k resistor

4. Make sure all connections are grounded

Step 6: Assemble the LCD Unit:

1. From the circuit diagram.

2. Insert and solder the 5v voltage regulator.

3. Insert and solder the PIC16F877A (Solder the socket first without the IC)

4. Insert and solder jumpers on the LCD and the PIC16F877A as seen on the circuit.

5. Insert the 10k variable resistor (which would be used to increase/decrease LCD brightness)

6. Make sure all connections are grounded,

7. Open MPLAB X IDE on your PC and enter the code

8. Compile and run the code.

9. Insert the PIC16F877A on the PICKIT 3 programmer and connect to the software on your PC.

10. Ensure the PIC16F877A is powered, use the inbuilt power from PICKIT 3 software.

11. Program the PIC16F877A IC.

12. Remove and Insert the PIC16F877A IC in the socket on the veroboard.


Step 7: Harmonize All Units:

You should have 4 units (Power unit, Amplifier unit, LED sync unit, LCD unit).

1. Identify both +VE and GND for each unit and connect all to the power supply unit (Note that the LCD has a regulated supply, connect the +VE to the 5v supply).

2. Ensure all units are powered.

Step 8: Prepare the Container

1. Draw an outline around the speaker, LED’s and LCD positions on the container

2. Use a cutter to cut out the holes. You can use the soldering iron for the LED outlines.

3. Insert holes for the volume, switch, audio jack and LED indicator

Step 9: Test and Enjoy Your Music.

Step 10: Assemble and CONGRATS!!!

Step 11: Video

Here is the video link on YouTube: Amplifier

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