🔊 Music Box Circuit Diagram (Using CD4017 and 555 Timer IC)

How are you all? Hope you are well. By the grace of Allah, I am also well. I am @imranhassan, a student who is interested in learning electronics and loves to teach. Today I am sharing a completely hand-drawn music box circuit diagram where CD4017 and 555 Timer IC are used. I have divided the entire circuit into 4 steps and hand-drawn it so that beginners can easily understand.

🛠️ Components used and their functions

🔹 CD4017 (Decade Counter IC):

Edited with Canva.

It generates the clock output of the signal and sends the signal to the next stage.

🔸 555 Timer IC:

It acts as the timing control part of the circuit, which generates the signal at the right time.

🔹 80Ω Speaker:

It acts as the main output device of the circuit, where the music sound output comes from.

🔸 Resistors (R1, R2, R3, etc.):

These are used to configure the timing and control the signal strength.

🔹 Capacitors (C1, C2):

These components help in filtering the signal and maintaining the stability of the circuit.

🔸 Diodes (D1 to D8):

Used in the signal path to block reverse current. This ensures the safety of the circuit.

🔹 Battery 6V

Use: Provides the required power to the circuit. The circuit receives power from a 6-volt battery.

🔸 Transistor Q1: TIP29

Usage: Used for signal amplification and output device control. It amplifies the signal received from the IC and sends the signal to the speaker or other output device.

Step 1: Power Supply Connection and Ground Connection

In the first step of this circuit, the 6V power supply is directly connected to the VCC pin (pin 8) of the circuit, which will act as the positive power supply for the ICs. The negative pin of the power supply is connected to ground at pin 1 (GND).

The VCC pin and GND pin of IC-01 (555 Timer IC), IC-02 (555 Timer IC) and IC-03 ​​(CD4017 IC) are all connected to ensure power and ground connections. This helps in maintaining the electrical reliability and performance of the circuit.

Step 2: Resistor and Capacitor Connection

R1 (33kΩ Resistor):

One leg of R1 is connected to pin 6 (Threshold) of IC-01 (555 Timer IC). It is used for the time signal of the timer.

The other leg of R1 is connected to Clock (Pin 14) of IC-03 ​​(CD4017). This pin receives the clock signal, which helps in triggering the output signal.

C1 (10μF/25V Capacitor):

The positive pin of C1 is connected to pin 6 (Threshold) of IC-01 (555 Timer IC), and the negative pin is connected to ground. This will control the timing function properly and will make the output signal from IC-01 perfectly timed.

Summary:

R1 and C1 will create the timing configuration through pin 6 and pin 2. The signal will be properly generated through pins 6 and 2 of IC-01 and sent to the next IC.

Step 3: Connection of Resistors, Capacitors and Diodes

In this step, the connections of R1, R2, R3, R4, R5, R6, R7, R8, R9, R10, C2, and D1-D8 are given, which will ensure the signal strength control and signal filtering of the circuit. These components will help in adjusting the timing and performance of the signal correctly.

R2 to R10 (Resistors):

These resistors will control the signal strength and will be used to properly process the output signal of IC-03 ​​(CD4017). The resistors will ensure the correct signal voltage and prevent any unexpected voltage flow.

D1 to D8 (Diodes):

The diodes will be used to block the reverse current of the output signal of IC-03. This provides protection to the circuit and prevents damage to the IC.

Summary:

In this step, the timing configuration, filtering, signal strength control and protection of the signal are ensured by properly connecting the components R2-R10 and D1-D8. These will help in the proper functioning of the circuit.

Step 4: Connection of Resistors, Speaker and Transistors

In this step, Q1 (TIP29 transistor) and speaker connections are given. Here the output signal of IC-02 (555 timer IC) and IC-03 ​​(CD4017 IC) will be controlled by a transistor, which will provide correct sound output to the speaker.

Q1 (TIP29 transistor):

Pin 1 (Collector) of the Q1 transistor will be connected to the speaker and resistor. The transistor will be used to amplify the signal.

Pin 2 (Base) of Q1 will receive a signal from IC through a resistor. Through this, the output signal of IC-02 and IC-03 ​​will be amplified and will go to the speaker.

Speaker (80Ω):

The speaker will be controlled by the output signal of IC-02, which will produce the correct output through the Q1 transistor.

The speaker will be connected to pin 3 (Emitter) of Q1, which will provide an output signal to the speaker.

Summary:

In this step, Q1 (TIP29 transistor) and the speaker are connected properly so that the signal can be amplified and reach the speaker. The sound is output from the speaker by the output signal of IC-02 and IC-03.

Epilogue

I, myself, have made this circuit using a 555 timer IC, CD4017 decade counter IC, and other components. It is a very simple and effective project which helps in ensuring proper signal processing and output.

This project is arranged with diagrams drawn by me so that everyone can easily understand and follow. My aim was to make an educational and straightforward project, which can be useful for beginners.

CD4017 Decade Counter IC (16-Pin)

Pin Number	Function	Detailed Explanation
1	Output 5	Output 5, Signal Output
2	Output 1	Output 1, Signal Output
3	Output 0	Output 0, Signal Output
4	Output 2	Output 2, Signal Output
5	Output 6	Output 6, Signal Output
6	Output 7	Output 7, Signal Output
7	Ground (GND)	Ground connection of the circuit
8	VCC (Supply)	Power supply, 5V to 15V
9	Output 3	Output 3, Signal Output
10	Clock (Pin 14)	Clock signal input, which activates the IC
11	Enable	IC capability control, signal acceptance
12	Carry Out	Next output signal
13	Reset	Counter reset, reset to zero
14	Output 4	Output 4, signal output
15	VCC (Supply)	Power supply, 5V to 15V
16	Output 9	Output 9, signal output

NE555 Timer IC (IC-01, IC-02)

Pin Number	Function	Detailed Explanation
1	Ground (GND)	Ground connection of the circuit
2	Trigger	Timer trigger pin, for starting the signal
3	Output	Output signal
4	Reset	System reset, usually connected to VCC
5	Control Voltage	For controlling the internal voltage
6	Threshold	Timer threshold pin, for stopping the signal
7	Discharge	Discharging the timing capacitor
8	VCC (Supply)	Power supply, usually 5V or 15V

🟩 Thank you for reading my post and giving your valuable time. Stay well and stay healthy. God bless you. 🟩

Photography Details	📱 Device: Walton Xanon90	📍 Location: Narayanganj, Bangladesh	📷 Captured By: @imranhassan