555 timer ic

Toy Organ Circuit using 555 Timer IC

Have you ever tried to design a circuit that produces sound? Here is the Toy Organ Circuit u 555 Timer ICcircuit that produces five tones. This is a simple toy piano circuit with 555 timer. We can also use this circuit as a Machine gun


  • Toy Organ Circuit Principle:
  • Toy Piano Circuit Diagram:
    • Toy Piano Circuit Design:
    • Electronic Toy Organ Circuit Simulation Video:
    • How to Operate Toy Piano?
    • Applications of Toy Organ Circuit:
    • Toy Organ Project Output Video:

Toy Organ Circuit Principle:

Main heart of this circuit is 555timer IC. The 555 timer is operated in astable multivibrator mode. In astable multivibrator mode, the circuit produces accurate free running waveforms, which can be adjusted.

Six 1 kohm resistors are connected in series in this circuit. The circuit has six buttons connected to it. When one of the buttons is pressed, a tone is produced. Six buttons produce six different tones in the same way. That is, it only functions as a toy piano. When the first button from the right is pressed, a high-pitched tone is produced. When the last button is pressed, a low tone is produced. The resistance related to the buttons is the reason behind this. The low thresh hold voltage at the sixth pin hinders the charging and discharging of the speaker’s 10 micro farad capacitor. The voltage at the threshold pin lowers as the resistance value increases, and low frequency goes through the speaker.

Toy Piano Circuit Diagram:

555 Timer IC

Circuit Components:

  • 555 Timer IC
  • 6 Resistors – R1 to R6.
  • Potentiometer – RV1
  • Capacitors – C1 and C2
  • Speaker of capacity 8ohms.

Toy Piano Circuit Design:

The 555 IC is a frequency-generating timer IC. The astable multivibrator mode of the 555 timer IC is used. VCC is the supply voltage. Six 1k resistors are wired in parallel. The second and sixth pins of the 555 timer IC are shorted to allow retriggering after each timing cycle. A capacitor connects these two pins to the ground. To avoid unexpected resets, the fourth pin is shorted with the eighth pin, i.e. VCC. The discharge pin is the seventh pin. Through a variable resistor, it is connected to series resistors. The third pin is used to get the output. A 10 microfarad capacitor is used to apply the acquired frequency to an 8 ohms speaker.

Electronic Toy Organ Circuit Simulation Video:

How to Operate Toy Piano?

To begin, turn on the circuit. Now, from the right, press the first button. It creates a high-pitched tone. Now push the second button, which has a slightly lower pitch than the first. After that, press the next button. Similarly, push all of the buttons to hear the tones they generate. This sounds similar to the tones made by a piano. At a time only one button can be pressed.

Applications of Toy Organ Circuit:

  • It is used to produce different types of tones and sounds by changing the resistor values.
  • We can use it as a best birthday gift for the kids.
  • We can also use this circuit as a Machine gun by changing the resistor and capacitor values.

Toy Organ Project Output Video:


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