Toy Organ Circuit using Transistors

Sound can be made using very few electronic parts.

This Toy Organ Circuit using Transistors shows how music is made electrically.

The circuit uses only two transistors and simple components.

So here no IC, no coding and no complex parts are needed.

When different push buttons are pressed the different sound tones are produced.

Because of this, it works like a small electronic music keyboard.

Finally, this project is easy with low cost and good for learning basics.

Circuit Working:

Parts List:

When 9V power is given the circuit starts working.

The two BC547 transistors turn ON and OFF again and again.

This action is called oscillation.

Capacitors charge and discharge continuously.

Because of this the square wave signals are produced.

Then the signals go to the speaker through the output transistor and sound is heard from the speaker.

When a switch is pressed the resistance value changes.

So the frequency changes and different musical sounds are produced.

Finally, the LED blinks showing the sound pulses.

How to Build:

To build a Toy Organ Circuit using Transistors follow the below connection steps:

• First take all components as shown in the circuit diagram.
• Collector of Q1 connects to R8 and C1.
• Then base of Q1 connects to the junction of R11 and C2.
• Emitter of Q1 connects to ground.
• Next collector of Q2 connects to speaker, LED and R10.
• Base of Q2 connects to C2 and R9.
• Emitter of Q2 also connects to ground.
• One pin of switch S1 goes to common ground.
• The other pin of S1 connects between R1 and R2.
• Finally, the same connection method is used for switches S2 to S7.

Conclusion:

This Toy Organ Circuit using Transistors is very simple to make.

No IC and no microcontroller is used.

So it helps to understand oscillator working.

This project is good for students and hobby learners.

It is also a fun way to learn basic electronics.

References:

Datasheet BC547