PIANO CIRCUIT (TOY ORGAN) WITH CIRCUIT DIAGRAM

CIRCUIT DIAGRAM

555 timer IC is operated in astable multivibrator mode. The supply voltage VCC is 6V. Six 1k resistor connected in series. Second and sixth pin shorted to allow retriggering of 555 timer IC after every timing cycle. These two pins are grounded through a capacitor. Fourth pin is reset pin it is shorted with eighth pin i.e. VCC to avoid sudden resets. Seventh pin is discharge pin. It is connected to series resistors through a variable resistor. Output is taken from third pin. The obtained frequency is applied to the 8ohms speaker through a 10microfarad capacitor.This circuit produce different types of tones and sounds through the speaker when the push bottons are pushed. This is because the output frequency from the 555 IC varies with the resistance.

                                                                                    

OUR PRACTICAL WORK SAMPLE  (IJTOMTECH) 

The image above is to show that we have build the circuit and it worked perfectly. Sure you can build it too.