In this instructable i hope to be able to show you how to make a simple toy piano using a 555 timer ic and a few basic components. This my first electronics project on perfboard and there are probably much more sensible ways of laying out the parts, it would have been easier to set them apart more but i didnt do that.

Step 1: What You'll Need

6 x 1K resistors
6 x small buttons
1 x 10k resistor
10u and a 100n capacitor
555 timer chip
8r speaker
small piece of perfboard
battery clip and switch
wire leads
solder + iron
470 ohm resistor and a led

I'm bread boarding this circuit. The basic astable oscillator portion is no problem, but when I wired a switch in (a normally open momentary switch) it behaves the opposite of how I expect (there's a constant tone, and when I press the button it interrupts the tone.). Any ideas?<br>Thanks very much
Sir.. Where should i use the potentio meter?
<p>Why did you replace the 1K Ohm resistor with a 2K Ohm trimmer potentiometer?</p>
<p>To allow it to be a bit tunable and increase the range of pitches it could play</p>
<p>Okay, now i get it. Thank you! :)</p>
<p>hello and thank you to you for your project. I have a big problem. I have reproduced the same thing but no sound . Why? I tried to replace some components but they function all well. Thank you in advance for your answer.<br>Victor</p>
Just checkout any fault in soldering.
<p>Are the buttons orientated correctly? do get get different voltages going coming from the buttons when you press them? have you tried configuring the 555 as an astable oscillator so you can test that the speakers are working and you have enough power to drive them? also double check every connection is correct, almost all the problems I have with electronics are due to incorrect assembly and a circuit rarely works first try. hope this helps, all the best</p>
<p>if i connect a led it wont produce sound without led its working fine what can be the issue?</p>
<p>What value resistor did you use? does the LED light up? </p>
<p>What is the recommended battery voltage to use?</p>
http://www.ti.com/lit/ds/symlink/lm555.pdf<br>the operating voltage for a 555 timer is 4.5-16v so any that outputs between them, 9v is probably easiest or 4 AA's would work and last longer. <br>
There is a beep sound every second ,even without pressing the switches . any idea how to eliminate the beeb sound plz ?
<p>Any idea how to make it a touch piano using LDR replacing switch? According to logic LDR reduces resistance in light, so how can LDR be used to play sound only when we put finger on LDR?</p>
<p>can we use piezzoelectric buzzer here? instead of a speaker?</p>
<p>I don't think that would work. The buzzer only produces one sound. The speaker would produce the different tones of the &quot;piano&quot;. Good luck!</p>
nice instructable....... I added a LED to..
<p>Hey....This has been very helpful for my project,but den may i know how i could do d same using an arduino board ?</p><p>Thanks in advance :)</p>
<p>Hey...This has been very helpful for my project, but may i know how i could do d same using arduino?</p><p>Thanks in advance!</p>
<p>could you decribe the working of the circuit</p>
<p>Hey, would this still work with a 100u capacitor in the place of a 10u?</p>
Hey this project is superb... Could u plz upload the video...i wanna listen the sound when different keys r pressed...I Need this idea to implement on Piano Staircase but need some help from u.....Could u plz guide me for what changes i need to do....I wil be using it for 10 to 12 steps...and wanna connect a high power speaker and supply...Wil the sound be differentiable n clear....? plz do help...
Hello, can you tell me what's the value in numeric code is printed on a 100n ceramic capacitor (like :104 or and other number for 100n). And tell me which type of resistor the 10k resistor is it's variable or simple the circuit shows the resistor is variable but you have used a simple resistor ? give a clear answer please!
Hi, nice one. hey, did you know that pianos have the black keys? if so, how do i add buttons on it to make it like a real piano. <br>
i made a better version which includes the black keys and is in theory tune-able<br> <br> <a href="https://www.instructables.com/id/Atari-Punk-Organ-a-simple-555-synthesizer/" rel="nofollow">https://www.instructables.com/id/Atari-Punk-Organ-a-simple-555-synthesizer/</a>
Extremely useful..tnx it works perfectly n ya u can add extra switches if u want! <br>Adding a pot btwn speaker n capacitor can help in tuning the piano as per ur requirements!
Made mine with a smal through-hole piezo buzzer instead of a speaker, but i wish there where a simple and cheap way to give it some nice enclosure, any tips or ideas?
hello, i built this and everything works great, but i was wondering if there is any way to hook up LEDs to individual buttons. I have been trying and it's either one works or the other. Any suggestions?
I like the Kalimba Idea! Very funny!
Nice one took me a few try's to get it right but this was a nice project i had fun and my kids did after i was done. Good work thanks for the project
if more buttons are inserted, do we need more voltage than 9V? and can we use any speakers beside 8&Omega;??? thanks
you could still use the same battery, i have made another one thats more complex and that has more buttons and runs on only 6v. i have uploaded it to instructables
is the 10K resistor a potentiometer? And if it is one, how do you connect pin 1 to the gnd?
yes it is, i didnt have one so left it out, the pins are conected line in the schematic and the arow represents the middle pin
anyway to sustain the notes for a period of time?
only by holding down the button, unless you used a microcontroller or much more complex circuit
how much does this cost in the end?
i allready had the speaker and buttons, 555s cost around 20p and the rest of the components are cheap so probably 2 or 3 pounds if you bought it all separatly
thank you very much .. I got it now ^^
thank you guys I've just finishing the circuit and it works ^-^<br><br>but I really wanna understand the concept of how the buttons works and how each button makes a different sound ?<br>
when you press a button it makes electricity flw throughthe resistor into the chip, the further allong the buttons the highe the resistance as the electricity has to go through more, the resistance is what defines the musical note, you could substitute the buttons for a potentiometer and have smooth gaps between the notes
hi,can i have PCB of this beautiful project,please please :)
8r means 8 ohm, i think it stands for resistance, you can buy them online or dig one out of a cd player, i have used other values but i don't know if that is bad for them although it seams to work
I suppose that more buttons could be added no?

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