Instructables
This is my Atari punk organ, it is a 555 timer piano run through an Atari punk console monostable generator, the piano is based on another instructable I made: http://www.instructables.com/id/How-to-make-an-electronic-piano-with-a-555-IC/
i
t has 2 speakers which both play different sound at the same time, which makes an interesting sound and it is tunable using the trimmer potentiometers so you could in theory make an accurate scale, the notes are also layed out like on a piano.
Another feature is a potentiometer that controls pitch bend and a rotary switcjh to change the capacitors on the organ, changing the sound.


 
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Step 1: Video

Picture of Video
This is a video showing what it sounds like:

Step 2: What you'll need

What youll need to make this:
2x 555 timer chips
2 speakers
10k + 100k potentiometers
20 buttons
20 2k trimmer potentiometers
10n, 100n, 47n and 2 10uf capacitors
rotary switch
switch
large perfboard (or you could make a printed circuit board)
assorted wire and battery clip
glue, cable tie and cork

Tools:
soldering iron
wire cutters/pliers
probably desoldering pump/wick
screwdriver for the trimmers

Step 3: The piano circuit

The piano circuit is based of a circuit diagram made by Collin Mitchell, the keyboard is connected through pin 2 and pin 3 goes to both the speaker and the atari punk module, I used jumpers on both sides of the perfboard and attached the battery clip to the 1 and 8 pins, i used  hot glue to stop them breaking from stresses due to movement, the speaker is glued to the bottom of the boardwith bostik and acts as one of the legs. 
The 100n capacitor is replaced by the rotary switch, with three capacitors connected. the wire from 6/2 goes to one of the middle termnals and other capacitors you want to use are connected to the other terminals of the switch and to ground. I used 100n, 47n and 10n capacitors but you could use more different values.
ZsoltF117 days ago

please draw the complete circuit :)

yyun36 months ago

wow~ awesome!!! im so interested this organ. can i get a blueprint?

i wanna make it. my email add is yeohwan07@gmail.com

hcastillo16 months ago

Hi, I'm so interested in this project. I want to make one for me but I want to ask you some questions. First if you have more pictures of the circuits, because I don't understand how are conected some parts of the system. Second, how are connected the speakers? Because I want to make maybe, my own array of speakers or let an output to connect a 3.5 jack. And maybe, I will make a pre amp for the organ. Thaks for this great project.

eli24110 months ago

hey dude? what if i remove the atari punk part of the circuit? what do i change in this circuit? :) this would be a great help for our electronics project! :D

if you want to remove the atari punk part in the circuit, you can use this simple circuit, the simple toy organ

555 TIMER TOY ORGAN.gif
eli24110 months ago

hey dude? what if i remove the atari punk part of the circuit? what do i change in this circuit? :) this would be a great help for our electronics project! :D

Can you send me the blueprint to this??
It would help a lot.
mrmerino2 years ago
What's the monostable bit for?
Please can the topic starter or anybody help me out with the circuit diagram for the entire organ ! Please
Please help me asap I am opting this for my College project.
nonekiller2 years ago
Is there any way I could get a schematic of the whole project not just two different? Nice project Btw, i liked your loved your last one.
josh13242 years ago
Excuse me, but the picture in step 5 is mine. I don't appreciate it's use without my permission. The least you could've done was give me credit.
sholtob (author)  josh13242 years ago
im sorry, i got it off a website called synthtopia and it has a link on the picture to robthefiddler.com that i presume it was on first, i thought that the link on the picture was enough credit but i will give credit to the website in the instructable
well, the picture isn't entirely mine, but I have made modifications to it (the output terminals and the coloured resistor. Here is the original page from www.robthefinder.com: link. You may notice that the resistor is not colored, and there is no ground for the output.
sholtob (author)  josh13242 years ago
you didnt give credit to him at all, and what you changed is allmost negligable
the link in the picture is his/her credit, but you still took the picture directly from my instructable.
sholtob (author)  josh13242 years ago
i assumed that you made it, i didnt bother to look that your username was different
Okay, it's fine. But you should always PM the member before using a picture from the instructable.
sholtob (author)  josh13242 years ago
i will do in future
pfred22 years ago
I like it! I used to make 555 noise makers all the time. I never made one this elaborate though. One thing I have found making audio oscillators with 555s is the capacitor you use to trigger them really matters. As in the same values of different types can get you different sounds. I know it doesn't sound like it makes much sense, but I've noticed a dramatic difference in tones myself.

My favorite capacitors were these clear plastic ones what I could see the silvery foil inside. They just sounded the best to me. Try ripping apart a bunch of old radios, I think that is where I got mine from. I'm not sure if they are available to buy today, or even what they are called if they were.

They might be polystyrene though. yes, this is them:

http://praudio.com/site/wp-content/uploads/2010/05/polystyrene-caps-pic1-500-85.jpg

Some of those can sound really good. Electrolytic can caps are kind of nasty. Maybe you can put in a rotary switch where you can change the capacitors you use? I've made 555 timer things like that. It is pretty cool.



sholtob (author)  pfred22 years ago
yeah the rotary switch im using has 6 pins and im only using 3 so ill probably add some more capacitors to it at some point
pfred2 sholtob2 years ago
If you can find any clear polystyrene ones check them out.