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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 elect...
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 switc...
I started of by making the circuit on a breadboardso i could see how it worked and how to fit it onto the perfboard
i soldered the ic straight onto the board, it would have been more sensible to use a socket to plug it into but i didnt have one.in this step i also s...
i first layed out the buttons in a line across the top. i had to leave room for the resistors to go along the top so i left two spare rows above the b...
to make the piano work you need to add the 1k resistors between the points of the button. Then use a solder bridge to conect the parts up underneath t...
i conected the 10k resistor to the last button. the black circles represent where the battery leads are going to go
i added a jumper wire from pin 7 to a hole next to the 10k resistor, i added the last 1k resistor and soldered it next to he end of the jumper wire an...
i attached jumpers going up to the positive terminal from pins 4 and 8. i will make a solder bridge underneath the board to connect together all the w...
pins 2 and 6 need to be connected and then attachd to the negative end of the buttons. the 100n capacitor is also placed beside the two jumpers. th le...
ran out of space on top of the board so a jumper so i connected pin 1 to the ground wire using a jumper under the board
i attached the speaker to pin 3 of the chip through the 10u capacitor, and put the other wire through a hole above the ground wire and soldered it in....
put the wires from the battery holder into the board. into the black holes we marked earlier. the positive goes in the left hole,negative in the right...
It now should work, check all your joints and work through the schematic, making sure you put it together right, then take a deep breath and plug in t...
Cut he red wire between the battery and the board, strip the ends and solder them to the prongs of a switch. one to the middle and one to the outside ...
Adding an led that shows when it is on is useful as this circuit gives of no sound when i not being played, a led will stop you forgetting to turn it ...
This circuit is incredibly easy to modify as its so simple, you could replace a resistor with a LDR to create a solar therimin, or change the resistor...
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