A Stylophone

Posted on Feb 6, 2014

The schematic that this is based on is my own, so it is free from Intellectual property restrictions. It is based around a 555 timer (so it could be an extension of the recent `Know Your 555 timer` article), and uses an ubiquitous LM386 audio amp so it can have enough volume to stand out from the crowd. As with all of my projects, the PCB is designed for etching yourself, and there are no components

A Stylophone
Click here to download the full size of the above Circuit.

that are difficult to source - in all, the Stylophone can be constructed for less than about $30AUD. There is a breadboard area on the PCB, so you can add your own tremolo, or even an AtMega168 chip if you feel inclined. Allowing you to create the ultimate in digital analog fusion! (Sorry - I couldn`t resist) :-) I built this whole project once, and it worked perfectly. However, a year later, I`m trying to use the base monostable circuit to produce a set tone. For some reason, it only clicks once when hooked up, and the chip got hot enough to burn me. I`ve checked all wiring and capacitor orientation many times. Any ideas what`s going on This is a terrific project! great use of the 555, I have a question: is it posible to replace the resistive divider with an unassembled slide potentiometer like the one used in the tic tac tunes project ( If so, what should be its value the total resistance of the tune bank I am making this project, doing the PCB design in KiCad at the moment. So, there is a problem that can`t be solved: I simply can`t fill the piano keys. When choosing zone properties, they all should be connected to the ground, right If it`s so, connector P5 (which in the `real` circuit is the pen) is used for `grounding` the circuit Besides, I am curious about two other thing: why is the connector Stylus connected to timer`s pin 3 if in the `real` circuit is left unused Should Stylus and P5 be connected on the back side...

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