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
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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...
This project fits more for custom made battery casing that can have more space to hide things inside. This switch with few alterations can be used for any other project as well but is designed based on e-bike needs! This project use a clever functionality of....
The circuit described here uses ultrasonic oscillations and operates based on the propagation velocity of these oscillations in the air. Thus, we can easily determine the distance of two points if the time within which the wave travels this distance is....
Sometimes the precious metals are hidden too deep and are not detected except with complicated devices. In many cases, however, small pieces of precious metal buried near the surface can be detected by relatively simple means. Everyone is very attractive to....
Many times for various reasons we forget or can not water the plants that we have in our homes. And many humidity sensors units just notify us with a beeping sound or with a flashing light, that the pot needs watering. But what if we are away from home? This....
The principle behind a metal detector is really very simple. Proof of this is the circuit that follows, in which it proves that the construction of a metal detector can be done in the minute, with few components that we find very easily everywhere. With the....
The sub-harmonic bass generator is a sound producing unit for guitars. The sound it produces looks very much like that of the bass guitar. The octave generator is sometimes quite unusual since it does not produce any of the usual ways of coloring the sound,....
In the past the sounding (sea bottom measurement) was done with the "bullet", that is, with a heavy lead object that the seamen plucked into the sea hung from a calibrated rope. As soon as the "bullet" reached the bottom, the depth appeared directly from the....
This Amplifier was designed to have the following specifications: Distortion less than 0.1% at full power of 100W even at 20KHz. Power has to be attributed to an extended bandwidth. The output transistors must be protected against short circuits. The power....
A series of LEDs serve to alert the gardener when plants need water. Using two conventional digital integrated LEDs and a series of LEDs, we make a very useful device for gardening. The device detects the amount of water in the pot and alerts the grower.....
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