For the final project of Electronics for Computer Engineers course, I designed and built a dual setting sound generator that used two NE 555 IC’s to generate a fully adjustable tone. The NE 555 IC is a famous chip that is often used as a timer or clock cycle generator. It can generate signals with high or low frequencies, depending on how it is wired. The time interval can vary from microseconds to hours. In this project I used a NE 555 IC as a timer to alternate between two different frequencies at an adjustable speed. I used a second IC to further modify the tone of the final output. The output of the first IC would be the input of the second one. Using two variable resistors the user is able to adjust the duration of the signal and the tone of the signal at each stage. In other words, the first variable resistor would adjust the frequency of the first IC which changes the duration of high and low and the second one changes the frequency of the second IC which changes the tone of the final output.
This project helped me review and expand my knowledge of electronic concepts and utilize the theoretical knowledge for a practical application. I had to study the internal circuit of this particular chip, to be able to fully comprehend its role in electronic circuits. I find it fascinating how an specific combination of components that are commonly used, can be placed inside a single tiny chip and be used for so many practical applications purposes. Below are some pictures from different stages of the process, along with the link to view a demo of the sound generator.