Today in lab I learned about a popular chip, the 555 timer. This chip allows us to generate different output signals by simply changing the values of resistors and capacitor. In the below circuit you can see the chip in action. I have connected a speaker to the output and the result was a buzzing sound from the speaker. With the twist of the potentiometer, the frequency output by the speaker was changed.
As you can see in the picture below, when the resistance of the potentiometer is changed the frequency as well as the duty cycle is affected.
For the second circuit, we used an op amp to condition an audio signal output from the computer. We first used the oscilloscope to see the signal being generated by the computer.
Similar to the previous circuit, when the potentiometer is turned, the output is affected. This time the amplitude of the signal was amplified. As you can see in the below picture, the tops and bottoms are now flat because of the limited power being input to the op amp chip.
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