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Electronic Project II – Mini Challenge on Filters

Posted September 16, 2009 12:00 AM by Jaxy

Using electrical components to create filters for music can be a fun adventure for people of all ages. But before I go giving you all the answers, I challenge you to create your own filter. You can try passing a frequency or music through it.

Calculating Cutoff Frequencies

High-Pass Filter

For the image to the right, the cutoff frequency is calculated:

Cutoff Frequency = 1/(2*Π*R*C)

For the image to the left, the cutoff frequency is calculated:

Cutoff Frequency = 1/(2*Π*R1*C)

Low-Pass Filter

For the image to the right, the cutoff frequency is calculated:

Cutoff Frequency = 1/(2*Π*R*C)

For the image to the left, the cutoff frequency is calculated:

Cutoff Frequency = 1/(2*Π*R2*C)

The Challenge

I have given you some background information (See Electronic Project II (Part 2) – Filters for a refresher on filters) and a couple of equations to get you started. I challenge you to design a high-pass filter that will cut off a low frequency, or a low-pass filter that will cut off a high frequency. You can choose the design to either include or exclude an operational amplifier.

I strongly suggest you test out your circuit by building it. You can utilize Electronic Project I (Part 1) in order to produce a frequency to test your circuit. You can also use this website to pick values for the resistors and capacitors for your 555 timer circuit. In two weeks, I will post possible solutions and discuss how you can pass music through one of these filters so you can hear part of the frequencies in the music being eliminated.

Let me know in the comments section:

· What frequency/frequencies you want to eliminate using a filter?

· Which filter you would use (high-pass filter or low-pass filter)?

o Note: if you choose to try a band pass filter, you get extra points because it is an extra challenge.

· What resistor and capacitor values do you get when using the equations?

· Submit a picture of your design schematic if you desire.

· If you build a circuit to test it out, I am sure the CR4 community would highly appreciate pictures being posted.

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