I am done making the guitar and installed a pickup on it as well. I\'ve made sur
ID: 1923623 • Letter: I
Question
I am done making the guitar and installed a pickup on it as well. I've made sure that it works. The 2nd part of my lab is to complete a circuit on a breadboard that will affect the guitar output. Here's the question:
Q. Build a circuit using a MAX274 op-amp (with 24 total pins) that suppresses the second- and higher-order harmonics of the unmodified G string by at least 40 dB.
The frequency of the G string is 196 Hz. I know a low pass filter is required for this purpose but I just don't understand how to make the calculations for the individual capacitors and resistors involved, and the exact schematics of the circuit around the MAX274. I will give full karma points to anyone who can show the circuit with the relevant parts and values around the MAX274 diagram.
Explanation / Answer
First, it's easier for you to see what's happening inside the MAX274 by printing out the datasheet, or opening multiple copies of the datasheet on you computer. Page 13 gives you a step-by-step rundown of the process. Step A: R2 = (2*10^9)/f0 Step B: R4 = R2 - 5kOhms Step C: R3 = Q*(2*10^9)/f0 * (RX/RY) Step D: R1 = (2*10^9)/(f0 * Holg) * RX/RY Details on Q, Hogl, and RX/RY are found on page 14. I would suggest setting the FC pin to V-, with Q = 1 (Q=1 is the typical in the datasheet). This should do it for finding the resistors for the filter. For the power supply, refer to page 24 in your datasheet. It will give you a typical design for powering your filter. In case you don't have the datasheet, here are the links from maxim: http://datasheets.maxim-ic.com/en/ds/MAX274-MAX275.pdf http://www.maxim-ic.com/datasheet/index.mvp/id/1452
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