Reference Tables , Useful Info
Get flash to fully experience Pearltrees
The DIY500 mkII PCB can accept any op amp which conforms to the same physical package and electrical pinout as popularized by the API™ 2520 , and operates on bipolar (+/-) 15 or 16VDC power supplies.
Compatible Operational Amplifiers - Eisen Audio, LLC
Pro Audio Reference
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My (acoustic) guitar has a noticeable boom in a particular bass frequency, and i became frustrated tryin to remedy it by trial and error with the parametric eq. Then i found this chart of frequencies that helped me find and fix it quick. Thought i'd share it in hopes someone else can get some use: * 82.4 E - open 6th string * 87.3 F * 92.5 F# * 98.0 G * 103.8 G# * 110.0 A - open 5th string * 116.5 A# * 123.5 B * 130.8 C * 138.6 C# * 146.8 D - open 4th string * 155.6 D# * 164.8 E * 174.6 F * 185.0 F# * 196.0 G - open 3rd string * 207.6 G# * 220.0 A * 233.1 A# * 246.9 B - open 2nd string * 261.6 C - "middle C" * 277.2 C# * 293.6 D * 311.1 D# * 329.6 E - open 1st string * 349.2 F * 370.0 F# * 392.0 G * 415.3 G# * 440.0 A - 5th fret on 1st string * 466.1 A# * 493.8 B * 523.2 C * 554.3 C# * 587.3 D * 622.2 D# * 659.2 E - 12th fret on 1st string
Guitar notes and frequencies, chart included