![]() The 47K (R5) resistor and 1M (R6) potentiometer connected between the non-inverting input and the output adjust the gain of the signal. By adjusting the values of R4 and C4, you can change the cutoff threshold. This filter only allows frequencies over a particular threshold to pass and get boosted. The 4.7K (R4) and 22uF (C4) connected to the op amp's inverting input create a high pass filter. The Op Amp stage is configured as a variable gain non-inverting high pass amplifier. Frankly I am not 100% certain what it is doing, but I am certain that it needs a resistor there (as the circuit was unhappy when I removed it). I found that the value of this resistor is not remarkably important to the sound (as far as I can tell). The center of the voltage divider then passes through a 100K (R3) resistor on it's way to non-inverting input. The 100uF (C1) and 0.1uF (C3) capacitors in parallel with this voltage divider are simply voltage filters intended to smooth out the power supply voltages. To explain the presence of this requires more information about op amps than I want to provide at this juncture, but trust me that it is fairly standard. Put another way, the 10K resistors (R1 and R2) form a simple voltage divider and create a virtual ground at the center connection of the voltage divider. Also connected to the non-inverting input of the op amp is a virtual split rail supply. The audio then passes to the non-inverting input of the op amp. Assuming that the circuit is not bypassed, the signal then passes through a 0.01uF (C2) capacitor which functions as a standard input buffer. This means the clean audio signal will bypass the circuit altogether when the switch is toggled. ![]() ![]() The signal from the input then goes to a DPDT switch which serves as a true bypass switch. To learn more about that, check out my DIY Guitar Pedal instructable. The input to the circuit has a stereo jack which acts as a switch to toggle on and off the power. In my version, I took elements of all three pedals and created something relatively new-ish. This circuit is based on Gus Smalley's Simple Octave Up pedal and Scott Swartz's Octave Screamer, which in turn is based in-part on the classic Tube Screamer pedal. I also have some extras lying about if you want to buy one. Note: The files that you need to make your own PCB are attached below. Give one of our octave pedals a whirl to discover new possibilities of playing on your search for tonal nirvana.The complete list of materials is as follows: Music Toyz has had one goal in mind since opening our doors in 1998, and that is to inspire musicians to play music. No matter what your reason for adding an octave pedal to your setup would be, at Music Toyz we have you covered with great options such as the Earthquaker Devices Hoof Reaper Octave Fuzz and Chicago Iron Octavian Special Edition Octave Pedal alongside killer octave pedals from Digitech and Zvex Pedals. These octave pedals are great for single note leads, and you’ll find contemporary musicians such as Jack White implementing octave pedals into their rigs. However, because octave pedals can be used to create fuzzy overtones, some pedal makers have begun incorporating fuzz pedal circuitry to push the audio signal even further into the red. ![]() Octave pedals work by shifting the octave of played notes, most frequently by moving one octave up or down. While octave pedals are not as common of an effects pedal to find on a pedalboard as distortion or overdrive pedals, their presence in recorded music has grown ever since the use of an octave pedal was popularized by the playing of legendary guitarist Jimi Hendrix.
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