Vibrato Project

The Vibrato Effect

Vibrato is commonly known as a technique musicians and singers use to slightly alter the pitch of a note creating a wavy effect. This technique is usually achieved on stringed instruments by wiggling the strings of a ringing note. This effect can also be created by modifying the input signal through a process called pitch modulation. The effect pedal created in this project will be able to produce the vibrato effect with controls to modify the depth and rate of the effect.

Circuit Diagram

The schematic shown here is the circuit that will be created in this project. It is a relatively simple vibrato circuit, using potentiometers, resistors, capacitors, and various transistors. The transistors used are the BC547 and 2N2222, which are BJT's, or Bipolar Junction Transistors. Specifically of the NPN type, meaning they consist of a p-type material between two n-type materials. The other transistor is a JFET, or Junction Field Effect Transistor. The potentiometers control the depth and speed of the effect which will be explained later in this project.

Eagle Circuit Diagram

The circuit diagram shown here is a recreation of the circuit using EAGLE Autodesk. The circuit is essentially an oscillator, specifically an LFO or Low Frequency Oscillator, and an input/filter stage. The depth controls changes the amplitude of the oscillator signal, where the speed control changes the frequency of the oscillator signal.

PCB Board

This is the PCB created from the schematic in EAGLE. The connections are all appropriately routed and the board is ready to be milled.

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