Electro-Harmonix Small Stone Phaser Guitar Effect

This is the schematic diagram of the Electro-Harmonix Small Stone Phaser guitar effect pedal. The Small Stone is notable for using Operational Transconductance Amplifiers (OTAs) for phase shift stages instead of traditional operational amplifiers.

The Electro-Harmonix Small Stone Phaser is a renowned guitar effect pedal designed to create a rich, swirling phase shift effect, which is achieved through the innovative use of Operational Transconductance Amplifiers (OTAs). The schematic diagram illustrates the key components and their interconnections, highlighting the unique design that sets the Small Stone apart from other phaser pedals.

In the circuit, the OTAs serve as the core element for the phase shifting mechanism. Unlike conventional designs that typically employ standard operational amplifiers, the use of OTAs allows for a more nuanced control of the phase shift, enabling a broader range of tonal options. The circuit includes a feedback loop that manipulates the phase relationship between the input and output signals, resulting in the characteristic swirling sound.

The schematic also incorporates passive components such as resistors and capacitors that define the cutoff frequency and resonance of the phasing effect. These components work in conjunction with the OTAs to shape the audio signal, allowing for adjustments in depth and rate of modulation. The presence of potentiometers in the circuit provides user control over these parameters, enhancing the pedal's versatility.

Power supply considerations are also depicted in the schematic, indicating the voltage requirements and grounding methods necessary for optimal performance. Proper power management is crucial for maintaining signal integrity and minimizing noise, which is especially important in effects pedals used in live performance settings.

Overall, the Electro-Harmonix Small Stone Phaser schematic diagram exemplifies a sophisticated approach to phase shifting in guitar effects, showcasing the advantages of using OTAs to achieve a distinctive sound that has made this pedal a favorite among musicians.This is the schematic diagram of Electro-Harmonix Small Stone Phaser guitar effect pedal. The Small Stone is somewhat special in applying Operational Transconductance Amplifiers (OTA s) for phase shift stages rather of opamps with variabl.. 🔗 External reference