Randy's Revenge Ring Modulator User Manual

Introduction

The Fairfield Circuitry Randy's Revenge is an all-analog ring modulator pedal designed for guitar and other instruments. It features a pure sine wave oscillator and a low-pass filter, offering a wide range of sonic possibilities from subtle tremolo and vibe effects to thick bells, tuned intervals, and synth-like textures. Its expanded control voltage (CV) capabilities allow for advanced integration with other CV-capable devices.

Product Overview

Figure 1: Top view of the Randy's Revenge Ring Modulator, displaying the main control knobs (Volume, Mix, Freq, LPF) and toggle switches (SQ/SI, HI/LO), along with the footswitch and an LED indicator.

Figure 2: Rear view of the Randy's Revenge Ring Modulator, illustrating the power input (9V) and audio connections (IN, OUT, CV).

Setup

1. Power Connection: Connect a standard 9V DC power supply (center negative) to the 9V input jack on the rear of the pedal. The pedal requires 9 Volts and approximately 200 Milliamps.
2. Audio Input: Connect your instrument (e.g., guitar) to the "IN" jack using a standard 1/4-inch instrument cable.
3. Audio Output: Connect the "OUT" jack to your amplifier or the next pedal in your signal chain using a standard 1/4-inch instrument cable.
4. CV Connection (Optional): For advanced control, connect compatible control voltage devices to the "CV" jack. The stereo CV port can be switch-programmed for an expression pedal or as a 2-channel CV port.

Operating Instructions

Controls:

• VOLUME: Adjusts the overall output level of the pedal. Can also add a subtle signal boost and dirt to the signal when increased.
• MIX: Controls the blend between the dry (unaffected) signal and the wet (ring modulated) signal. Turn clockwise for more modulated effect.
• FREQ: Adjusts the frequency of the internal sine wave oscillator. Lower frequencies create tremolo/vibe effects, while higher frequencies produce bell-like tones, tuned intervals, and synth sounds. This control is voltage-controllable via the CV input.
• LPF (Low-Pass Filter): Controls the cutoff frequency of the low-pass filter. Experimenting with this knob allows for shaping the tone from strange to subtle. This control is also voltage-controllable via the CV input.
• SQ/SI Switch: Toggles between Square wave and Sine wave modulation. The internal oscillator is pure sine wave.
• HI/LO Switch: Selects the frequency range for the oscillator. "LO" provides lower frequencies suitable for tremolo and vibe effects, while "HI" accesses higher frequencies for ring modulation and synth-like sounds.
• Footswitch: Engages or bypasses the effect. The LED indicator illuminates when the effect is active.

Basic Operation:

1. Ensure the pedal is properly connected to power and your audio chain.
2. Press the footswitch to activate the effect (LED will light up).
3. Start with the MIX knob at 12 o'clock, VOLUME to taste, and FREQ/LPF at a moderate setting.
4. Experiment with the FREQ knob to explore different modulation speeds (LO range) or harmonic content (HI range).
5. Adjust the LPF knob to filter the modulated sound, making it brighter or darker.
6. Use the MIX knob to blend the desired amount of the ring modulated signal with your dry signal.

Advanced CV Capabilities:

The Randy's Revenge offers extensive CV integration. Both the oscillator frequency (FREQ) and the low-pass filter frequency (LPF) are voltage-controllable. The internal oscillator can also be used as a stand-alone voltage-controlled oscillator (VCO) via an output, allowing Randy's Revenge to control or be controlled by other CV-capable devices.

Maintenance

• Cleaning: Use a soft, dry cloth to clean the pedal's exterior. Avoid abrasive cleaners or solvents.
• Storage: Store the pedal in a cool, dry place away from direct sunlight and extreme temperatures.
• Power: Always use the specified 9V DC (center negative) power supply. Incorrect power can damage the unit.
• Connections: Ensure all cables are securely connected to prevent signal loss or intermittent operation.

Troubleshooting

Specifications

• Model: Randy's Revenge
• Brand: Fairfield Circuitry
• Power: 9V DC (center negative)
• Current Draw: Approximately 200 Milliamps
• Input Impedance: 1 MΩ
• Dimensions: Approximately 6.97 x 5.51 x 3.5 inches
• Weight: Approximately 1.08 pounds
• Signal Format: Analog
• Color: Gray, Black

Warranty and Support

For warranty information and technical support, please contact Fairfield Circuitry directly through their official website or authorized dealers. Keep your proof of purchase for any warranty claims.

Note: Unauthorized modifications or improper use may void the product warranty.