Expert Sleepers Beatrix

Phaser for voltage control over notch frequencies, effect depth and feedback

• 100% analog
• Frequency CV input with attenuator
• Manual controls for frequency, feedback, depth and input level
• Switches for phase and sum
• CV inputs for offset, depth and feedback

Beatrix is a phaser, offering voltage control over notch frequencies, effect depth and feedback (resonance). It also offers an unusual 'offset' control that allows scanning of filter notches without changing the resonance frequency. Additional options are provided by the 'phase' switch (which disables the phasing sound and essentially turns the module into a resonant peak filter) and the 'sum' switch (which reverses the filtered signal, giving a different phasing flavor) . If desired, Beatrix will automatically oscillate with high feedback, although the front panel control is set at the factory to stop just before self-oscillation. The module is 100% analog, using discrete transistor OTAs.

Technical Specifications.

• Panel width: 8HP
• Module depth: 37mm
• Current draw: 22mA on the +12V rail, 21mA on the -12V rail
• Inputs:
  • Frequency (approximately 1V/octave, with attenuator)
  • Offset
  • Depth
  • Feedback
  • Audio input (with attenuator)
• Outputs:
  • Audio output