Buchla 297 Infinite Phase Shifter

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Manufacturer Description:

The Model 297 Infinite Phase Shifter displaces the phase of an applied
signal by up to 1800 degrees, depending on frequency and number of
stages selected. The phase shifted signal may be combined with the
original to create a moderately warped comb filter with complimentary
outputs. Notch density and depth can be varied through feedback
(resonance) and stage selection. A wide range sweep oscillator enables
the familiar cyclical phase shift effect.



All parameters (phase shift, notch depth, sweep rate, sweep depth,
resonance) are voltage controlled, with processing control inputs where
appropriate. A built-in envelope follower facilitates the creation of
amplitude-dependent effects.



The 297 is capable of "barber pole" phasing, with the phase shift (and
the consequent filter peaks and notches) continuously moving in one
direction. Unique circuitry provides (or consumes) the extra time
involved in this process. The rate of change can be varied up to 2.5
octaves per second in either direction and is voltage controllable.



Note that the 297 is not amongst the e series and its settings cannot be internally stored.