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CS-8 Series PHS-28 Rev1.01, Dec. 2013
Fig. 3 shows the flow chart of all audio signals of PHS-28. All elements of
controls and their regarding jacks were omitted for better clarity. The
principles of their operation will be explained as follows.
Input A
Input B
Input: The audio inputs are signed with
and
, these are pure AC
Input A
Input B
inputs. The controller
(1) and
(2) are tied capacitively
decoupled to their input jacks of the same name. The controller attenuate the
incoming audio between 0 and 1.
Mix A
Mix B
Mix A, Mix B: The outputs
and
are audio outputs, they provide,
Mix A (7)
Mix B
dependently on the position of the regarding controllers
and
(8)
Input A
B
, resp. the balance between the original audio input
and
, resp. and
the regarding effect output of channel A and B, resp.. The output level at these
jacks is reduced by -2.5 dB (75%). This avoids internal overloads in certain
routings and resonance settings.
St-8 A
St-8 B
St-8 A, St-8 B: The outputs
und
are audio outputs, they provide
the clean effect signal of the regarding channel at their 8th stage. The output
level at these jacks is also reduced by -2.5 dB (75%) in the same way as above.
Freq: The influencing variables on this parameter will change the phase
frequency. That is the frequency where the phase shift is exactly the half of the
Freq
total possible phase angle (see below). The controller
(3) affects both
channels and provides a range from 1 Hz to 200 kHz. This is necessary to
achieve with 16 stages in the feedback loop with the undermost notch
frequency 20 kHz or with the topmost one 20 Hz, respectively (see below). The
Det (4)
controller
(detune) affects only the phase frequency of channel B and
achieves a detuning of ±3.6 octaves (x12 resp. ÷12). The regarding control
CV A, -CV A
CV
inputs for the phase frequencies are the jacks
for channel A and
B, -CV B
for the channel B with a sensitivity of ±3 octaves/Volt or a scale of
±330 mV/Oct, respectively.
A bit yummy theory: The following two pages shows 16 graphs (Fig. 4). They
illustrate the amplitude- and phase responses of a phaser chain at the stages 2,
4, 6, 8, 10, 12, 14 and 16.
-13-
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