ThorpyFX Pulse Doppler – Phaser, Vibrato & Tremolo


The Pulse Doppler is a twin-notch phaser, vibrato and tremolo pedal that enables you to sound like as many of the classic records that use the phasing effect as possible.

Requires quality 9V DC centre negative supply

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ThorpyFX Pulse Doppler

The ThorpyFx Pulse Doppler receives its name because it simulates the Doppler effect. This accelerates and retard the pitch of your input signal.

It then blends that signal back (or not) with the straight input signal to produce an array of time-based modulation effects.

You might think that this is a Doppelganger for a previous classic, yet it’s somehow sound.

The ThorpyFX Pulse Doppler is the last word” in analogue Phase Shifter effects pedals.

ThorpyFx and Dan Coggins (former Logy and Dinosaural designer) wanted to deliver a decade-spanning twin-notch phaser pedal. Also, they wanted one that enables you to sound like as many of the classic records that use the phasing effect as possible.

However, they decided to take it much further and create a dream phaser pedal, whilst retaining simplicity of use.



  • Manual Phase Shift
  • Dual
  • Invert
  • Blend
  • Rate


This control adds resonance but stops short of oscillation.

When zeroed, there is no regenerative feedback around the four-stage phase shifter (twin notch filter) path.

When advanced in a clockwise direction up towards the extreme, phase-shifted only output signal is fed back to the phase shifting notch filter path input. This increases the depth of the two frequency notches.


This sets the default notch filter frequencies. At their lowest frequencies at the anticlockwise end and gives higher frequency notches when advanced clockwise.

When the depth control is at zero, the Manual control dominates the set notch frequencies which may be swept by hand, accordingly.

Depending upon the settings of the toggle switches and the other controls, this may be more or less ‘fussy’ in its operating window.

If the sounds seem to disappear, then this MANUAL control is the one to use. Intuitively `relocate’ the sound and bring it into the ‘sweet spot’.

The two large red LEDs indicate the action of each notch filters modulation sweep. They provide a ready visual reference and roadmap as to what’s going on regarding the modulation inside the pedal.


This toggle switch allows an inversion of the notches being modulated. Instead of being simultaneous and tandem “in sync” with the ‘Dual’ setting, they move in opposition to one another.

The resulting sound of each mode is distinctly different when compared and each offer different musical possibilities.


This three-position toggle switch offers three distinct sounds.

  • ‘NORMAL’ is the conventional, basic “additive” approach. The straight and phase shifted signals combine and achieve a full ‘reinforced’ swept sound.
  • The ‘INVERT’ setting inverts the phase shifted signal. The sounds subtract and have a hollower and somewhat different harmonic content. Please note this will be most noticeable when using the Blend control somewhat below maximum.
  • The ‘PULSE’ setting alters the phase-shifted signal. Low frequencies ae lost and acts as a modulated high-pass filter. This can result in disappearing, stuttering and tremolo effects.

Because this setting gives less signal, it can appear to be subjectively quieter.


This control sets the balance of dry/straight buffered input signal (fully CCW) to delay-only/wet (fully CW) with all ratios in between available over its rotation.

In the centre, the mix of dry to wet signal is approximately 1:1 which produces the deepest ‘notch’.

Fully clockwise will give increasing vibrato/pitch modulation and or pulsing effects, dependent upon the toggle switch settings.

The anticlockwise end will allow for more subtle phasing effects with a less pronounced notch depth.


This control introduces the LFO waveform to the phase shift MANUAL control until it dominates it (almost completely) when set fully clockwise.

It can and should be used in conjunction with the MANUAL control which skews (and fine-tunes) the range of LFO sweep applied to it over most of its area, but less so as the DEPTH is advanced.


This control goes from very slow (fully CCW) to very fast (FULLY CW) and everything in between. It determines the free-running LFO frequency which is applied to the manual phase shift with its amplitude fed proportionally from zero to maximum sweep via the DEPTH control setting.


The Left-Hand Footswitch connects the straight signal to the output mix, giving a choice of Phase / Vibrato), or Pulse-only.

The two output sockets allow for “Wet and Dry” signal path connectivity when the effect is engaged. Both produce a straight bypass signal when the effect is bypassed. The Right-Hand footswitch turns the ThorpyFX Pulse Dopper on/off (i.e., `Bypass’).

Additional information

Weight 0.75 kg
Dimensions 12.5 × 10 × 5.3 cm
Analogue or Digital



Black, Red


50 mA



Pedal Type

Phaser, Tremelo

Power Connection Type

Centre Negative

Silicon or Germanium





Pulse Doppler


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