REDSHIFT DELUXE PHASER 1
PROJECT NAME
REDSHIFTBASED ON
EFFECT TYPE
PROJECT SUMMARY
DOCUMENT VERSION
Blackout Effectors Whetstone Phaser
Based on the Electro-Harmonix Small Stone, this tricked-out analog phaser adds several switches and knobs to greatly expand the tonal palette.
Phaser, vibrato & ring modulator 1.0.0 (2020-06-19)
BUILD DIFFICULTYAdvanced
Actual size is 5.48” x 2.3” (main board) and 5.08” x 0.7” (bypass board).
REDSHIFT DELUXE PHASER 2
TABLE OF CONTENTS
1 Project Overview 10-11 Drill Template
2 Introduction 12 Enclosure Layout
3 Usage 13 Wiring Diagram
4-7 Parts List 14 Licensing
8 Build Notes 14 Document Revisions
9 Schematic
INTRODUCTION
The Redshift Deluxe Phaser is based on the Blackout Effectors Whetstone Phaser, originally released in 2009 and discontinued when Blackout closed their doors in 2018.
The Whetstone was based on the Electro-Harmonix Small Stone, a classic OTA phaser, but with several modifications including additional controls & switches and an output gain boost to solve the level-matching issues in the original. It also replaced the obsolete CA3094 OTA with the NE5517/LM13700, essentially a dual version of the chip with somewhat improved specifications.
The Redshift is a direct clone of the Whetstone, with the exception that the 4-position rotary control for Range has been changed to a 3-position toggle and the “Fix” mode has been omitted. In the original Whetstone, the lower half of the rotation produces audible high-pitched oscillation, and the actual swept-phase frequency changes are limited to around the last 25% of the knob’s rotation.
So while it sounds good on paper, the “Fix” mode really isn’t very usable in practice, and there are many pedals that do the manual-phase effect much better than this one. This change also allows the elimination of a large and expensive rotary switch in favor of a standard 3-position toggle switch.
In addition to the removal of the Fix setting, there is one other change from the original Whetstone, in the form of an added feature: a second set of Rate/Range controls for LFO speed, and a footswitch to go between the two presets. While it doesn’t truly “ramp” (gradually speed up or slow down) like a Leslie, it does let you have a whole other effect available with the press of a footswitch.
REDSHIFT DELUXE PHASER 3
USAGE
The Redshift has the following controls.
Potentiometers
• Rate controls the speed of the LFO. There are two different Rate knobs that each act as presets, and the footswitch toggles between them. The range of each Rate control is set by the corresponding Range toggle.
• Depth sets the ratio of phased signal that is mixed back into the clean signal.
• Feedback (also called Resonance or Regeneration in other phasers) sets how much of the phased signal is fed back into the input to amplify the phasing effect.
• Volume is the output volume of the effect, coming off of the MOSFET boost stage.
Toggle Switches
• Range toggles between normal, fast and slow rates, going from 40-second sweeps at the slowest all the way to ring modulation and octave generation at the fastest. Each Rate knob has its own corresponding Range toggle.
• Stages toggles between two and four phase-shift stages.
• Vibrato mode cancels the clean signal, which results in a pitch vibrato effect. (Note that Depth should be set at 100% while in Vibrato mode since its only purpose is to attenuate the wet signal.)
• Assymetrical mode changes the frequency capacitors in two of the phase stages for a Univibe-like asymmetrical phasing effect.
• Lowpass mode changes two of the all-pass stages into low-pass for a darker or mellower phase tone. Combined with Vibrato mode, lowpass mode produces more of a harmonic tremolo than pitch vibrato.
• Sweep toggles between “Wide” and “Shallow” sweep modes for the LFO. This also impacts the speed of the LFO, so you may need to readjust the Rate control when toggling Sweep settings.
REDSHIFT DELUXE PHASER 4
PARTS LIST
This parts list is also available in a spreadsheet format which can be imported directly into Mouser for easy parts ordering. Mouser doesn’t carry all the parts (most notably potentiometers) so the second tab lists all the non-Mouser parts as well as sources for each.
View parts list spreadsheet →
PART VALUE TYPE NOTESR1 100k Metal film resistor, 1/4W
R2 470k Metal film resistor, 1/4W
R3 10k Metal film resistor, 1/4W
R4 4k7 Metal film resistor, 1/4W
R5 4k7 Metal film resistor, 1/4W
R6 27k Metal film resistor, 1/4W
R7 27k Metal film resistor, 1/4W
R8 1k Metal film resistor, 1/4W
R9 27k Metal film resistor, 1/4W
R10 10k Metal film resistor, 1/4W
R11 27k Metal film resistor, 1/4W
R12 1k Metal film resistor, 1/4W
R13 27k Metal film resistor, 1/4W
R14 10k Metal film resistor, 1/4W
R15 27k Metal film resistor, 1/4W
R16 1k Metal film resistor, 1/4W
R17 27k Metal film resistor, 1/4W
R18 10k Metal film resistor, 1/4W
R19 27k Metal film resistor, 1/4W
R20 1k Metal film resistor, 1/4W
R21 27k Metal film resistor, 1/4W
R22 10k Metal film resistor, 1/4W
R23 27k Metal film resistor, 1/4W
R24 3k3 Metal film resistor, 1/4W
R25 4k7 Metal film resistor, 1/4W
R26 27k Metal film resistor, 1/4W
R27 22k Metal film resistor, 1/4W
R28 2M2 Metal film resistor, 1/4W
R29 2M2 Metal film resistor, 1/4W
R30 10k Metal film resistor, 1/4W
https://docs.google.com/spreadsheets/d/1ZFFDRq_SHd-ogSR3lunFUeKsHhPbk1SHvO9mdalFxKw/edit?usp=sharing
REDSHIFT DELUXE PHASER 5
PARTS LIST, CONT.PART VALUE TYPE NOTESR31 JUMPER Metal film resistor, 1/4W Sets the minimum volume. See build notes.
R32 22k Metal film resistor, 1/4W
R33 4k7 Metal film resistor, 1/4W
R34 15k Metal film resistor, 1/4W
R35 1k8 Metal film resistor, 1/4W
R36 1k Metal film resistor, 1/4W
R37 27k Metal film resistor, 1/4W
R38 27k Metal film resistor, 1/4W
R39 7k5 Metal film resistor, 1/4W
R40 1k8 Metal film resistor, 1/4W
R41 47k Metal film resistor, 1/4W
R42 100R Metal film resistor, 1/4W
R43 15k Metal film resistor, 1/4W
R44 10k Metal film resistor, 1/4W
R45 100R Metal film resistor, 1/4W
RPD 2M2 Metal film resistor, 1/4W
LEDR 4k7 Metal film resistor, 1/4W
LEDRA 4k7 Metal film resistor, 1/4W
LEDRB 2k2 Metal film resistor, 1/4W Use 2k2 for a green LED to match brightness of a red LED with 4k7.
C1 6n8 Film capacitor, 7.2 x 2.5mm
C2 100n Film capacitor, 7.2 x 2.5mm
C3 10uF Electrolytic capacitor, 5mm
C4 6n8 Film capacitor, 7.2 x 2.5mm
C5 6n8 Film capacitor, 7.2 x 2.5mm
C6 220n Film capacitor, 7.2 x 2.5mm
C7 6n8 Film capacitor, 7.2 x 2.5mm
C8 680pF MLCC capacitor, NP0/C0G
C9 6n8 Film capacitor, 7.2 x 2.5mm
C10 47n Film capacitor, 7.2 x 2.5mm
C11 47n Film capacitor, 7.2 x 2.5mm
C12 100n Film capacitor, 7.2 x 2.5mm
C13 22uF Electrolytic capacitor, 5mm
C14 100n Film capacitor, 7.2 x 2.5mm
C15 100n Film capacitor, 7.2 x 2.5mm
C16 1uF Electrolytic capacitor, 4mm
REDSHIFT DELUXE PHASER 6
PARTS LIST, CONT.PART VALUE TYPE NOTESC17 22uF Electrolytic capacitor, 5mm
C18 100uF Electrolytic capacitor, 6.3mm
C19 1uF Electrolytic capacitor, 4mm
C20 22uF Electrolytic capacitor, 5mm
C21 100uF Electrolytic capacitor, 6.3mm
C22 22uF Electrolytic capacitor, 5mm
C23 100uF Electrolytic capacitor, 6.3mm
C24 33uF Electrolytic capacitor, 5mm
C25 47uF Electrolytic capacitor, 5mm
C26 100n MLCC capacitor, X7R
Q1 2N5088 BJT transistor, NPN, TO-92
Q2 2N5087 BJT transistor, PNP, TO-92
Q3 2N7000 MOSFET, N-channel, TO-92
Q4 2N5087 BJT transistor, PNP, TO-92
Q5 2N5087 BJT transistor, PNP, TO-92
Q6 2N5088 BJT transistor, NPN, TO-92
Q7 2N5088 BJT transistor, NPN, TO-92
Z1 1N4742A Zener diode, 12V, DO-41
D1 1N5817 Schottky diode, DO-41
IC1 LM13700N Transconductance amplifier, dual, DIP16
Original uses NE5517, which is identical to the LM13700 but obsolete in through-hole format.
IC1-S DIP16 socket IC socket, DIP-16
IC2 LM13700N Transconductance amplifier, dual, DIP16
Original uses NE5517, which is identical to the LM13700 but obsolete in through-hole format.
IC2-S DIP16 socket IC socket, DIP-16
IC3 LM13700N Transconductance amplifier, dual, DIP16
Original uses NE5517, which is identical to the LM13700 but obsolete in through-hole format.
IC3-S DIP16 socket IC socket, DIP-16
TRIM 10k trimmer Trimmer, 10%, 1/4"
DEPTH 250kB 16mm right-angle PCB mount pot
FDBK. 250kB 16mm right-angle PCB mount pot
RATE_A 1MC 16mm right-angle PCB mount pot
RATE_B 1MC 16mm right-angle PCB mount pot
LEVEL 100kA 16mm right-angle PCB mount pot
VIBR. SPDT Toggle switch, SPDT on-on
SWEEP SPDT Toggle switch, SPDT on-on
REDSHIFT DELUXE PHASER 7
PARTS LIST, CONT.PART VALUE TYPE NOTESSTAGES DPDT Toggle switch, DPDT on-on
ASYM. DPDT Toggle switch, DPDT on-on
LOW P DPDT Toggle switch, DPDT on-on
RNG. A SPDT cntr off Toggle switch, SPDT on-off-on
RNG. B SPDT cntr off Toggle switch, SPDT on-off-on
LED 5mm LED, 5mm, red diffused
LED_A 5mm red LED, 5mm, red diffused
LED_B 5mm green LED, 5mm, green diffused
IN 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.
OUT 1/4" mono 1/4" phone jack, closed frame Switchcraft 111X or equivalent.
DC 2.1mm DC jack, 2.1mm panel mount Mouser 163-4302-E or equivalent.
FSW 3PDT Stomp switch, 3PDT
RSW 3PDT Stomp switch, 3PDT
ENC 1590XX Enclosure, die-cast aluminum 1790NS equivalent.
REDSHIFT DELUXE PHASER 8
BUILD NOTES
Setting the volume trimmer
For such a large circuit, you may be surprised to find out that the only thing that needs to be set up during the build process is the volume trimmer. This controls the maximum boost level of the MOSFET output stage, which is essentially a Zvex SHO with tweaked values.
Set the volume control to full, then turn the trimmer up (clockwise) until the maximum available volume is to your liking. As with the SHO, expect a bit of crackle as the trimmer is adjusted.
R31 minimum volume resistor
The output volume control on the original Whetstone has a resistor that sets the volume level when the control is at minimum. Most people expect a volume control to go all the way down to zero, so it’s recommended to jumper the R31 resistor to make this happen. However, if you want it to be exactly like the original, use a 10k resistor here.
SCHEMATIC
REDSHIFT DELUXE PHASER 9
100uF
100k
A
1MC
+9V
GND
250kB
100k
470k
6n8
250kB
2N5088
10k
1N5817
100n
VA
15k
10k
33uF
GND GND
VB
VB
VA
2N5087
VA
4k7
4k7
27k
GND
47n
LM13700NLM13700N
LM13700N
LM13700N
LM13700N
LM13700N
LM13700N
LM13700N
VA
VA
GND
GND
10uF
27k
1k
VB
27k
27k 7k5
1uF 22uF 100uF
2M2
GND
2N5088
100n
A
A
2N5088
47k
1k8
100R
22uF
PWR_GND
PWR_GND
27k
2N5087
2N5087
PWR_GND1k
1k8
100n
PWR_GND
15k
4k7
22k
PWR_GND
100R
VC
47uF
PWR_GND
VC
VC
VC
10k
6n8
27k
GND
1k
VBVB
VB
27k
6n8
220n
A
10k
GND
27k
1k
VB
VB
A
VB
6n8
680p
F
27k
10k
GND
27k
1k
VB
VB
27k
A
10k
GND
VB
6n8
47n
27k
GND
3k3
4k7
27k
GND
22k
100n
2M2
1N4742
2N7000
2M2
GND
10k
VA
10kB
GND
22uF
GND
100n
JUM
PER
GND
1MC
1uF 22uF 100uF
VC
C23
LEVE
L
12
3
RATE
_A
12
3
IN
OUT
DEPTH
12
3
R1
R2
C1
FEEDBACK
12
3
Q1
R3
D1
C26
R43
R44
C24
Q2
R4
R5
R6
C11
VIBRATO
23
1
IC1A3
45
1
2
V+
7
8
IC1B14
1312
16
15 IC1_BUF2LM13700NIC1_BUF1
V+
10
9
IC2A3
45
1
2 IC2_BUF1
V+
7
8
IC2B14
1312
16
15 IC2_BUF2
V+
10
9
IC3A3
45
1
2
116
116
C3
R7
R8
R9
R38 R39
C16 C17 C18
231
RANGE_A
RPD
Q6
C2
Q7
R41
R40
R42
C22
R37
Q4
Q5
R36
R35
C15
23
1SWEEP
R34
R33
R32
116
R45
C25R1
0
C4
R11
R12
ASYM
A2A3
A1
ASYM
B2B3
B1
R13
C5C6
R14
R15
LOWPASS
A2A3
A1
LOWPASS
B2B3
B1
R16
C7C8
R17
R18
R19
R20
R21
R22
C9
C10
R23
R24
R25
R26 R27 C12
R28
Z1
Q3
R29
R30
TRIM
12
3
C13
C14
R31
RATE
_B
12
3
C19 C20 C21
231
RANGE_B
TO RATE FOOTSWITCH
TO RATE FOOTSWITCH
STAGES
A2A3
A1
STAGES
B2B3
B1
GND
REDSHIFT DELUXE PHASER 10
DRILL TEMPLATE
Cut out the drill template on the following page, fold the edges and tape it to the enclosure. Before drilling, it’s recommended to first use a center punch for each of the holes to help guide the drill bit.
Ensure that the template is printed at 100% or “Actual Size”. You can double-check this by measuring the scale on the printed page with a ruler or calipers.
LED hole drill size assumes the use of a 5mm LED bezel, available from several parts suppliers. Adjust size accordingly if using something different, such as a 3mm bezel, a plastic bezel, or just a plain LED.
Important: Due to the high number of PCB-mounted parts, it’s crucial that the drilling be accurate, especially the row with seven toggle switches. Since the PCB uses slotted holes for the toggles, there’s not a lot of room for error.
If the toggles don’t align to the PCB, you can always drill one step larger (9/32”) to allow a little more room correct any errors. The toggle switch washer and nut will still fully cover the hole.
http://www.smallbear-electronics.mybigcommerce.com/bezel-5mm-chrome/
REDSHIFT PHASER 11
DRILL TEMPLATE
x: -2.1, y: +1.58ø9/32”
x: -1.05, y: +1.58ø9/32”
x: 0, y: +1.58ø9/32”
x: +1.05, y: +1.58ø9/32”
x: +2.1, y: +1.58ø9/32”
x: -2.1y: +0.18
ø1/4”
x: -1.05y: +0.18
ø1/4”
x: +0.425y: +0.18
ø1/4”
x: +1.05y: +0.18
ø1/4”
x: +1.675y: +0.18
ø1/4”
x: +2.3y: +0.18
ø1/4”
x: -0.2y: +0.18
ø1/4”
x: -2.1, y: -1.58ø15/32”
x: +2.1, y: -1.58ø15/32”
x: +1.325, y: -1.58ø5/16”
CEN
TER
(0,0
)
y: +0.63x: -2.1
ø5/16”y: +0.63x: -1.05
ø5/16”
ø3/8”ø1/2”
0.38
5”
0.9” 0.9”
ø3/8”
OUT DC IN
RATE A RATE B FEEDBACK DEPTH LEVEL
BYPASSRATE PRESET LED
LED
RANGE RANGE SWEEP STAGES VIBRATO ASYMMETRY LOWPASS
LED
0 1 2
CM
0 1
INCH
REDSHIFT PHASER 12
1590XX
ENCLOSURE LAYOUT
Enclosure is shown without jacks. See next page for jack layout and wiring.
REDSHIFT PHASER 13
WIRING DIAGRAM
+V INOUT GND
+VIN
GND PCBOUTPCB +V JACK GND JACK
OUTINBRANGE
RANGE
A
GND
GND COM ARATE
RATE
B
1590XX
B A
BLED
LED
A
B A COM AB
REDSHIFT DELUXE PHASER 14
LICENSE & USAGE
No direct support is offered for these projects beyond the provided documentation. It’s assumed that you have at least some experience building pedals before starting one of these. Replacements and refunds cannot be offered unless it can be shown that the circuit or documentation are in error.
All of these circuits have been tested in good faith in their base configurations. However, not all the modifications or variations have necessarily been tested. These are offered only as suggestions based on the experience and opinions of others.
Projects may be used for commercial endeavors in any quantity unless specifically noted. No attribution is necessary, though a link back is always greatly appreciated. The only usage restrictions are that (1) you cannot resell the PCB as part of a kit without prior arrangement, and (2) you cannot “goop” the circuit, scratch off the screenprint, or otherwise obfuscate the circuit to disguise its source. (In other words: you don’t have to go out of your way to advertise the fact that you use these PCBs, but please don’t go out of your way to hide it. The guitar effects industry needs more transparency, not less!)
DOCUMENT REVISIONS
1.0.0 (2020-06-19) Initial release.
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