Summary of Contents for Mu-Tron Pedal Flanger 3007
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Page 1: Cover Sheet
PEDAL FLANGER (MUTRON) Build Documents Pedal Flanger 3007 Stop Rate Feedback Start Effect Pedal... -
Page 2: Table Of Contents
PEDAL FLANGER (MUTRON) Contents Page Cover Sheet………………………………………..1 Contents…………………………………………….2-3 Introduction………………………………………4 Pedal Flanger Full Schematic………………5 Main Board Schematic…………………………6 LED/LDR Board Schematic………………….7 Main Board Overlay…………………………….8 LED/LDR Board Overlay……………………..9 Main Board PCB………………………………….10 LED/LDR Board PCB…………………………..11 Main Board BOM Quantities…………………12 Main Board BOM Designations………..13-15 LED/LDR Board BOM Quantities………….16 LED/LDR Board BOM Designations………17 Offboard Wiring…………………………………18... -
Page 3: Contents
PEDAL FLANGER (MUTRON) Contents Assembly Instructions………………………20-21 Drilling Template Notes / X Wing………22 Drilling Template……………………………..23 LED/LDR Board Fabrication………………24 LED/LDR Board LED Indicator Inst.…..25 Shutter Modification………………………… Test Point Fabrication……………………….27 DC Jack Spacer………………………………….28 Rate Indicator Installation………………...29 Calibration Procedures………………………30-32 Test Pint & Trimmer Legend……………….33 Pedal Flanger Artwork………………………34... -
Page 4: Introduction
PEDAL FLANGER (MUTRON) Introduction It doesn’t seem that long ago, as a teenager in the seventies, I took in a vast array of music both past and present. Contained in this music were passages where the guitar was transformed into something seemingly magical. As I entered the world of music as a vocalist, I soon discovered what some of these devices were and how they produced these “magical”... -
Page 8: Main Board Overlay
PEDAL FLANGER (MUTRON) Main Board Overlay... -
Page 9: Led/Ldr Board Overlay
PEDAL FLANGER (MUTRON) LED/LDR Board Overlay Note: D14 & D15 are installed on trace side in outer holes on board "outriggers" See "LED/LDR Board indicator LED installation" for instructions. -
Page 10: Main Board Pcb
5.32 in (134.5mm) -
Page 11: Led/Ldr Board Pcb
111.6mm... -
Page 12: Main Board Bom Quantities
PEDAL FLANGER (MUTRON) BOM - Quantities 1 - 91K Ceramic 2 - 10pf 3 - 100K 1 - 120pf 1 - 110K 1 - 560pf 3 - 120K 1 - 680pf 1 - 200K 1 - 820pf 1 - 220K 2 - .1µf (multilayer ceramic) 1 - 270K 5 - 390K... -
Page 13: Main Board Bom Designations
PEDAL FLANGER (MUTRON) BOM - Designations Part Value C48- 47µf C1- .047µf C49- 4.7µf tant. C2- 10pf C50- 1000µf C3- .047µf C57- 1.5µf tant. *(1) C4- .01µf CX1- 1µf C5- .001µf CX2- .1µf multilayer ceramic C6- .047µf CX3- .1µf multilayer ceramic C7- 4.7µf CX4- 10µf... - Page 14 PEDAL FLANGER (MUTRON) BOM - Designations R1- 4.7K R52- 39K R2- 390K R53- 39K R3- 390K R54- 39K R4- 2.7K R55- 39K R5- 10K R56- 750Ω R6- 6.8K R57- 10K R7- 180Ω R58- 1.5M R8- 390K R59- 47K R9- 390K R60- 220K R10- 2.2K...
- Page 15 PEDAL FLANGER (MUTRON) BOM - Designations J1- MONO JACK NMJ4HCD2 J2- MONO JACK NMJ4HCD2 J3- DC POWER JACK 2.1MM PCB MOUNT SW1- 3PDT FOOTSWITCH SW2- DPDT FOOTSWITCH CON-A – WAFER CONNECTOR 2.54MM RIGHT ANGLE CON-B – WAFER CONNECTOR 2.54MM RIGHT ANGLE CON-C –...
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Page 16: Led/Ldr Board Bom Quantities
PEDAL FLANGER (MUTRON) LED/LDR BOARD BOM QUANTITIES Film Box 1 - .0047µf Resistors ¼ watt 2 - 1.5K 2 - 3.3K 1 - 24K 1 - 56K 1 - 220K 1 - 390K 1 - 1M Resistors ½ watt 1 - 330Ω... -
Page 17: Led/Ldr Board Bom Designations
PEDAL FLANGER (MUTRON) LED/LDR BOARD BOM DESIGNATIONS Part Value C51 .0047µf D14 LED 5MM (your choice of color) D15 LED 5MM (your choice of color) D18 Yellow 3MM diffused IC10 RC4558P LDR1 Waitrony KE-10720 LDR LDR2 Waitrony KE-10720 LDR Q3 2SC828 R42 1.5K R49 1.5K... -
Page 18: Offboard Wiring
PEDAL FLANGER (MUTRON) OFF BOARD WIRING LEGEND... -
Page 19: Offboard Wiring Connectors
PEDAL FLANGER (MUTRON) Offboard Wiring Connectors Con A-1 SW2 lug1 Con G-1 Con J pin2 Con A-2 N/C Con G-2 Con J pin3 Con B-1 SW2 lug6 Con H-1 shield Con B-2 SW1 lug6 Con H-2 SW1 lug7 Con C-1 SW1 lug2 Con I-1 SW1 lug1 Con C-2 shield... -
Page 20: Assembly Instructions
PEDAL FLANGER (MUTRON) Assembly Instructions Disassembly of Morley enclosure It is necessary to remove the pedal assembly from the enclosure to drill new holes. Remove the bottom cover. Remove the input and output jack nuts. Remove the four hex nuts holding the original volume circuit board in place. - Page 21 PEDAL FLANGER (MUTRON) Assembly Instructions Installation of main board Install populated main board in enclosure. Check for proper component alignment with holes. Remove main board. Install “rate” indicator LED as outlined in “rate indicator LED installation”. Remove main board. Connect finished female connectors to matching male connectors on both PC boards.
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Page 22: Drilling Template Notes / X Wing
PEDAL FLANGER (MUTRON) Drilling Template/X Wing Switch For best results, print the drilling template using a heavier “card type” stock. For the prototype, I used a file folder that I trimmed down to letter sized stock (8.5 X 11) Align the template with the inside lower wall of the enclosure. - Page 23 WHEN PRINTING CUT ALONG OUTSIDE TEMPLATE, MAKE PERIMETER OF BLACK SURE YOUR PRINTER’S BORDER SCALING IS SET TO “NONE” OR 100% ALIGN TEMPLATE WITH INSERT DRILLING SIDES AND BOTTOM TEMPLATE IN BOTTOM OF ENCLOSURE OF MORLEY ENCLOSURE WITH PRINT FACING YOU RATE LED 5MM RATE...
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Page 24: Led/Ldr Board Fabrication
PEDAL FLANGER (MUTRON) LED/LDR Board Fabrication The LED/LDR board design, with its cut out slots for the LEDs, LDR, pedal shutter, and “outrigger” mounted indicator LEDs, is based on the Morley Optical Volume pedal PC board. To fabricate this board, first drill multiple holes inside the slot borders. Using small files, an X-acto knife, and emery cloth, shape the slots to the dimension lines. -
Page 25: Led/Ldr Board Led Indicator Inst
PEDAL FLANGER (MUTRON) LED/LDR Board LED Indicator Installation Insert the Effect In/Out (D14) and the Pedal indicator (D15) LEDs through the outermost holes on the “outriggers” trace side. (Flat side, cathode facing down) On the component side, bend the led leads toward the inside of the board. -
Page 26: Shutter Modification
PEDAL FLANGER (MUTRON) Pedal Shutter Modification WHEN PRINTING TEMPLATE, MAKE SURE YOUR PRINTER’S SCALING IS SET TO “NONE” OR 100% 1.4" (35.56mm) 1.254" (31.86mm) Original Shutter Modified Shutter (Template) Remove shutter from Morley enclosure. Place shutter on flat surface. Use Xacto knife to extend slot (handle) of pot shaped figure. Slot should be extended .413"... -
Page 27: Test Point Fabrication
PEDAL FLANGER (MUTRON) Test Point Fabrication The Pedal Flanger PCB layouts include six test point pads for calibration purposes. (TP1-TP6) The test point are located on the trace side and can be accessed by removing the bottom cover. Due to the limited clearance between the flanger PC board and the bottom cover, standard, commercially available test points cannot be used. -
Page 28: Dc Jack Spacer
PEDAL FLANGER (MUTRON) DC Jack Spacer Fabrication & Installation Due to the Morley enclosure’s presence of “predrilled” holes, it is necessary to fabricate a shim/spacer to properly center the board mounted DC jack. The spacers can be fashioned from two pieces of etched circuit board scrap. Drill holes and file slots to accommodate the jack pins in two pieces of circuit board. -
Page 29: Rate Indicator Installation
PEDAL FLANGER (MUTRON) Rate indicator installation Install rate indicator LED after the populated main board has been installed and checked for proper alignment. Remove main board and insert the rate LED, flat side (cathode) down onto the component side. Bend the LED leads slightly to keep the LED in place. Install the main board into the enclosure. Tighten the jack and control nuts. Adjust the rate LEDs height to match the Effect In/Out and the Pedal indicator LEDs height from the top side of the enclosure. Flip the enclosure upside down and solder the Rate LED in place. Note: When building the prototype, I fashioned light inhibitors out of black writing pen tube to surround all three indicator LEDs inside of the enclosure. When the prototype’s LEDs are engaged, no light from the indicator LEDs is visible inside the enclosure. Light from the LEDs could reflect off of components and/or be cast as ambient light disturbing the workings of the pedal C.V. circuit. To fabricate the light inhibitors, cut three pieces of pen tube, 1 @ .798” (20.28mm) for the rate LED, and two @ .202” (5.13mm) for the Effect In/Out and Pedal LEDs. Ream out one end of the pen tube with a step bit or a proper sized drill bit so that the back of the LED fits inside of the tube forming a stop. The pen I used is a Papermate model # PAP3331131 or PAP3381131. ... -
Page 30: Calibration Procedures
PEDAL FLANGER (MUTRON) CALIBRATION PROCEDURES CLOCK 1. Set RATE, FEEDBACK, START controls fully CCW. STOP control fully CW. 2. Connect frequency counter to TP1 (clock test point). 3. Adjust TR5 for a frequency of *50KHz. 4. Set RATE, FEEDBACK, STOP controls fully CCW. START control fully CW. 5. Adjust TR6 for approximately 700KHz ~ 800KHz. 6. Engage effect switch. (SW1) 7. Check frequency sweep from 50KHz to approximately 700KHz ~ 800KHz. BIAS 1. Set RATE, FEEDBACK, START, STOP controls fully CCW. 2. Connect 1.25V to 2.5V 400Hz sinewave to TP3 (input). 3. Connect oscilloscope to TP2. (BBD output) 4. Adjust TR1 for best, unclipped symmetrical waveform. (See fig. 1) BBD BALANCE 1. Set RATE, FEEDBACK, START, STOP controls fully CCW. 2. Connect oscilloscope to TP2. (BBD output) 3. Adjust TR2 for best balanced waveform. (See fig. 2 ‐ 3) ... - Page 31 PEDAL FLANGER (MUTRON) CALIBRATION PROCEDURES PEDAL SWEEP RANGE 1. For best results, perform this procedure away from direct light source. 2. With enclosure positioned on its side, connect voltmeter to TP6 (GND) and TP5 (Pedal CV) 3. Cover entire enclosure with dark cloth material to keep ambient light from reaching LDRs causing inaccurate readings. 4. Engage effect switch (SW1) Engage pedal switch (SW2) 5. Adjust TR7 (Coarse adjust) and TR4 (Fine adjust) to where voltage readings are approximately 11.60v (toe down) and 2.29v (heel down) 6. Due to variances in LEDs and LDRs, It may be necessary to adjust D18, LDR1, LDR2 ‐ up, down, right or left to achieve the target voltages. Fig. 1 Top image – Sine wave after adjustment. Bottom image – Sine wave displaying clipping. Fig. 2 Fig. 3 Left image – BBD outputs unbalanced. ...
- Page 32 PEDAL FLANGER (MUTRON) *The Mutron Flanger that this build was modeled after had a 120pf capacitor (C41) and a 10pf capacitor (C41A) in parallel installed. The original factory schematic depicts a single 120pf capacitor. After reviewing the 4046 data sheet and researching 4046 clocks, I came away with this understanding. The 4046’s frequency is set by three components. A timing cap across pins 6 & 7, a resistor from pin 11 to ground, and a resistor from pin 12 to ground which offsets the base operating frequency set by the other two components. Increasing the capacitance across pins 6 & 7 will decrease the frequency. During the course of calibrating the flanger prototype, I started with 120pf and 10pf in parallel. I was unable to achieve the lower range of 50KHz. I found that an additional 100pf was needed to achieve 50KHz at the lower end of the clock cycle. There are images of a Mutron flanger circuit board that show one timing cap and empty holes where C41A would be installed. This leads me to conclude that the actual capacitance for the timing cap should be chosen at the time of calibration……if needed to reach the lower target frequency of 50KHz. ...
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Page 33: Test Pint & Trimmer Legend
PEDAL FLANGER (MUTRON) TEST POINT & TRIMMER LEGEND LOWER FREQ. UPPER FREQ. BALANCE OUTPUT BIAS FINE ADJUST COARSE ADJUST... -
Page 34: Pedal Flanger Artwork
Pedal Flanger 3007 Stop Rate Start Feedback Effect Pedal...
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