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Signal Output
(To Amplifier)
Use these instructions to learn:
How to build an effects pedal for fuzz with non-selective frequency tripler.
The Contortionist II kit is an all analog, high octane fuzz box. It produces fuzz with layered octave
overtones similar to those produced by an electronic-bow. The frequency multiplier circuitry creates
harmonics that swell and recede depending on gain setting, pick attack, neck position and pickup. This is a
high gain circuit that can put out up to 2 volts and will provide ample amounts of sustain.
Added features to the original contortionist circuit include a tone control and LED.
Warning: This circuit was designed for use with a 9 VDC power supply only.
THE CONTORTIONIST II (K-965)
1
9 VDC
CENTER (-)
ADAPTER
Signal Input
(From Guitar)
Unplug when not in use
to save battery life.
Copyright © 2020 by modelectronics.com
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Summary of Contents for Mod THE CONTORTIONIST II
- Page 1 How to build an effects pedal for fuzz with non-selective frequency tripler. The Contortionist II kit is an all analog, high octane fuzz box. It produces fuzz with layered octave overtones similar to those produced by an electronic-bow. The frequency multiplier circuitry creates harmonics that swell and recede depending on gain setting, pick attack, neck position and pickup.
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Page 2: Table Of Contents
TABLE OF CONTENTS TOOL LIST p. 2 PARTS LIST DRAWINGS pp. 3, 4 FINAL ASSEMBLY REFERENCE DRAWING p. 5 SOLDERING TIPS p. 6 STEP BY STEP ASSEMBLY INSTRUCTIONS pp. 7 - 11 Section 1 - Mount Large Components p. 7 Section 2 - Wire Large Components p. -
Page 3: Parts List Drawings
PARTS LIST 1 Stranded Wire (22 AWG) - Blue 3PDT Foot Switch K-PUL1569-BLUE (4 FT) P-H501 Enclosure P-H1590BBCE-W Potentiometers (24 mm diameter) R-VA1KL R-VA250KA Mini Potentiometer (16 mm diameter) Knobs R-VAM100KA-SS P-K680-BLU P-K680-WHT P-K680-RED Terminal Strip with 8 Terminals P-0802H Battery Clip Terminal Strip with 3 Terminals S-H155... - Page 4 PARTS LIST 2 NPN Darlington (MPSA13) 180 Ω Resistor ½ W P-QMPSA13 R-A180 brown grey brown E B C gold NPN BJT (2N3904TAR) K-P2N3904TAR 1.5kΩ Resistor ½ W 3904 R-A1D5K 1.5K brown E B C green PNP BJT (2N3906) gold K-PQ-2N3906 10kΩ...
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Page 5: Final Assembly Reference Drawing
FINAL ASSEMBLY REFERENCE DRAWING This is a large version of the final assembly drawing. Refer to this drawing as you make your way through each step of the instructions. Before you make a new connection at a particular terminal or solder lug, notice how many other connections will be made at that terminal. That way you can decide whether it’s best for you to solder the connection and leave space open for future connections or hold off on soldering until after every connection at that location has been made. -
Page 6: Soldering Tips
SOLDERING TIPS It is important to make a good solder joint at each connection point. A cold solder joint is a connection that may look connected but is actually disconnected or intermittently connected. (A cold solder joint can keep your project from working.) Follow these tips to make a good solder joint. -
Page 7: Step By Step Assembly Instructions
SECTION 1 – Mount Large Components Please refer to DRAWING 1 and DRAWING 2. The Anode (+) side of the LED is Orient the enclosure with the two 5/16" holes and one 9/32" hole on top. indicated by a slightly longer lead and/or a positive sign. -
Page 8: Section 3 - Mount Components To Terminal Strips
Please note that each terminal has been numbered as illustrated here and will be referred to as a “terminal #_” when connecting different components and wires throughout the assembly instructions. Strip and tin a 2" piece of wire and connect footswitch lug 8 to the output jack's tip lug. - Page 9 Connect the 0.1µF cap to terminals #2 and #4. This should be mounted upside down to allow room for other components to be mounted later in the instructions. There will be two more components connected to terminal #4 so do not solder at #4, yet. Connect the 3M resistor to terminals #4 and #5.
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Page 10: Section 4 - Finishing Up
Locate the battery snap connector. Connect its red wire to the power jack's "positive switch" lug and connect its black wire to the input jack's ring lug POSITIVE-SWITCH LUG SECTION 4 – Finishing Up It’s always a good idea to thoroughly double-check your connections before applying power. This will minimize the risk of damaging components. -
Page 11: Assembly Drawings (4 Drawings)
DRAWING 1 9/32" 5/16" 5/16" 1/4" 1/8" INSIDE VIEW OF THE 1/8" 1/8" ENCLOSURE 15/32" 1/8" 1/8" 15/32" 3/8" 3/8" DRAWING 2 100KA 250KA... - Page 12 DRAWING 3 TONE 100KA FUZZ VOLUME 250KA RING SLEEVE SLEEVE DRAWING 4 TONE 100KA FUZZ VOLUME 250KA 22µF 50V 1.5K .0039µ 331K 3906 820K .1µ RING SLEEVE SLEEVE...
- Page 13 The Contortionist II Troubleshooting Supplement After thoroughly double-checking your connections, the next step is TONE 100KA to take DC voltage measurements to help locate problem areas. FUZZ VOLUME 250KA Using a volt meter, connect the ground side lead of the meter to any ground point on the pedal.
- Page 14 4.6 VDC 0.2 VAC 3.9 VDC 0.8 VDC GAIN 22µ P-H501 MPSA13 3PDT 2N3904 2N3906 NPN Darlington Transistor Footswitch NPN BJT PNP BJT Collector Collector MPSA13 Base Base Emitter Emitter www.modkitsdiy.com Copyright © 2015 by modkitsdiy.com “The Contortionist II” (K-965) Schematic...
- Page 15 APPLYING THE STICKER TO MOD PEDAL ENCLOSURES Peel the backing from the sticker. Carefully line up the top edge of the sticker with the top of the pedal. Press down to apply the sticker only to the edge. Run a finger across the edge to push any air Locate the top of the pedal as well as out from beneath the sticker.
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