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THE RING IN RETURN (K-903)
9 VDC
CENTER (-)
ADAPTER
TO
FROM
AMP
GUITAR
IN
OUT
Unplug when not in use
to save battery life.
Use these instructions to learn:
How to build an effects pedal for octave fuzz.
The Ring In Return is an octave-up fuzz effect that is an all-analog design that captures those late 60s
octave-up fuzz tones. Transformer-coupled germanium diodes produce sounds that range from a subtle
octave-up to thick, harmonically-rich sonic textures, and synth-like tones. Experimenting with different
pickups and tone-control settings on your guitar with The Ring In Return can also produce sitar-like sounds.
Warning: This circuit was designed for use with a 9 VDC power supply only.
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Copyright © 2021 by modelectronics.com
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Summary of Contents for Mod THE RING IN RETURN
- Page 1 How to build an effects pedal for octave fuzz. The Ring In Return is an octave-up fuzz effect that is an all-analog design that captures those late 60s octave-up fuzz tones. Transformer-coupled germanium diodes produce sounds that range from a subtle octave-up to thick, harmonically-rich sonic textures, and synth-like tones.
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Page 2: Table Of Contents
TABLE OF CONTENTS TOOL LIST ……………………………………………………………………………………….2 PARTS LIST DRAWINGS……………………………………………………………………...3, 4 FINAL ASSEMBLY REFERENCE DRAWING…………………………………………………..5 SOLDERING TIPS ……………………………………………………………………………….6 STEP BY STEP ASSEMBLY INSTRUCTIONS …………………………………………..7 - 10 Section 1 – Mount Large Components ………………………………………………….7 Section 2 – Wire Large Components ……………………………………………………….7 Section 3 – Mount Components to Terminal Strips ………..……………………………..8 Section 4 –... -
Page 3: Parts List Drawings
PARTS LIST 1 Stranded Wire (22 AWG) - Red 3PDT Foot Switch K-PUL1569 (4 FT) P-H501-L-BLK Enclosure P-H1590BBCE-BK Potentiometers: 1KL and 500KA R-VA1KL R-VA500KA MXR Style Knob P-K345-GLOW Terminal Strip with 5 Terminals P-0501H Battery Clip S-H155 Terminal Strip with 8 Terminals P-0802H ¼”... - Page 4 PARTS LIST 2 Audio Transformer (1.5K : 600 Ω) 220kΩ Resistor ½ W 220Ω Resistor ½ W P-T42TM022 R-A220K R-A220 220K yellow brown gold gold NPN BJT (2N5088) 470Ω Resistor ½ W 680kΩ Resistor ½ W P-Q2N5088 R-A470 R-A680K 680K 5088 yellow blue...
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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. Orient the enclosure with the two 5/16" holes on top. Apply the sticker to the top of the box then use a blade to cut out the holes. See pg 13 for guide. Using the seven screws, nuts and lock washers provided, fasten the five terminal strips to match DRAWING 2. -
Page 8: Section 3 - Mount Components To Terminal Strips
Strip and tin a 2" piece of wire and connect Footswitch lug 8 to the output jack’s tip lug. Strip and tin a 1 ½” piece of wire and connect Footswitch lugs 3 and 9. Strip and tin a 2” piece of wire and connect Footswitch lug 2 to the input jack’s tip lug. Strip and tin a 4"... - Page 9 Connect the 820K resistor to terminals #2 and #3. Push this component down slightly to allow room for the next component. Do not solder the connection on terminal #3 yet. Connect one of the 33µF caps to terminals #1 and #3. Make sure the negative end negative (-) end of the cap is connected to terminal #1.
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Page 10: Section 4 - Finishing Up
Connect the remaining 100µF cap to terminals #17 and #19. negative end 100µF 25V Make sure the negative (-) end is connected to #19. mounting tabs Press the metal mounting tabs of the transformer inward so they are flush with the bottom of the transformer. Now place the transformer upside down in the enclosure in the area shown on DRAWING 4. -
Page 11: Assembly Drawings (4 Drawings)
DRAWING 1 5/16" 5/16" 1/4" 1/8" 1/8" 1/8" INSIDE VIEW OF THE ENCLOSURE 15/32" 1/8" 1/8" 1/4" 1/8" 1/8" 15/32" 3/8" 3/8" DRAWING 2 500KA... - Page 12 DRAWING 3 500KA DRAWING 4 “P” 500KA .001µ 1.2K 150p 3906 200K 220K 680K .1µ black...
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Page 13: Sticker Application
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. - Page 14 150p 1.7 VDC 220K 100µ .001µ MPSA18 3PDT Foot Switch 2N3906 NPN BJT PNP BJT Collector P-T42TM022 Collector DCR Measurements Base Base “P” 46.5 Ω 61.9 Ω Emitter Emitter Copyright © 2021 by modkitsdiy.com “The Ring In Return” (K-903) Schematic...
- Page 15 Use this troubleshooting supplement to help: Measure DC voltage test points to identify major discrepancies and locate problem areas. (Keep in mind that the voltage measurements will vary slightly from kit to kit. The voltages you measure should be in the same ballpark, but do not expect to get the exact same value.) Using a volt meter, connect the ground side lead of the meter to any ground point on the pedal.
- Page 16 Measuring AC Voltages from the Guitar Signal Once your DC voltages are in order, if your kit is still not working properly, you can measure AC voltages along the signal path to troubleshoot further. Spring Terminal (Output) You will need a volt meter that can measure the small signal AC voltages that electric ¼”...
- Page 17 1.7 VDC 1.7 VDC 220K 100µ .001µ MPSA18 3PDT Foot Switch 2N3906 NPN BJT PNP BJT Collector P-T42TM022 Collector DCR Measurements Base Base “P” 46.5 Ω 61.9 Ω Emitter Emitter Copyright © 2021 by modkitsdiy.com “The Ring In Return” (K-903) Schematic...
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