Project · Fuzz Tones
Lava Rim 2
Thanks to Aron Nelson for this great Fuzz tone! This project can be built on the EHX™ Muff Fuzz™ Replica PCB. A truly awesome sound that is far superior to the sound of the stock transistor Muff Fuzz™.
Project files
Everything you need to build it
Lava Rim 2 Ready-For-Transfer Printed Circuit Board Layout (This project uses the EHX™ Muff Fuzz™ PCB) - For use only if you are a complete DIY person who wants to etch and drill your own PCB. Otherwise, we recommend you ignore this PCB mask and buy the Ready-to-Solder Printed Circuit Board.
Parts layout
Parts Layout / Wiring Diagram
What you will need
Bill of Materials
Version 2012February14 · Copyright 2012 JD Sleep · Permission refused for posting/serving this file from any site other than www.generalguitargadgets.com · Trademarks are property of their owners
Resistors
| Resistor ID | Value | 3-band Marking | 4-band Marking |
|---|---|---|---|
| R1 | 100k Trimmer | ||
| R2 | 50k Trimmer | ||
| R3 | 100k | brown-black-yellow | brown-black-black-orange |
| R4 | 100k | brown-black-yellow | brown-black-black-orange |
| R5 | 5k linear potentiometer | ||
| R6 | 50k Log Potentiometer | ||
| R7 | 1k | brown-black-red | brown-black-black-brown |
| R8 | 1M5 (1.5M) | brown-green-green | brown-green-black-yellow |
| R9 | 5K Trimmer | ||
| R10 | 100k Linear Potentiometer |
Capacitors
| Capacitor ID | Value | Type | Possible Marking |
|---|---|---|---|
| C1 | 0.1µF | Film | 104 |
| C2 | 0.22µF | Film | 224 |
| C3 | 47µF | Aluminum Electrolytic | 47µF |
| C4 | 220pF | Ceramic | 220 |
| C5 | 22µF | Aluminum Electrolytic | 22µF |
Potentiometers
| Part ID | Value | Type |
|---|---|---|
| R1 | 100k | Trimmer |
| R2 | 50k | Trimmer |
| R5 | 5k | Linear |
| R6 | 50k | Log |
| R9 | 5K | Trimmer |
| R10 | 100k | Linear |
Other
| Part ID | Part Name |
|---|---|
| D1 | 1N914 |
| D2 | 1N914 |
| Q1 | Low Gain NPN such as 2N3904 |
| Q2 | Low Gain NPN such as 2N3904 |
| J1 | Stereo quarter-inch jack |
| J2 | Mono quarter-inch jack |
| J3 | DC Jack |
| B1 | 9 volt battery (not included in the Kit) |
| Sw1 | Heavy Duty 3PDT foot switch 9v battery snap, Printed Circuit Board, 24 gauge stranded wire, Enclosure, Knobs |
How to build it
Instructions
Version 2012February17 · Copyright 2012 JD Sleep · Permission refused for posting/serving this file from any site other than www.generalguitargadgets.com · Trademarks are property of their owners
This is a fantastic Fuzztone from Aron Nelson. This is a very simple kit to build. Follow the Bill of Materials, the Layout diagram and General Build Instructions. The Lava Rim 2 Fuzz is built on this same PCB as the transistor verions EHX™ Muff Fuzz™. Note that the kit may come with a “can” transistor for Q1, below are the pin designations.
Here's an inside view of the unit we built to give you some general ideas if needed.
Here is a chart of voltages taken at the transistor pins. Due to the trimmer settings, the voltages may vary, use these voltages as a guideline. You'll want to tune the trimmers by ear to the best settings, these listings are to give a general idea of voltages you will be getting.
Component
Location
9 volt power supply (2N5089) Q1
Q2
Voltage
9v
Collector
2.3v
Base
0.7v
Emitter
0v
Collector
4.4v
More about this project
Notes, sounds and related links
Ready to build? We have the kit.
Would you like a Ready to Solder Circuit Board for this project? Note: This is the Muff Fuzz™ PCB