Project · Fuzz Tones
EHX™ Muff Fuzz™ Replica
Here is some information on the transistor version of the electro-harmonix Muff Fuzz™. Any trademarks on this page belong to their owners and not to General Guitar Gadgets.
Project files
Everything you need to build it
Muff Fuzz™ Replica Ready-For-Transfer Printed Circuit Board Layout - 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.
Schematic
Schematic
Parts layout
Parts Layout / Wiring Diagram
What you will need
Bill of Materials
Version 2009May26 · Copyright 2007 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 | brown-black-yellow | brown-black-black-orange |
| R2 | 10k | brown-black-orange | brown-black-black-red |
| R3 | 100k | brown-black-yellow | brown-black-black-orange |
| R4 | 100k | brown-black-yellow | brown-black-black-orange |
| R5 | 2k7 (2.7k) | red-violet-red | red-violet-black-brown |
| R6 | 100k Log Potentiometer | ||
| R7 | 1k | brown-black-red | brown-black-black-brown |
| R8 | 1M5 (1.5M) | brown-green-green | brown-green-black-yellow |
| R9 | 0 ohm or jumper wire | black | black |
Capacitors
| Capacitor ID | Value | Type | Possible Marking |
|---|---|---|---|
| C1 | 0.1µF | Film | 104 |
| C2 | 0.1µF | Film | 104 |
| C3 | 47µF | Aluminum Electrolytic | 47µF |
Potentiometers
| Part ID | Value | Type |
|---|---|---|
| R6 - Volume Control | 100k | Log (or Audio) Taper |
Other
| Part ID | Part Name |
|---|---|
| D1 | 1N914 |
| D2 | 1N914 |
| Q1 | 2N5089 |
| Q2 | 2N5089 |
| 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 Electro-HarmonixTM Muff FuzzTM Fuzztone replica known here as the EMTR Fuzz. This is a very simple kit to build. Follow the Bill of Materials, the Layout diagram and General Build Instructions. The original units had 2N5088. The kit includes 2N5089 (low noise version of the 2N5088) and also a pair of lower gain transistors. There are many options available for building this kit. Including using some trimmers instead of resistors in order to tune in a better sound. See the Modifications file on the project page for more information. Also note that the Lava Rim 2 Fuzz is built on this same PCB and you can get ideas for modifications by studying that project as well. 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. Use these voltages as a guideline. You may not get the exact readings listed, but should be somewhere in the area.
Component
Location
9 volt power supply (2N5089) Q1
Q2
Voltage
9v
Collector
1.7v
Base
0.6v
Emitter
0v
Collector
5.4v
Base
1.7v
Emitter
1.1v
Comments and questions are welcome and can be sent to [email protected]
More about this project
Notes, sounds and related links
Here is the schematic for the original transistor version of the electro-harmonix™ Muff Fuzz™.
Lava Rim 2
Here is a link to Aron Nelson's Lava Rim 2. He designed it after a Fuzz Face™ and Jordan™ Boss™ Tone, but it turned out to be a great modified version of the transistor Muff Fuzz™!
- Lava Rim 2 Project based on the schematic from Aron Nelson's Stompbox Page
Ready to build? We have the kit.
Would you like a Ready to Solder Circuit Board for this project?