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EAE DIY Fuzztain Clone Builder's Manual

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Fuzztain Clone
Builder's Guide
Version 1
July 23, 2024
John W Snyder

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Summary of Contents for EAE DIY Fuzztain Clone

  • Page 1 Fuzztain Clone Builder’s Guide Version 1 July 23, 2024 John W Snyder...

  • Page 2: Table Of Contents

    Revision History Version Changes Draft Copy Contents 1 Introduction 1.1 Background ........1.2 Operation .

  • Page 3: Introduction

    But like many of my projects around that time, it was quickly abandoned for the next cool thing. Once Brad started working at EAE full time, he brought one in and we realized that it was actually a pretty fascinating design, absolutely worthy of inclusion in our DIY catalog.

  • Page 4: Before You Start

    Appendix. 1.4 Disclaimers and Licensing Caution: EAE is not responsible for the outcome of your build and cannot offer direct support or troubleshooting beyond this document. This document and all associated materials are released under the Creative Com- monce BY-NC-SA License.

  • Page 5: Parts List

    2 Parts List The following parts list assumes a build in the stock configuration. Parts marked with an asterisk (*) have additional information in Section 7, where you can also find suggested mods. We recommend reviewing possible modifications before you begin.
  • Page 6 Capacitors Value Ref #s Description 100p Capacitor, MLCC NP0 25V min 5mm LS 220p Capacitor, MLCC NP0 25V min 5mm LS Capacitor, Box Film 5mm LS 3.3n Capacitor, Box Film 5mm LS Capacitor, Box Film 5mm LS 100n C2, C4 Capacitor, Box Film 5mm LS 220n Capacitor, Box Film 5mm LS...
  • Page 7 Resistors, Potentiometers, Trimpots Value Ref #s Description 100k Audio SUSTAIN Potentiometer, 16mm PCB Mount Right Angle Audio VOLUME Potentiometer, 16mm PCB Mount Right Angle Reverse FUZZ Potentiometer, 16mm PCB Audio Mount Right Angle SPDT MODE Switch, SPDT On/On Minua- ture (PCB Pins) Off-Board Parts Value Ref #s...

  • Page 8: Wiring

    3 Wiring The wiring diagram is shown in Figure 1. For overall assembly instructions please refer to the Appendix. Wire pads on the board are listed in Table 1. For convenience, pads make connections to hardware located in close proximity. Note that the LED is mounted on the reverse side of the footswitch PCB, or can be wired off-board using a bezel.
  • Page 9 Function Input Jack Tip Output Jack Tip G1, G2 Jack Sleeve Connections (Ground) 9V input (DC jack) DC jack ground Bypass footswitch connection to input jack LED + to footswitch LED/Footswitch ground Send/Input to effect Return from effect Bypass footswitch connection to output jack Table 1: List of wire pads and functions.

  • Page 10: Drill Template

    4 Drill Template Print this page out using 1:1 settings on your printer and fold to form the drill template. We recommend drilling pilot holes first to check alignment.

  • Page 11: Schematic

    5 Schematic...

  • Page 12: Circuit Analysis

    6 Circuit Analysis 6.1 Signal Path The Fuzztain consists of two primary circuit blocks. First is the compressor, second is the clipping amplifier which serves as the fuzz stage. Some things jump out im- mediately: first, the compressor design is pretty unusual on multiple levels. Second, the fuzz circuit looks more like a stereotypical soft-clipping overdrive! The Fuzztain has some truly clever design tricks up its sleeve, which we’ll dive into below.
  • Page 13 plied to the gate. In other words, a MOSFET acts like a voltage-controlled resistor with resistance R (where DS stands for Drain to Source). In this case we have three MOSFETs contained within the CD4007 operating as the lower leg of a volt- age divider.

  • Page 14: Modifications

    7 Modifications Caution: Modifications should not be attempted unless you have the means to troubleshoot changes beyond the base configuration. 7.1 Some modifications This circuit really doesn’t need much in my opinion, but here are some things you can try. •...

  • Page 15: A Generic Assembly Guide

    A Generic Assembly Guide This is a fully general pedal assembly procedure that applies to all EAE open source projects. Note that minor details can vary between PCBs. But this will serve as a quick reference for those already familiar with this type of assembly.

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