RUNOFFGROOVE PEPPERMILL
2
TABLE OF CONTENTS
1
Project Overview
6
Drill Template
2
Introduction & Usage
7
Enclosure Layout
3
Parts List
8
Wiring Diagram
4
Build Notes
9
Licensing
5
Schematic
9
Document Revisions
INTRODUCTION
The Runoffgroove Peppermill is a simple circuit designed to showcase the tube-like clipping
characteristics of the J201. It’s a very minimalist design which is composed of nothing more than a
MOSFET gain-boost stage into a JFET. The gain can be adjusted between the two stages to control the
amount of clipping, and an output volume is present at the end, and that’s it.
The Aion FX version of the Peppermill is a direct adaptation of the original circuit, with one modification:
the addition of a tone control. The original circuit has a R-C lowpass filter right before the volume,
and by making the resistor value adjustable, you end up with a useful tone control without otherwise
affecting the original circuit.
Since the J201 is very difficult to find in TO-92 through-hole format, and many DIY hobbyists are
intimidated by SMD parts, Aion FX offers
that have been pre-soldered to adapters
so they can be used as through-hole parts.
USAGE
The Peppermill has the following controls:
•
Drive
controls the volume going into the JFET clipping stage. At higher drive levels, the JFET will
overload and clip the signal.
•
Tone
is a simple passive low-pass filter that can be adjusted for more or less treble.
•
Volume
controls the overall output of the effect.
