aion SAPPHIRE Руководство - Страница 2
Просмотреть онлайн или скачать pdf Руководство для Аксессуары для музыкальных инструментов aion SAPPHIRE. aion SAPPHIRE 13 страниц. Amp-like overdrive
Печатать страницуTABLE OF CONTENTS
1 Project Overview
2 Introduction & Usage
INTRODUCTION
The Sapphire Amp Overdrive is based on the BOSS
pedals in continuous production since it was first released in 1995. It's been used by a wide variety of
artists including Mike McCready (Pearl Jam), Robert Smith (The Cure), Tom Morello, and even Prince.
The Blues Driver bears many similarities to the OD-2 Turbo Overdrive from 1988. This was the first
appearance of Boss's "discrete op-amp" circuit topology that uses two JFETs and a PNP transistor to
create a variable gain stage that can be controlled like an op-amp but clips gracefully when overdriven.
The Blues Driver starts with a circuit very similar to the OD-2, and then adds a slight bass boost to
the end to give it the signature fullness, along with some clipping diodes and a fixed-position Fender
tonestack for shaping the tone.
Despite its overwhelming popularity, the BD-2 is not without its flaws. On higher gain settings, the note
decay has been described as "fizzy" or "splatty". And while the bass-heavy EQ is distinctive, it's not as
flexible as other more transparent drives. Because of this, it's one of the most frequently modded pedals
out there, with Keeley's and Analogman's mods being the most popular.
Another notable one is the Galaxie Mod from
notes on page 7 and is strongly recommended. It's an extensive mod that replaces half of the passive
components, completely transforming the pedal into something new.
The Sapphire is based on the stock BD-2 circuit converted to true bypass. The bass boost has been made
variable, so it can be adjusted between the stock value and the Galaxie value.
The original BD-2 uses the 2SK184-GR JFET, a low-cutoff type similar to J201, but no longer made in
through-hole format. 2SK209-GR is the SMD version that is still in production and will perform exactly
the same as the originals. Each of the JFETs have extra pads for soldering SMD parts, but if you don't
feel confident in your SMD skills, Aion FX sells
through-hole applications.
USAGE
The Sapphire has four controls:
• Drive is a dual-gang control that simultaneously increases the gain of both discrete op-amp stages.
• Tone is a passive treble cut after the second gain stage.
• Bass is an active bass boost at the end of the circuit.
• Volume sets the overall output of the effect signal.
SAPPHIRE AMP OVERDRIVE
13 Licensing
®
BD-2 Blues Driver, one of their most popular
Machine Head
Pedals, which is documented in the build
2SK209-GR pre-soldered to adapter boards
to be used in
2