aion Lab Series - User Manual

L4 BASS PREAMP 1
PROJECT NAME
L4 BASS PREAMP
BASED ON
EFFECT TYPE
PROJECT SUMMARY
DOCUMENT VERSION
Lab Series
®
L4 Bass Preamp
A pedal adaptation of the two-channel preamp of the Lab Series® L4 bass amplifier from the late 1970s,
a downtuned relative of the legendary L5.
Bass preamp, overdrive & compressor 1.0.0 (2023-07-04)
BUILD DIFFICULTY
Advanced
Actual size is 5.48” x 2.61” (main board) and 4.90” x 0.71” (bypass board).

Summary

L4 Bass Preamp Project Identification

Project Introduction and Background

L4 Bass Preamp Usage Guide

Channel 1 Control Functions

Explains the Deep, Treble, Mid, Bass, and Volume controls for Channel 1.

Channel 2 Control Functions

Explains Deep, Volume, Treble, Bass, Mid, and Frequency controls for Channel 2.

Master and Compressor Controls

Details on Master, Limit, and Comp controls common to both channels.

Circuit Design Notes: Power Supply

Power Supply Design Considerations

Discusses the bipolar +/-15V supply and DC-DC converter solutions.

Build Notes: DC Converter Selection

Build Notes: Trimmer Calibration

Distortion Trimmer Adjustment

Procedure to set the distortion threshold using a 1kHz sine wave.

Compressor;Limiter Trimmer Adjustment

Procedure to set the compressor/limiter threshold.

Build Notes: Component Specifics

Potentiometer Value Adjustments

Explains how to achieve original 2.5k values using standard pots and parallel resistors.

LM13700 vs. CA3080 IC Substitution

Discusses replacing CA3080s with the LM13700 and necessary modifications.

Schematic Diagram: Channels 1 & 2

Schematic Diagram: Distortion, Compressor, Power

Drill Template Instructions

Enclosure Drill Template

Enclosure Layout Diagram

Wiring Diagram

License and Document Information

aion Lab Series Specifications

General

Brand	aion
Model	Lab Series
Category	Amplifier
Language	English