Inductive Distortion Circuit for Adjustable Low-Level Audio Drive
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Solution Overview
Problem
Existing systems for creating harmonic and intermodulation distortion in electronic signals, such as those used in electric guitar amplifiers, lack adjustability and efficiency, often requiring heavy, expensive tube amplifiers and resulting in undesirable distortion characteristics across varying volume levels.
Innovation Solution
A distortion device incorporating a transconductance stage, a current amplifier stage, and a transformer or inductor portion, where the transconductance stage uses a capacitor to develop current through a resistor, which is then amplified and supplied to a transformer or inductor, producing a low-level signal that can be routed through volume control and effects loops, allowing for adjustable distortion levels without the need for overdriving tubes or using heavy amplifiers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If a tube amplifier is overdriven to achieve desired distortion characteristics, then harmonic distortion is produced, but the amplifier must be set to a specific volume level and requires heavy, expensive tube components
Solution Approach 1:
The amplifier is divided into separate functional sections: a preamplifier section that generates distortion signals and a power amplifier section that amplifies them. This segmentation allows the distortion characteristics to be established independently at low levels in the preamp section, while the power section can operate at various volume levels without requiring tube overdrive, thus resolving the contradiction between achieving specific distortion characteristics and maintaining volume level adaptability.
2Manufacturing precision
If power attenuators are used to reduce speaker power while maintaining amplifier volume, then distortion characteristics are preserved, but the system becomes more complex and requires additional equipment
Solution Approach 1:
The distortion generation function is merged into the preamplifier section of the same amplifier unit, eliminating the need for separate power attenuators or additional equipment. The preamp section generates the distorted signal at low levels, which is then amplified by the integrated power amplifier section, preserving distortion characteristics while reducing system complexity and integrating all functions into a single device.
3Manufacturing precision
If speaker efficiency is decreased to produce distortion, then distortion characteristics are achieved, but excessive heat is dissipated and the amplifier remains heavy and expensive
Solution Approach 1:
The distortion signal is generated preliminarily at low levels in the preamplifier section before being amplified by the power amplifier section. This preliminary generation of distortion characteristics allows the power section to operate efficiently at various volume levels without requiring reduced speaker efficiency or excessive power dissipation, as the distortion is already established in the signal before power amplification.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This solution provides a compact, efficient means to achieve desired distortion characteristics across different volume levels, maintaining clarity in higher frequencies and producing smooth sounds at low distortion levels, suitable for various music genres, while avoiding excessive heat dissipation and the need for multiple amplifiers.
Implementation Method 1
a transformer portion electrically coupled to the current amplifier stage... output of the transformer portion comprises a low-level signal
Data Source
AI summary
A distortion device includes a transconductance stage, a current amplifier stage electrically coupled to the transconductance stage, and a transformer portion electrically coupled to the current amplifier stage. The transconductance stage includes a first capacitor to provide a ground to a resistor, and voltage across the resistor develops a current through a second capacitor to the current amplifier stage. The current amplifier stage includes a positive half cycle and a negative half cycle. The positive half cycle and the negative half cycle amplify the current from the transconductance stage and supply the amplified current to a primary winding of a transformer in the transformer portion, and the output of the transformer portion includes a low-level signal.