CopperSound Substitution Box FETs

A Modern Approach to Prototyping: The Substitution Box Serving Designers

In DIY electronics, especially in audio, a small change in value can transform a filter, gain, dynamics, or saturation texture. The CopperSound Substitution Box fits this rapid experimentation logic: instead of constantly removing and replacing components on a breadboard, you switch from one value to another in seconds. It's a simple and effective way to validate an idea, fine-tune a setting, or compare design options with a much more comfortable listening continuity.

Who Is the CopperSound Substitution Box FETs For?

This substitution box is aimed at pedal builders, DIY enthusiasts, students, and technicians who want to save time during testing phases. It is especially useful if you work on input stages, buffers, switching sections, or circuits where the choice of transistor (JFET or MOSFET) directly influences the response and behavior of the setup. Whether you are prototyping on a breadboard or validating before PCB integration, the goal remains the same: iterate faster and decide with your ears and measurements rather than repetitive handling.

Operation and Highlights for Your Tests (JFET, MOSFET, and More)

Change Components Without Interrupting Your Testing Flow

The principle is simple: you connect the Substitution Box to the points in your circuit where you want to replace a component, then select another value or type according to the model. This method avoids errors related to repeated handling (damaged leads, poor contacts, swapped components) and allows you to maintain a clear comparative approach, step by step.

A Tool Focused on Listening, Measurement, and Decision Making

In audio DIY, multiple options are often compared before fixing a value: adjusting filtering, controlling gain range, choosing a diode reference, or determining clipping behavior. The CopperSound Substitution Box facilitates this A/B work: you keep the same circuit, the same power supply, the same test chain, and only vary the targeted component. Result: faster and more consistent choices, both on the oscilloscope and by ear.

Assembled and Ready to Integrate into Your Prototyping Setup

Each model is supplied fully assembled, allowing immediate integration into your workstation. This is a real advantage if you want to focus on circuit design rather than tool preparation.

Technical specifications

Effects	Buffer	Color	Black
Use	electric guitar

Type	DIY substitution box	Diodes	24 pairs of diodes (small signal, zener, Schottky, MOSFET, and germanium)
Usage	real-time quick selection of component values for prototyping	Ceramic capacitors	24 values, from 1 pF to 820 pF (50 V)
Implementation	wire insertion at desired points (breadboard)	Electrolytic capacitors	24 values, from 1 uF to 470 uF (25 V)
Delivery condition	fully assembled	Transistors	12 different NPN BJTs
Resistors	24 values, from 10 Ohms to 1 MOhm (1/4 W)	FETs	6 N-channel JFETs
Film capacitors	24 values, from 1 nF to 1 uF (63 V)	MOSFETs	6 N-channel MOSFETs