Overview
Imagine you’re setting up your home audio system, eager to enjoy your favorite music and podcasts with pristine clarity. You’ve heard about the benefits of modular components, and specifically, the importance of a reliable switching center circuit in optimizing your preamplifier’s performance.
In today’s article, we are going to make a “Modular Preamplifier Switching Center Circuit”.
Modular Preamplifier Switching Center?
A Modular Preamplifier Switching Center refers to a component or system within an audio setup designed to manage the routing of audio signals from multiple sources to a preamplifier. It typically consists of a set of inputs that can be selected and switched between using control mechanisms such as switches or software controls.
This module serves as a crucial addition to the Modular Preamplifier Control Center when more than two sources require connection to the preamplifier chain. It facilitates the selection of four high-level inputs using SW1 and routes them to the output. To integrate this module, its output must be linked via an appropriate cable to one of the two inputs of the Control Center module. This configuration grants the user access to a total of five inputs with this combined module setup.
The Switching Control also incorporates the “Double Bar” functionality, enabling the routing of an input signal to an external unit like a recorder (tape or digital), distinct from the signal being played through the amplifier. For instance, you can listen to a CD while sending the signal from a radio station through the Tuner to the recorder. SW2 facilitates this selection.
Similar to other modules in this series, each electronic board can be installed in a standard enclosure. Hammond extruded aluminum cases are recommended for housing these preamp boards, particularly the 16 x 10.3 x 5.3 cm or 22 x 10.3 x 5.3 cm sizes, which present an appealing stacked appearance. Below is an illustration depicting a potential layout of the front and rear panels for this module.
Hardware Components
To make this circuit, you’ll need the following hardware components to get started:
| S.no | Components | Value | Qty |
|---|---|---|---|
| 1 | Resistors | R1,R2,R3,R4 = 100K 1/4W Resistors R5 = 560R 1/4W Resistor | 1 1 |
| 2 | Rotary Switches | SW1,SW2 = 2 poles 4 ways | 1 |
| 3 | RCA audio input sockets | J1 to J6 | 1 |
Schematic
Notes:
- No power supply is necessary for this module
- The circuit diagram shows the Left channel only, so all the parts must be doubled except SW1 and SW2 which are double pole switches, i.e. ready for stereo.
Switching Center Front Panel
Switching Center Rear Panel
Conclusion
The Modular Preamplifier Switching Center Circuit plays a crucial role in managing audio signal routing efficiently. Its benefits include improved signal quality, flexibility in connecting multiple audio sources, and compatibility with various systems. Integrating this circuit enhances the overall audio experience by providing seamless control and optimal signal management.
