Amplifier Panel Design

[Laurene Arrison]

Forthe modern guitar player, tone can make or break any performance. Whether playing a live show, recording in a studio, or simply practicing with friends, the amplifier is a key component of music. The gold standard in this area has long been high-end tube amplifiers, providing warm shimmering tone with tons of power. These come with some significant drawbacks however, as many amplifiers are upwards of 60lbs, and can cost more than $1500, far out of the price range of hobby musicians, or those just getting started. Using flat-panel speaker technology, our group seeks to address these problems by designing a low cost and lightweight alternative, that provides the same dynamic tone loved by all, with scalable power to fit all needs.

Designed by members of the ECE department, these flat-panel speakers use exciters to vibrate a surface in an extremely specific way, generating very high fidelity sound. Part of the design of the speakers relies on drivers placed in different locations generating different frequency bands, so a crossover is required.

Using a laser vibrometer scan (shown below), the cutoff frequency can be determined for best overall frequency response. We chose 750 Hz for our cutoff, as it presents the most stable response for the treble driver (>750 Hz) and bass driver array (

Tone control is one of the essential stage for a typical guitar amplifier, which is usually a two-band/three-band graphic equailizer. In this project, the tone control unit is designed to be a three-band EQ.

The tone control stage is the second stage with three knobs for bass, mid, treble controls. The output signal from the preamplifier stage goes through an input buffer and splits in three parallel branches.

The gain of each frequency band is controlled by three potentiometers. After that, the filtered signals go through three unit gain buffers to prevent interfering with each other and are connected to a common point.

The master volume is controlled by the last potentiometer after the output buffer. This stage is purely subtractive, which means it is attenuating the signal level and could then be amplified by the class-D power amplifier stage.

The final stage consists of a Class-D Power Amplifier mixed-signal circuit. A Class-D amplifier operates using an internal oscillator generating a high frequency wave being modulated by the input signal. This signal is then amplified, leaving a large PWM wave which is then filtered using an LC network, leaving an amplified version of the original signal.

These chips are perfect for our use, as they are capable of a wide range of amplification and power output at a cheap cost, small size, and high efficiency. Texas Instruments manufactures several IC chips that implement these amplifiers, including devices capable of up to 50W of power output. However, due to the ongoing chip shortage, there has been an availability issue with many of these ICs, so tradeoffs had to be made.

Secondly which company can I send the design to for printing and if there are other information you can assist me with to help my success. Besides, I an trying to design lab trainers if you have any information regarding design plastic enclosure ad the companies that does that please help inform me too.

I got tired of measuring so I designed visually with slider positioning.If you make STL Ready false, it shows the opening in the lid and some parts in 3d. I can't get this to work in the customizer so it always make a proper STL.The customizer...

I use KiCad to design my own front panels, I have made my own symbols that I use just for this purpose.

Some of my panels have different graphics on the front and back, one has a bass amp on one side and a lead amp on the other side

My panels are simple as I flood fill the whole panel as a ground point and all symbols are connected to this ground plane.

I think with some careful work you could make a 2 sided symbol where the back has tracks for SMD components to mount while the front looks like you want.

The other way you could do this is to make a symbol up for the front panel that shows a component with the holes and then place a SMD component on the back and run tracks to the holes for the front component.

12w amp pcb19201082 277 KB

For background/foreground music and paging applications, Bose Professional FreeSpace IZA 2120-HZ integrated zone amplifier elevates the audio experience when using FreeSpace loudspeakers. Optimized for commercial applications, FreeSpace IZA amplifiers feature selectable Loudspeaker EQ to enrich audio quality, Opti-Voice paging for clear speech intelligibility while providing seamless transitions and Dynamic EQ that ensures full and balanced music at any volume level.

Dual remotes support optional volume/source selection for independent, or combined, zone control which eliminates the need for bulky, inefficient, and sound-altering 70/100V in-line volume controls

The integrated zone amplifier offers a variety of easy-to-use input connections (mic/line/page), input gain and output level adjustments, and operational modes. Built-in FreeSpace 3 System, FS3B subwoofer, FreeSpace FS2 and FS4, and DesignMax DM2 and DM3 loudspeaker EQ presets can be selected for loudspeaker optimization.

The IZA integrated zone amplifier features a fixed global compressor/limiter, FreeSpace 3 System, FS3B subwoofer, FreeSpace FS2 and FS4, and DesignMax DM2 and DM3 loudspeaker EQ presets, dynamic equalization, Opti-Voice paging, page and auxiliary zoning, detection and prioritization algorithms, and AGC (Automatic Gain Control).

The IZA integrated zone amplifier can easily be adjusted using front panel controls. Source selector and master volume control, located on the front panel, allow a customer to adjust their system for daily operation. Optional Volume control with A/B switch allows the system to be adjusted from remote locations.

Connections can easily be made to the rear panel. No computer is required. The amplifier comes with two rack ear accessories for rack mounting as well as four plastic feet accessories for surface placement.

The FreeSpace IZA integrated zone amplifier is designed to provide optimized performance of FreeSpace 3 System, FS3B subwoofer, FreeSpace FS2 and FS4, and DesignMax DM2 and DM3 loudspeakers. A switch allows the selection of the loudspeaker EQ, or a generic high-pass mode for use with FS3 systems or other passive loudspeakers.

* When using a REMOTE connection with A/B source selection, either the REMOTE or the front panel can be the MASTER SOURCE control for A/B select, selectable via a DIP switch. MASTER LEVEL control will always be from the REMOTE, and the front panel MASTER LEVEL control becomes disabled.

The amplifiers are fully protected against loudspeaker output shorts, high temperature damage, and excessively low or high AC line voltage conditions. The IZA 2120-HZ also has an integrated 55 Hz high pass filter to avoid potential transformer saturation.

For background/foreground music and paging applications, Bose Professional FreeSpace IZA 2120-LZ integrated zone amplifier elevates the audio experience when using FreeSpace loudspeakers. Optimized for commercial applications, FreeSpace IZA amplifiers feature selectable Loudspeaker EQ to enrich audio quality, Opti-Voice paging for clear speech intelligibility while providing seamless transitions and Dynamic EQ that ensures full and balanced music at any volume level.

A commercial audio amplifier is a device used to increase the power of audio signals to drive loudspeakers in commercial settings such as restaurants, retail stores, and educational facilities. Unlike consumer-grade amplifiers, commercial amplifiers are typically designed for continuous operation and higher power output.

Commercial audio amplifiers come in various forms, including single-channel (mono) and multi-channel (stereo or multi-zone) configurations, as well as different classes of amplifiers such as Class A/B or Class D. Some amplifiers are designed for specific applications like distributed audio systems or high-impedance speaker systems. Optimal Audio offers three reliable, high power Class A/B design amplifiers supporting stereo, bridge and parallel modes, alongside three Class D multichannel direct drive constant voltage amplifiers with 30 DSP settings available for maximum performance of Optimal Audio loudspeakers.

3a8082e126