Category: Tone Controls

Arduino Controlled Bass Mid Treble and input selector

My LC75341 project was a bit of a disappointment. It was working ok but it only offers bass and treble controls. The frequency response is not that good. It has very limited controls. I decided to stop that project because it is not what I am looking for. Now after lots of research, I stumble upon this digitally controlled bass mid treble IC from ST. What is great is that it has 7 band spectrum analyzer feature and a differential input. Plus it also has Q and frequency control and a subwoofer output. This is almost exactly what I want to do.

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Passive tone control circuit

If you are looking for a passive tone control for bass and treble control, here’s a simple one. Take note that because it is a passive circuit, it has no capability to boost signal. This circuit can only be used for high level source like car stereo speaker output. For headphone output, you may need to change some resistor values to decrease the attenuation of the signal. This will also modify the response of the circuit.

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Passive Bass and Treble Booster

In most cases, we love to set the bass and treble setting to maximum when listening to music. This gives us a nice sound with bass and treble turned up. Here’s a simple circuit than can be placed at the input of your amplifier to boost the bass and treble. Keep in mind that this circuit is passive, meaning you can’t really boost signal using a passives circuit.

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Stereo Tone Control using transistor

Last time I posted about a tone control project using tone control here: simple-tone-control-design/

But that project is only a mono one and you must build 2 to have an stereo channel. So I made a simple PCB design for those who want to build the stereo version. For more information please click on the link above. It is basically the same.

 

The PCB design is made using Eagle PCB as usual and using a single layer PCB

Download:



Download page

Arduino Controlled Bass Treble Volume and input Selector

Last time I have posted about how to control the LC75341 IC using arduino nano. And I also posted about how to modify the bass response of the LC75341 IC. This time I will be building a home amplifier for my TV, it will also feature a bluetooth reciever so that I can play via my phone.

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LC75341 Bass response modifications

Last time I have a blog post regarding on how to control the LC75341 tone control using arduino. I never really tested the performance of that IC until recently I got time to play with it. My initial impression was not good. The bass sound seems very thin and I can’t get the “boomy bass” sound that I wanted. Maybe its just me but the bass sound is thin compared to my little JBL flip bluetooth speaker. By the the way, the kit was from E-Gizmo’s digitally controlled tone control. I have investigated and model the circuit of the LC75341 tone control for simulation and the simulation results confirm what I am hearing.

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5 Band Equalizer Design

Here is a relatively simple 5 band equalizer that uses an IC LA3600 especially made for 5 band equalizer application. It has a relatively simple circuit that is easy for PCB layout. LA3600 make it easy to build your own 5 band equalizer with relatively few components. It will also be easier to design a single PCB since it only have very few components.

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3 band tone control design

The tone control i posted last time was simple with only bass and treble control. it is also a mono circuit, you need to build two pcb to make it stereo. Now let’s build a little more complicated, a stereo tone control with mid control. If you haven’t tried building any PCB, I suggest try first the more simple tone control circuit. I will also include the simulation file just in case you want to change the response of the circuit.

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LC75341 tone control using arduino

LC75341 is a digitally controlled analog tone control for audio applications. You can control parameters such as Bass, Treble, Volume and gain through its digital serial data transfer. The data is a 40 bits wide, 8 bits for the address and the 32 bits is the controls data. It is very unusual and you cannot use the microcontrollers built in UART, I2C, etc. I can’t find anywhere on the internet any examples of programs to control this particular IC so I made one for myself. I want to share the code for anyone who want to build this kind of project. The code is simple and I will only share the part of the code that sends data control to the chip. It is up to you to modify it according to your needs.

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