Passion in Electronics
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.
Continue reading “Arduino Controlled Bass Treble Volume and input Selector”
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.
Here’s a simple audio mixer circuit that you can use to connect up to 4 mics on your amplifier. The potentiometers or volume controls are not part of the PCB to make it smaller.
2.1 Channel audio systems are so popular on most home sound system with low power output(usually below 50W). It only composed of left, right and a subwoofer speaker. The signal from the subwoofer is derived from both channels and filtered to output only the low frequency usually below 200Hz. Since the low frequencies are being produced by the subwoofer, it should be cut off on the main speaker.
Here is another simple stereo tone control circuit. What makes it simple is that is uses a DC controlled tone control IC LM1036. The potentiometer act like a variable voltage divider and the output is fed to the IC that controls the level of Bass, Treble, Volume and Balance.
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.
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.
Low Voltage Disconnect circuit are used to disconnect the battery to the load when the battery voltage drops to certain level. This avoids further discharging of the battery. This is very useful for devices that uses rechargeable batteries.
I have featured several articles on solar power charging circuits, now I am actually making one for my home use. I am currently on works to develop this system, although I know the theories behind it, I still learned a lot in this process. This system will be used for cellphone charging and a small light.
If you are a electronic hobbyist and at the same time a guitarist, this project is for you. I have seen many circuits of guitar preamp online but none of them gives you the PCB design and circuit simulations. I already made a version of this project years ago and it works. I also have included simulation files together with the eagle PCB files for you to download if you want to build this project. Take note that the capacitor sizes are not yet taken into account. You will need to edit some few capacitors like the C10 which will be bigger than it is on the board.
