Building a DIY 5.1 Audio Video Receiver – Part 7

Now that I have the front speakers, rear speakers and sub-woofer working, the next thing I wanted to do in my DIY AVR project was to bring up the center speaker. I ordered a TPA3118 amplifier board for Rs. 379 towards it. The only problem with the board (which I did not realize when I ordered it) was that it does not have a volume control. The repercussions of this mistake will soon become clear. Anyway, I connected the board to a 12V power supply. The same one that was powering the crossover board from my previous post. Output from … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 7”

Building a DIY 5.1 Audio Video Receiver – Part 6

In the last post I mentioned that I was looking for a crossover board. The one that I purchased is putting out a huge DC bias and I was not comfortable using it on my sub woofer. Wondering if it is a problem with the particular unit that I got, I ordered a replacement. Unfortunately, even the replacement has the same signature output. So I decided to do something about it myself. AC coupling capacitor For those of you who have done electrical engineering might recognize that adding a capacitor in series with the load will block DC offset. This … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 6”

Building a DIY 5.1 Audio Video Receiver – Part 5

So far I have finished bringing up 4 of my 5.1 speakers in my DIY 5.1 AVR project. If you missed, check out part 1, part 2, part 3 and part 4 of the series. Next I wanted to bring up my sub-woofer. Since I have an active sub-woofer, I did not need any amplifiers to drive it. I just need to connect the output signal from my audio source directly to the sub-woofer input. But there is a catch. If you connect the audio source directly to the sub-woofer, the sub would be wasting a lot of energy which … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 5”

Building a DIY 5.1 Audio Video Receiver – Part 4

As I mentioned in my last post, after measuring the frequency response and testing the TDA 7498, I decided to buy one more. The board I bought earlier did not have the right LC filter for a 6 ohms speaker. It was designed for 8 ohms speaker. So I decided to use that board for my rear surround speakers which were also 6 ohms. However, it is fine to have a slightly poor quality amp for the rarely used rear speakers. Then I set out searching for another TDA 7498 speaker amplifier board with a 680 nF capacitor RC filter. … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 4”

Building a DIY 5.1 Audio Video Receiver – Part 3

The TDA7498 class D amplifier board that I purchased to power my front speakers was working great. The audio quality is at par with what my Pioneer 5.1 AVR delivered using class AB amplifier. I could not tell the difference in audio quality. None the less, I wanted to make sure the quality is really as good as my ears led me to believe. Enter a function generator and oscilloscope to make sure the frequency response is satisfactory over the range of audible frequencies (20 Hz to 20 kHz). If you don’t happen to know, a class D amplifier uses … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 3”

Building a DIY 5.1 Audio Video Receiver – Part 2

If you did not read part 1 of building a DIY 5.1 AVR, I suggest you start from there. Here is some important points from my previous post — decided to go with a class D amplifier start with a 2-channel amplifier for front speakers the front speakers are rated at 130W and 6 ohms After searching through a lot of class D amplifier chips, I finally decided to go with TDA7498. They are rated for 100W at 6 ohms and that should be sufficient. Although I have the 130W speakers, I never really ran them at full power, so … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 2”

Building a DIY 5.1 Audio Video Receiver – Part 1

Alright, you already know the story of my electronics going puff during a power surge. One of the electronics that got burnt was my unnecessarily expensive Pioneer 5.1.2 AVR. The reason I put emphasis on unnecessary is because I rarely used all the features of the device. Don’t even know why I spent all the money :). After it stopped working, I opened and checked everything that I could figure out. But I didn’t notice any obvious problems. The AVR just boots up, turns on the amplifier relay and turns off. Since it failed during COVID lock down, I couldn’t … Continue reading “Building a DIY 5.1 Audio Video Receiver – Part 1”

Rain Water Harvesting Project

When it came to self-sustainability, I was interested in doing three projects — growing organic vegetables, setting up water harvesting and generating power from solar panels. While we cannot certainly be fully self sustaining if I completed the projects, we could at least be less dependent on outside factors. A while ago we started growing vegetables in our side yard and terrace. I need to get around to writing a post on it. Some topic or the other always comes up and I write a post on it and eventually the post on terrace garden is way overdue. I did … Continue reading “Rain Water Harvesting Project”

How to Change Scooter Battery

Recently, the trusted battery in my scooter finally died. We own a Hero Honda Pleasure and its battery has never been replaced since we purchased it in 2011. That is a full 8 years of service, which is quite amazing for a scooter battery. Anyway, we decided to replace it. Now, I have replaced car batteries a couple of times so far, but this would be the first time replacing a scooter battery. However, the instructions in the scooter manual for replacing the battery were surprisingly simple. So I thought there should be a post about it, because … why … Continue reading “How to Change Scooter Battery”

Main Door Project

A while ago, our home’s main door has been giving us a few problems. It has been about 8 years since we moved into our newly constructed house and seems like the maintenance work is now starting to creep up. The first sign of problems started when the door was sagging down at the hinges due to it’s own weight. Being the front door of the house, it is quite heavy, and the clearance between the door frame and the door was very small to start with. As the cycles of the weather took their toll on the door, it … Continue reading “Main Door Project”