Posts in category "project" - page 8
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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.
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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).
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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 --
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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 do much about it.
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Tax Filler Script
The Indian tax filing has become even more tedious now. Going forward, starting from assessment year 2020-21 (financial year 2019-2020) one needs to report each and every equity redemption that results in long term capital gain in Schedule 112A. It used to be optional last year. Instead of reporting every transaction you could just report the aggregate value. But it is not optional anymore. This increases the burden on the tax payer especially if you have made a lot of small transactions.
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Building A Periscope With Cardboard
I think I can build a career making cardboard toys. Every time my daughter has an "idea" for a toy, I have get ready to build something out of cardboard. After the doll house, disk drop game and rolling ball machine, the latest idea from my daughter was to build a periscope. She probably saw some youtube video of some one building it.
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Rolling Ball Machine Construction
After building a doll house and disk drop board, my daughter had another idea for a cardboard project. This time she wanted to build a rolling ball machine. Again, as usual, I comply. I had no idea of what she had in mind. So I asked her to do a drawing and explain how the machine is supposed to work. She drew a spiral on paper, cut it out along the pencil drawing. Then, pointing at the dangling spiral, she said "that is what I want".
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Building A Disk Drop Game Board
In one of my previous posts, I was left wondering if toys have a place in unschooling. The argument was that the toys help develop creativity in the kid. On the other hand, why should we buy any toys if the kid is creative? They can build their own toys with nature. Well, I got a mild taste of the latter when my daughter proposed and help build a disk drop game board. For those unaware of a disk drop game, here is a picture of it.
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Drip Irrigation Control System v4.0 – Web Server
In the past, I explained the hardware and software parts of the system. This concluding post on my drip irrigation control system will go into the details of the web server. As you know, I wanted to build a system that I can control from anywhere. In the previous designed, I had to be near the control system to configure the drip time and duration using buttons on the board.
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Drip Irrigation Control System v4.0 – Software
This is a continuation of my previous post on control system v4.0. In that post I wrote about the hardware. Now I will talk about the software. If you have been following my drip irrigation control system design, you know that I switched from Arduino to ESP8266. It took some time for me learn about the new board, but it is very similar to Arduino when it comes to programming it.
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