I was working on an old car CD player, and before I even started, I had already removed some parts. It felt pointless to do anything without the right components. While going through the power circuit diagram, I noticed that one of the original parts looked very similar to the CD backshell. That gave me a little excitement, though I couldn’t remember the exact model. I rummaged through the pile and finally found what I needed. Among all the components, the most powerful one was the TDA7384, with 25 pins.
The first impression was confusing and complicated. I decided to look up the circuit diagram to get a better understanding.
After two nights of work, I was still stuck and it was almost morning. I gave up for a while and lay down. The only thing I regretted was not having a 2N3904 transistor. I searched every corner of my house, but it was nowhere to be found. In the end, there was nothing wrong with the setup. Even if it didn't work at first, I learned a lot. Success was just around the corner, but the lack of a proper PCB forced me to use wires, which made everything look messy. It wasn't perfect, but it was functional!
Despite the mess, the soldering turned out well. The high current caused the TDA7384 to heat up, so I added a CPU heatsink to keep it cool. No fans were needed—just kidding! I used resistors but forgot to note their values, which made things a bit unclear compared to capacitors. Fortunately, I had read about this in an old book. You should also pay attention to the color bands on the resistor’s surface, as they indicate the resistance value in a coded way.
There were also issues with parallel capacitors, identifying the triode tube, and making sure the ground connections were solid. During the process, I discovered something interesting: the bass problem of the speaker. To enhance the bass, I simply created a chamber behind the paper cone with a 3cm diameter hole. I made two holes on both sides to allow air flow, and added tubes to each. Everyone should try this—it's amazing how much you can improve sound quality with simple DIY solutions.
You'll find lots of interesting and surprising things when you start building and experimenting. Focus on solving problems, and you'll experience the thrill of discovery that isn't always obvious at first. It's a rewarding journey full of learning and creativity.
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Shenyang Tiantong Electricity Co., Ltd. , https://www.ttradiator.com