Chris Judevine's Electronics Blog

  I had an old unpowered subwoofer originally it plugged into the speaker output from my stereo. Inside the sub there was a filter circuit, it ran through an inductor and into the 2 internal subwoofer speakers. There were 2 outputs that went though an RC filter and to these two mini speakers that came with the subwoofer. The mini speakers went missing and I just plugged in the 2 mid-range speakers that came with the stereo. The problem with this is that the subwoofers filter was tuned for the tiny speakers. The sound coming out of was flat since most of the frequencies it was expecting had been filtered out. I wanted to run the mid ranges directly from the stereo, but I also wanted some bass. So, I decided to get a cheap amp and run the subwoofer from the subwoofer output in my stereo. I purchased the Wooper D20 from aliexpress.us since it was cheap and because it was panel mount, so I could wire it up to my sub and it would look like it was always a powered ...

    I purchased an inexpensive mp3 player for when I was working and didn’t want my phone getting broken while listening to tunes. I was mildly annoyed that the text on the main menu was all squished together and did this odd scrolling thing. I looked to see if there was some way to modify it, I found some tools to do so, but they were not compiled. https://github.com/ilyakurdyukov/smartlink_flash I figured out how to get them working and managed to modify my main menu’s string table, and figured I’d document the process if anyone else wanted to try modding this thing.     Setup Install LibUSB Download site: https://zadig.akeo.ie/ Boot in Bootloader mode- On YP3 Turn off MP3, then hold Vol Button while connecting to PC Connect Device: Plug in your USB device and turn it on (if applicable). Run Zadig: Start the Zadig application. Select Device: In Zadig, go to Options and check List All Devices, then select ...