sdiwen Posted Monday at 06:31 AM Posted Monday at 06:31 AM Project Inspiration Recently, I cleaned up the drawer and found a bunch of discarded 5V mobile phone charger boxes (that is the kind with plastic shell and USB port). I had a sudden idea: The size of this thing can be stuffed into a 40mm full-frequency speaker, so why not transform it into a pair of retro industrial-style desktop speakers? The actual sound quality is actually a hit on Taobao’s 100-yuan product! Bill of materials (total cost ≈50 yuan) Core waste: mobile phone charger box x2 Speaker unit: 40mm 4Ω full-range speaker x2 Soul Accessories 3.5mm audio socket x2 (with nut fixation, anti-pull) Hot melt glue gun + glue stick (fixed horn artifact) Electrician tape/waste jeans (made of damping layer) Tool Requirements Electric drill + 6mm drill bit (audio hole opening) Scissors + screwdriver Soldering iron (for soldering wire, you can use terminals if you don’t have it) Production steps 1. Remove the shell and dig holes Pry open the charger housing and keep the internal circuit board as counterweight (prevent resonance) Use an electric drill to drill a honeycomb diffusion hole (see Figure 1) on the front, and open a 3.5mm socket hole on the back 2. Metaphysical Tuning Jeans fabric on the inner wall (reduces plastic cavity resonance) Use hot melt adhesive to fix the horn at an angle of 45° (the sound field is wider) 3. Wiring operation Positive electrode welding audio socket middle contact, negative electrode connection housing (mono mode) Test: Play the prelude of "Hotel California" directly on your phone, and listen to whether there is any noise when you put your ears on it. Listen to the report Low frequency: Unexpected dive (charging case resonance bonus) Voice: It feels very close to the face, suitable for listening to podcasts/ASMR Hidden skills: USB port is transformed into LED ambient light (connected to 5V light strip), a magic tool for disco-doing desktop Car overturn warning Don't use fast charger! The shell is too thin and resonates easily Don’t be greedy for loudspeakers! Actually measured that the 50mm unit will become a "bathroom singing effect" Single dogs are careful to play: Neighbors think you are doing electric drill performance art What is the most outrageous "waste-transformed audio equipment" you have tried? (I have seen foreigners use coconut shells as headphone shells...) If you add a Bluetooth module, can this thing be sold for 99 free shipping? Advanced magical change direction String a 47uF capacitor for high-pass filtering Magnetic paint on the shell, star war sticker Stack three boxes to change to 2.1 channel (subwoofer? It doesn't exist, it's a shock massager!) Why choose this project? Zero cost + 1 hour completion, novices friendly Perfectly solve the ultimate contradiction of "I can't bear to throw away garbage and not enough houses" Have metaphysical problems when doing it? Reply to me and let me get in trouble online!
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