DIY Bluetooth Speaker
Ever cranked up your phone’s speaker during a beach BBQ, only to hear tinny echoes drowned by waves? We’ve all chased that perfect portable boombox without dropping $100 on JBL. Enter this genius DIY Bluetooth speaker circuit—using a cheap module and amp for crystal-clear sound under 12V. With the diagram and PCB files, it’s weekend warrior-approved. Let’s build vibes that last, for under ₹1,500!
The Heart of the Build: Key Components
- Bluetooth Module (TDJA1517F/YNG603269): The brain—pairs wirelessly up to 10m, decodes audio from your phone. Handles stereo output, low power (5V via USB or adapter).
- TDA1517 Amp IC: Powers two 4-6Ω speakers with 2x6W stereo punch at 12V. Class-B efficiency means no overheating during dance-offs.
- Treble & Bass Pots (10kΩ): Dual potentiometers tweak highs for crisp vocals and lows for thumping bass—customize like a pro DJ.
- Speakers: Dual 3-5W full-range drivers (e.g., 2” neodymium) for balanced sound.
- Power: 12V DC input (wall adapter or Li-ion pack for portability). Add a switch for on/off magic.
Total cost? $10-15 on AliExpress—grab the module (~₹300), amp (~₹100), and pots/speakers (~₹500).
Wiring It Up: Step-by-Step (No PhD Needed)
- Prep PCB: Download Gerber files (search “TDA1517 Bluetooth PCB” on EasyEDA) or etch your own. Solder the module’s audio outs (L/R/GND) to amp inputs.
- Connect Amp: Wire module’s left/right to TDA1517 pins 1/18 (inverting/non-inverting). Pots inline for tone control—treble on high-freq path, bass on low.
- Speakers & Power: Amp outputs (pins 7/10) to speakers via caps (1000µF) for DC block. +12V to pin 9, GND to 8. Bluetooth VCC/GND to 5V regulator from 12V.
- Test & Enclose: Pair via Bluetooth, play a playlist. Box in 3D-printed or plywood case for that custom enclosure flex.
Pro tip: Add a 1000µF cap on power for ripple-free audio. Troubleshooting? Check solder joints—loose wires kill the party.
This setup delivers 80dB SPL—loud enough for small rooms or picnics. Upgrade with EQ app integration for next-level tweaks.
Snag parts: AliExpress TDA1517 kit (aliexpress.com/item/1005006449323217.html). Tutorials: YouTube “TDA1517 Bluetooth Speaker” (youtube.com/watch?v=vP6Q2UNV7SQ). PCB designs: ElectronicsForU (electronicsforu.com).
Your garage band’s new bestie? Build it and tag us—sound off below!