DIY Budget Bluetooth Speaker + FM Radio
by playery54 in Circuits > Electronics
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DIY Budget Bluetooth Speaker + FM Radio

I have made a DIY Bluetooth Speaker that also has an FM Radio built in, I wanted a cheap speaker for my room but couldn't find one, so I made one instead.
Supplies

- Soldering Iron
- Solder Wire
- 3.7 Volt 800mah Rechargeable Li-ion battery (I had it lying around)
- Helping Hands (trust me it helps a lot)
- 3x wires with JST 2-pin connector at one end (comes with main module)
- 2x 3Watt Speaker (The ones I used are discontinued but this should work: Link
- Main Board Amplifier Module: Link
OPTIONAL:
- A length of copper wire (for the antenna) - This improves signal reception and works great.
- Crimping Tool (Very useful for taking ends off of wires)
- RGB LED Strip (Included with main board)
Crimp the Speaker Wires



Grab your soldering Iron, solder wire, 2 out of 3 of the wires with connectors, the 2 speakers and your crimping tool. We need to crimp the ends of the wires to expose the fresh ends we will solder too.
Solder the Speaker Wires

Next we need the 2 speakers, and the 2 freshly crimped wires with connectors. We will solder them together, be mindful of the polarity of the speakers and wires (Remember: Positive = Red/+, Negative = Black/-).
Downloads
Crimp Battery Wires

Once Again, we need to crimp, but this time we will crimp the battery wire (the 3rd wire with connector).
Solder Battery Wires

We can now solder the battery wire to the battery itself, once again check for polarity on the wire and battery. If you want, you can use small cardboard pieces on either sides of the grips to stop the battery from being punctured.
Downloads
Crimp the Antenna

We will now crimp the end of the length of wire for the FM Antenna.
Solder the Antenna (OPTIONAL)

There is a Small Marking on either side of the board in the corner pointing to the "FM_ANTENNA", that is the solder point.
Connect It and Hope for the Best!!!


This is how you connect the wires and the photo of the diagram from the shopping page.
Connecting to It
You can connect to it by flipping the switch on the main board and waiting for the "boop-bop" sound. That puts it into Bluetooth mode, you can connect to it like any Bluetooth speaker, the buttons either side change the song and if you hold them, the volume. If you hold the middle button until you hear the same sound again, it is in radio mode, you can press the middle button when in this mode to search for stations or you can press the buttons either side to change stations. You can charge it with the built in USB-C port. A more detailed explanation is on the shopping page for the main board.