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⚠ Caution: You may harm yourself, get burns, electric shocks, if you don't know how to do soldering or by your carelessness.

Hi, fellows..... We hope all of you're familiar with bluetooh technology as its a short-range (typically less than 10 m) wireless technology standard used for exchanging data between fixed and mobile devices over short distance using UHF radio waves in the ISM bands, from 2.402 GHz to 2.48 GHz, and building peronal area networks (PANs). It was introduced on 7th May 1989, more info.

Before we go ahead it would be better to know the features of this DIY Project (Bluetooth Audio). Well its depend on us that how we utilise it and for which work, fair or unfair.... Ahh! you heard right. Here, we suppose to use it for fair use.

Features of this Bluetooth Audio project:

• To listen audio (by earphone or headphone).
• To listen audio on non bluetooth device like audio system, amplifier, home theater, speaker, PC speaker, etc.
• Use as bluetooth mic or wireless mic (microphone).
• Use as bluetooth remote or wireless remote.
• Use as audio source in other DIY Projects to control robots, using DTMF decoder.
• Can be use as bluetooth spy. (spying is not fair use. So, we won't discuss about it anymore.)

We konw a bit about bluetooth that, its something which is use to exchange data wirelessly within or upto 10 m and features of this DIY Project. So, we can go ahead to build up this Bluetooth Audio project. Basically, we need three things which can be of any size: cover; BT circuit board and battery. Well it depends on various purpose like for which application we're making this BT Audio, for example if we're making it for other DIY Project to control robot using DTMF, we will have to take care of size, weight, power backup, etc. while if we're making it for common use we will have to think about nothing except power backup. Keeping these things in mind chose your cover, BT circuit board and battery. Here, we had used refreshing mint's box; old used out generic BT earphone's BT circuit board and 3.7 v cylindrical re-chargeable battery.

• Bluetooth earphone
• Bluetooth circuit board - front
• Bluetooth circuit board - back
• Searching bluetooth device
• Searching bluetooth device
• On charge

• Box for covering/casing.
• BT circuir board
• 3.7 v Battery
• 3.5 mm audio port for audio out.
• Push button
• Wire (go with earphone wire as its thin, light weight and saves lots of space.)
• Hard glue (go with fevikwik.)

• Battery +ve
• Battery -ve
• 3.5 mm audio port - back
• 3.5 mm audio port - front
• Micro push button - front
• Micro push button - front

In this DIY Project we had made Bluetooth Audio from used out BT earphone or headphone. However, It doesn't sounds anything new. Yeah, you're right by your side. We had just replace old battery with new one for extended power backup and did some modification on bluetooth circuit board like removed micro push button from it, soldered up power ON/OFF wire and replaced blue LED with white LED, in order to did these things, we had soldered up the crystal oscillator at new place.

Bluetooth circuit board after modification - front


Bluetooth circuit board after modification - back

Tap to play.......

YouTube > Make Bluetooth Audio From Bluetooth Earphone - HS infoaid

After Completion, we must say, we had great fun to did it. Its seems to too easy to do it.... Yeah, it is.... Before we had started we too had confusions, finally we end up with it. Talking about its size, its enough for using in average DIY Projects and just for listening audios. You would be surprised to find out that its power backup is and upto 15 hours, as we have tested. (used for around 2 to 2:30 hours everyday for one week.)

• Compact and portable (hight: 5.8 cm and radius: 1.1 cm - depends on casing.)
• Power backup: upto 15 hours. (depends on battery.)

For soldering you also need soldering iron, soldering wire, soldering paste (flux) and wire cutter. We assume that you know how to do soldering.

Note: While doing soldering be carefull...! Don't short circuit the battery terminals and BT circuit board otherwise it will be of no use.

Posted on: 13 June 2021

If you stuck on any step just ask from us via your comments below.