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DIY Bluetooth Speaker: Upgrade Old Computer Speakers
If you are interested in DIY Bluetooth speakers, you may want to take a look at this article.
If you happen to have an unused computer speaker and you are unsure what to do with it, and you feel it is a pity to throw it away, you can come up with the idea of converting it into a Bluetooth speaker.
This 2.1 computer speaker subwoofer uses an SJ2038 amplifier chip inside, and it delivers 3.5W output power, which is relatively low.
If you happen to have a higher-power Bluetooth amplifier board,
Although it is rated at 8.5W × 2, it only requires a 3.5–4.2V power supply.
The battery protection board should be at least 5A to ensure it will not reboot automatically at high volume.
If you do not want to damage the original cover, you can replace it with a piece of plywood.
If you think it does not look good, you can apply a layer of stickers to improve its appearance.
You use a total of three speakers, where the tweeter and the full-range speaker are connected to the left channel.
The subwoofer is connected to the right channel, and the subwoofer needs to be connected in series with an inductor to filter out mid and high-frequency signals.
This inductor is also salvaged from a crossover network.
The tweeter is connected in series with a 3.3 µF capacitor.
The full-range speaker is 1.5 inches in size.
You use four 18650 batteries to form a 10,000 mAh battery pack, which provides sufficient runtime and handles high dynamic output without pressure.
However, this Bluetooth amplifier board is small in size but delivers high power.
It has a charging port and a power button at the back, and the charging port also supports USB sound card mode and allows EQ tuning.
A speaker box with a built-in subwoofer like this is far better than those that rely on passive bass radiators.
If you happen to have an empty snack box, such as a transparent square container,
you can cut holes in it and apply a decorative covering.
Installing a black mesh grille will make it look better, and then it is finished.
The lighting effect looks very good.
