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Thread: DIY 50W Class D Busking Amp for $10

  1. #1

    DIY 50W Class D Busking Amp for $10

    My first project was converting a 15W Artec A15C here, which I accidentally destroyed the speaker after a few months...

    My second project was converting a 200W Lunchbox Acoustic here which is still up and running well. However, I desired a more efficient and lighter setup and I realised I usually don't need so much power. I also wanted to spend $10.

    Most acoustic amps are class AB, which are 50-70% efficient. Class D amplifiers are about 90% efficient, which sounded like what I wanted! Hence I opted for a Class D design, reusing the cabinet from the Artec Amp for this third project. Some may have heard (pun intended) that Class D introduces distortion. However, after listening to online reviews and playing with the finished product, I couldn't tell any consistent difference between Class D and Class AB.

    Let's dive into the design.

    For the amplifier itself, I opted for this TPA3116D2 (50W + 50W) board on Lazada, costing only $6!

    For the power supply, I went for this trusty "150W" unit for only $3.50, which allows a supply voltage from 10V to 24V (allowing you to run it off a laptop mains adaptor if you're indoors)

    For the 6.5" speaker, I'd already used up my $10 budget. So I went to the neighbourhood car audio shop and asked if they had any used speakers to give away. Amazingly, I got a Rainbow KX165 coaxial speaker for free!

    In theory, all these components should play nice and work together. Will update once I've assembled it together!

  2. #2

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    Re: DIY 50W Class D Busking Amp for $10

    Very interesting! Do keep the updates coming!

  3. #3

    Re: DIY 50W Class D Busking Amp for $10

    It's taken me a while, but I've done it (for a bit more than $10!)

    Details can be found here:

    Hope this helps anyone interesting in making their own busking amp!

  4. #4

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    Re: DIY 50W Class D Busking Amp for $10

    Hi Victor,
    Looking for my first busking amp. Do you have any still available?

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