SoundBar VU Meter Laminated Wooden Speaker

I felt that the battery powered Bluetooth speaker I made could be improved with more colour! Taking a leaf from the VU meters on amplifiers of the 80s, I decided it would be neat to sandwich clear acrylic between the plywood layers, each with an integrated LED that would form a full body amplitude meter.

Having a look around, I found a IC made by Texas instruments that did the VU meter job for me: the LM3915. Below is a photo series showing the construction and completed unit. I designed this version as a soundbar to sit below my monitors at work, so it doesn’t have a battery or Bluetooth, making the wiring easier inside and a slimmer unit. For this one I also used an Oak stain rather than a clear stain on the ply and filled the text with black acrylic, which looks much better I think.

Laser Cut Battery Powered Bluetooth Speaker

I wanted to create a special birthday present for my girlfriend, whom had no speaker system. I decided a battery powered Bluetooth speaker would be neat, and having just learnt use of the laser cutter I came up with a layered design.

I created a mock up in SketchUp, which I used to visualise the layers together and make sure it would work.
I create a mock up in SketchUp, which I used to visualise the layers together and make sure it would work.

The internals consist of a 2x15W RMS digital amp, 2x15W 80 cones, a Bluetooth module, 1800mAh NiMH battery and a basic fast charger – plus a few voltage regulators to bring everything together. It’s all wired so that you can charge while plugged in and still play, and turn the Bluetooth on and off. Finally it’s all insulated with sheep’s wool I had left from doing my van. I found the insulation helped reduce reverberation (probably due to the thin layers) that muddied the mid-ranges. One thing I like about it is that the front and back can be easily changed: the front grill pattern to change the look and the rear could be tuned to include a bass port for better bass response.

I fairly pleased with the result and might start producing them if there is enough interest.