Hey! This thing is still a Work in Progress. Files, instructions, and other stuff might change!

Mason Blaster

by ElectricSlim, published

Mason Blaster by ElectricSlim Jan 13, 2013

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Audio system in a jar!



This print allows you to attach a 2" speaker to a wide mouth mason jar and turn it into a mono speaker system.


The electronics and battery is mounted to the electronics plate. The plate slides into the bottom of the lid and rests in the grooves of the lid.

The audio system is based around a LM386 amplifier. The lighted jar is a single RGB led and controlled by an ATtiny85 microcontroller. The mason jar has been frosted to diffuse the light.

For the next iteration, I want to explore using FFT to create music based light displays.

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I am having trouble understanding the schematic. It says "Vin" which means "Voltage in?" However, I thought that the voltage goes in from a 9V battery? I have soldered together some simple stuff from schematics I found on the internet before, but I am not an electrical engineer. Please explain. Thanks ;0)

Vin in is the audio signal coming from whatever device you are using. It is connected to the one of the input of a 1/8" stereo jack. I think Vin is unintuitive as well, but I wanted to make sure I used the same labels as the datasheet.

I haven't gotten around to getting the LEDs to respond to the music. If you look into a Color Organ circuit, it would be the easiest way to achieve this.

Very Cool! Looking forward to more details.