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Nick: akeeh  Info
Age: 30
Location: Tampere

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Title: Blaster
Created: 28.08.2010 13:20

The display for the blaster is now finished, not much to do anymore. Next I'll have to find some red acrylic to go in front of the display to increase the contrast and to hide it. Also the top part of the blaster needs a proper lid and some  little things have to be done here and there.

Tech specs:
- Six 7x5 led matrix modules (gives a total resolution of 7x30)
- Five 74HC595D shift register chips to drive all the led modules, I only need 3 wires from the microcontroller to control the whole display

Old video with a test display (resolution only 7x17):
http://www.youtube.com/watch?v=VpbQddALv4o
The display for the ...
The display for the blaster is now finished, not much to do anymore. Next I'll have to find some red acrylic to go in front of the display to increase the contrast and to hide it. Also the top part of the blaster needs a proper lid and some  little things have to be done here and there.

Tech specs:
- Six 7x5 led matrix modules (gives a total resolution of 7x30)
- Five 74HC595D shift register chips to drive all the led modules, I only need 3 wires from the microcontroller to control the whole display

Old video with a test display (resolution only 7x17):
http://www.youtube.com/watch?v=VpbQddALv4o
The display for the ...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Blaster project, most of the work was done mainly last week. There are some things left to be done with the control panel (on top of the box) as it needs a lid and electic work needs to be done better.

Specs at the moment:
- 41 cm wide * 15 cm deep * 23 cm high
- Frame made from 6.5 mm plywood with some weight reducing routings, some pieces made from 4mm plywood
- Front aluminum is 0.7 mm thick and side aluminum panels around 1.5 mm thick
- 2x Visaton BG17 drivers (6.5 inch, 93 dB/W)
- 2*15W TA2024 amplifier (might upgrade to 2*25W)
- 10x 2500 mAh AA cells (might add 2-4 more if amplifier upgrades to 2*25W)
- Built-in MP3/WMA player with USB port and an SD/SDHC/MMC card slot
- Self made preamplifier and microcontroller (monitors battery voltage and controls the display etc) board
- Will have a 15 cm * 8 cm * 3 cm space under the top lid for an external music source (phone, MP3 player...)
- Will have a 7*30 dot LED matrix display on the front after I get the control pcb done
Blaster project, mos...
Video: http://www.youtube.com/watch?v=VpbQddALv4o

Control board for my blaster project. The board that has an ATmega8L and a double opamp for preamplifying the input signal to two different places (ATmega's ADC input and an output for the power amp).

The microcontroller is mainly used for visualizations and other stuff and it uses ADC to measure battery voltage, volume (position of the potentiometer) and audio signal. So far there are few different options for the display: Game of Life with timed steps, Game of Life with stepping by a amplitude treshold and it also spawns gliders on a spesific amplitude level to keep the show going. Other modes are audio wave, amplitude bar, volume level and battery voltage.

For testing I used an LED belt buckle (7x17 leds) and the final display will have six 8x8 LED matrix modules (8x48 leds) for a bigger display.
Video: http://www.yo...
The preamplifier and microcontroller board for my blaster. I did this board about two months ago and now I remembered to upload a photo here.

http://allthemods.com/userinfo.php?userid=10&id=7019

At the moment it only functions as a preamplifier in the temporary miniblaster but in the final blaster the microcontroller part will handle some visualization, battery voltage measuring and some other stuff.

The solder kinda looks messy, but every random looking solder spot is a via between the top and bottom side of the board to connect the ground layers together. Also the area of the operation amplifier looks messy but there are a bunch of SMD resistors and caps around it but they are hard to see from the photo.

Left photo: on the top of the board is the 5V voltage regulator, on the left side there is an Atmel ATmega8L and on the right a random dual operation amplifier to amplify the input signal with two different adjustable gains. The other line goes to the power amplifier and the other goes to an ADC input of the microcontroller so I can sample the signal and then use that data to do some visualizations.

Right photo: left corner of the board has breakout pins from the AVR, on the bottom is the 7-12V input and next to it the signal input. Close to the power amp board are two variable resistors to adjust the gain of the two lines and on the top is the preamplified output that is connected to the input of the power amp. On the center of the board are the pins for a volume adjust potentiometer.

Schematics:
http://akikorhonen.org/varasto/blaster/blaster_control_20100410_1_sch.png

PCB layout:
http://akikorhonen.org/varasto/blaster/blaster_control_20100410_1_brd.png
The preamplifier and...
I bought a "barebone" MP3 player from eBay (search for "MP3 WMA hardware decoder") that has an SD card slot and an USB connector for USB memory sticks. It also came with a remote control.

Almost two months ago I built a small temporary (until I get a better driver and figure out all the details for the enclosure) blaster from an old studio monitor that has been lying around for few years.

The miniblaster is powered with a TA2024 2x15W amplifier (http://allthemods.com/userinfo.php?userid=10&id=6727) and 10x AA cells.

The self made PCB has a small preamplifier that amplifies the signal for two purposes: for the power amplifier and the other signal line goes to a microcontroller that I'll use in the final blaster for some visualization etc. More info about it here:
http://allthemods.com/userinfo.php?userid=10&id=7020

The electronics and batteries are going back inside the case, this is just a test setup as I was testing out the MP3 player.
I bought a "bar...
2x15W TA2024 amplifier arrived in the mail finally. It'll be the amp for my upcoming blaster project. I'm not sure yet what speaker I'll use, but one option is 4" Tandband so the size of the blaster should stay small.

I will most likely power it with 10xAA cells and I might test out some step-up DC-DC converters to power the whole thing from only 4xAA cells. I'll have to run some test whether it's a good idea or not.
2x15W TA2024 amplifi...