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Pascal Hibon
2013-05-23, 13:48
This is another update on my adventures with the Wandboard and the Community Squeeze. I have a first project (still ongoing) that is documented here: http://www.communitysqueeze.org/image_gallery.jsp#Pascal_Hibon

Due to the fact that the Community Squeeze is working great I got some ideas for two other projects for this player in my house. Both of these projects require a Squeezebox that will be mounted behind the sealing driving in-ceiling speakers through an amplifier which also resides behind the ceiling. The Community Squeezebox needs to switch the amplifier on and off based on the power state of the player. So there was a need for a bit of additional electronics and a custom Lua script. The Lua script is driving GPIO_19 on the Wandboard. GPIO_19 simply drives an SSR (Solid State Relays) which powers the amplifier on and off. Below are some pictures of the project:

I use a 3.5 mm stereo jack for the trigger output. The two resistors and the transistor are soldered around the jack connector:

http://img809.imageshack.us/img809/8435/triggeroutconn.jpg (http://imageshack.us/photo/my-images/809/triggeroutconn.jpg/)


This is how it connects to the Wandboard:

http://img59.imageshack.us/img59/9546/triggeroutboard.jpg (http://imageshack.us/photo/my-images/59/triggeroutboard.jpg/)



And here it is all assembled:

http://img441.imageshack.us/img441/3083/triggeroutwandboard.jpg (http://imageshack.us/photo/my-images/441/triggeroutwandboard.jpg/)

For those of you who are interested the schematic is attached. And I’ll post the Lua script and some documentation to install it in a later post. Maybe JackOfAll can put it all up on the Community Squeeze website.

kesey
2013-05-23, 14:02
nicely done, Pascal.

Pascal Hibon
2013-05-28, 12:21
My “in-ceiling” project is coming along quite nice. I’ve built the amplifier and power supply from bits I had laying around. The power supply might be a bit of overkill but it’s better to have one that is capable of delivering a bit more power than required… The amplifier is built around the TDA2040 chip http://www.datasheetcatalog.org/datasheet/stmicroelectronics/1460.pdf

In the picture below you see the amplifier’s power supply, the amplifier and the Wandboard.


http://imageshack.us/a/img43/2205/20130528communitysqueez.jpg


I finally chose to use a relays instead of an SSR (just because I still had the parts laying around for that). The power supply is mounted on a piece of wood and does not really require an enclosure. Once it sits behind the ceiling no one will notice that anymore…


http://img22.imageshack.us/img22/2205/20130528communitysqueez.jpg (http://imageshack.us/photo/my-images/22/20130528communitysqueez.jpg/)


Below is the schematic of the trigger driver electronics. The left part resides in the Wandboard enclosure and the right part resides on the amplifier’s power supply board. The relay simply switches the mains power to the transformer.


http://img547.imageshack.us/img547/9448/schematictriggerwrelais.jpg (http://imageshack.us/photo/my-images/547/schematictriggerwrelais.jpg/)


It is all tested and it works fine. Now I need to find the time to build all this in the bedroom ceiling. This system will replace my Squeezebox Radio I currently use there. The SBR will be used for portable applications such as the garden (it has a battery). For those of you who are interested, I’m using DC101 speakers from Artsound: http://artsound.be/en/products/loudspeakers/p/detail/dc101

Osamede
2013-05-30, 13:56
Cool stuff...

scrarfussi
2013-12-21, 06:09
excellent stuff really like your projects
i wanna build this
http://www.communitysqueeze.org/html/images/photos/wb_coax_circuit_diagram_pascal_hibon_577x385.jpg
please can you give me the values for the capacitors . Thank you

Pascal Hibon
2013-12-21, 08:00
excellent stuff really like your projects
i wanna build this
http://www.communitysqueeze.org/html/images/photos/wb_coax_circuit_diagram_pascal_hibon_577x385.jpg
please can you give me the values for the capacitors . Thank you

The values are indicated on the schematic. I'm in the process of finishing another project with the CS and I'll create a better looking schematic then.
You need two 150 nano F and one 100 nano F capacitor. The 100 n should be very close to IC1.

scrarfussi
2013-12-21, 08:53
thank you will build this soon
i really want coax out