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== Tour ==
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{{bloc-etroit|text=We'll go over each pin on the board in the next page, right now let's look at the basic elements of the Sound Board so you have an idea of what each piece does.}}
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{{ADFImage|ADAFRUIT-AUDIO-FX-Tour-01.jpg}}
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{{bloc-etroit|text=Starting from the left is the micro USB jack. You'll need a standard MicroUSB cable to connect this to your computer. You do need a computer (any will do) in order to save files onto the Sound Board flash storage}}
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{{ADFImage|ADAFRUIT-AUDIO-FX-Tour-02.jpg}}
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{{bloc-etroit|text=This big chip is the audio decoding engine. It has OGG and WAV decoding capability and can listen to the trigger pins to know when to play each file. It has great audio quality, much better than trying to have a microcontroller generate the audio on its own.
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It cannot decode MP3 files - but that makes it a lot less expensive since MP3 decoding requires a patent license where as OGG and WAV are free for any kind of use.}}
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{{ADFImage|ADAFRUIT-AUDIO-FX-Tour-03.jpg}}
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{{bloc-etroit|text=This is the onboard flash chip. It's basically like a little SD card, but soldered directly onto the PCB. These chips can store a few megabytes. This doesn't seem like much but for most audio effects, you don't need hours of music. You can store a couple minute's worth of compressed OGG on a 2M flash chip.}}
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== Sortie casque ==
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{{ADFImage|ADAFRUIT-AUDIO-FX-Tour-10.jpg}}
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All the way to the right is the headphone jack. This is for connecting to a pair of headphones or into a powered speaker. It cannot drive an 8 ohm or 4 ohm speaker. Instead, an amplifier will have to be used (basically, just like your phone or pocket MP3 player needs an external powered/amplified speaker)
 +
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The outputs are 'live level' (about 1Vpp) and have DC blocking capacitors so it can be connected to any kind of amplifier.
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== Sortie amplifiée ==
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{{ADFImage|ADAFRUIT-AUDIO-FX-Tour-20.jpg}}
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All the way to the right is the Class D stereo amplifier. This is for connecting to a pair of speaker! The outputs are bridge-tied-load (BTL) so do not connect R+ to L+ and R- to L- to get more power, it could damage the chip. If you only need one speaker, simply connect the channel you want.
 +
 +
The amplifier can drive 8 ohm or 4 ohm speaker, up to 2.8W (10% distortion, 4 ohm) and 2.2W (1% distortion, 4 ohm)
 +
 +
4 ohm speakers will be louder than 8 ohm
 +
 +
Powering from 5V will be louder than 3V, so if you need more oomph, you can power from 4 x AA rechargeable batteries, or 3 x AA Alkaline, or a USB battery pack. It's pretty damn loud tho!
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{{ADAFRUIT-AUDIO-FX-TRAILER}}
 
{{ADAFRUIT-AUDIO-FX-TRAILER}}

Version du 29 décembre 2015 à 15:09


MCHobby investit du temps et de l'argent dans la réalisation de traduction et/ou documentation. C'est un travail long et fastidieux réalisé dans l'esprit Open-Source... donc gratuit et librement accessible.
SI vous aimez nos traductions et documentations ALORS aidez nous à en produire plus en achetant vos produits chez MCHobby.
En cours de traduction/élaboration.

Tour

We'll go over each pin on the board in the next page, right now let's look at the basic elements of the Sound Board so you have an idea of what each piece does.

{{{2}}}
Crédit: AdaFruit Industries www.adafruit.com

Starting from the left is the micro USB jack. You'll need a standard MicroUSB cable to connect this to your computer. You do need a computer (any will do) in order to save files onto the Sound Board flash storage

{{{2}}}
Crédit: AdaFruit Industries www.adafruit.com

This big chip is the audio decoding engine. It has OGG and WAV decoding capability and can listen to the trigger pins to know when to play each file. It has great audio quality, much better than trying to have a microcontroller generate the audio on its own.

It cannot decode MP3 files - but that makes it a lot less expensive since MP3 decoding requires a patent license where as OGG and WAV are free for any kind of use.

{{{2}}}
Crédit: AdaFruit Industries www.adafruit.com

This is the onboard flash chip. It's basically like a little SD card, but soldered directly onto the PCB. These chips can store a few megabytes. This doesn't seem like much but for most audio effects, you don't need hours of music. You can store a couple minute's worth of compressed OGG on a 2M flash chip.

Sortie casque

{{{2}}}
Crédit: AdaFruit Industries www.adafruit.com

All the way to the right is the headphone jack. This is for connecting to a pair of headphones or into a powered speaker. It cannot drive an 8 ohm or 4 ohm speaker. Instead, an amplifier will have to be used (basically, just like your phone or pocket MP3 player needs an external powered/amplified speaker)

The outputs are 'live level' (about 1Vpp) and have DC blocking capacitors so it can be connected to any kind of amplifier.

Sortie amplifiée

{{{2}}}
Crédit: AdaFruit Industries www.adafruit.com

All the way to the right is the Class D stereo amplifier. This is for connecting to a pair of speaker! The outputs are bridge-tied-load (BTL) so do not connect R+ to L+ and R- to L- to get more power, it could damage the chip. If you only need one speaker, simply connect the channel you want.

The amplifier can drive 8 ohm or 4 ohm speaker, up to 2.8W (10% distortion, 4 ohm) and 2.2W (1% distortion, 4 ohm)

4 ohm speakers will be louder than 8 ohm

Powering from 5V will be louder than 3V, so if you need more oomph, you can power from 4 x AA rechargeable batteries, or 3 x AA Alkaline, or a USB battery pack. It's pretty damn loud tho!


Source: Adafruit Audio FX Sound board Crédit: AdaFruit Industries

Créé par Ladyada pour AdaFruit Industries.
Traduit par Meurisse D. pour MCHobby.

Toute référence, mention ou extrait de cette traduction doit être explicitement accompagné du texte suivant : «  Traduction par MCHobby (www.MCHobby.be) - Vente de kit et composants » avec un lien vers la source (donc cette page) et ce quelque soit le média utilisé.

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Traduit avec l'autorisation d'AdaFruit Industries - Translated with the permission from Adafruit Industries - www.adafruit.com

Récupérée de « https://wiki.mchobby.be/index.php?title=ADAFRUIT-AUDIO-FX-Tour&oldid=17115 »