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RPI Player and Amplifier IntroductionSad because my 7.
1 receiver broke down and get a repair offer pricier than a new High end receiver. my first decision was to scrap and recycle it. But looking at that that case full of electronic garbage, looking to a spare Raspberry PI 2 some thoughts started to fly around my head and MyPIAmp project started to take shape. I would need to get a cheap class D amplifier, reuse whatever I can from what inside that case and build my own cheap and customized Stereo System. after all I just need 2 channels to listen my music in my backyard where I don't have any audio system there.0. Music player, capable of reproduce high end sampling rate, let's say, up to 24bits/192Khz. this means that I dont want to be limited on the source: "capable of reproduce DVD Audio, some LPCM DVD tracks, BD ROM (Blu ray Disc) audio tracks, and HD DVD (High Definition DVD) audio tracks, High Definition audio recording devices and audio editing software. This sampling frequency is four times the 48 kHz standard commonly used with audio on professional video equipment." View sourceHeadless and autonomous System Meaning that it should operate without Monitor and keyboard and without network connection. silver bracelet pandora To achieve that I need to add a capable storage that is capable to mirror my Music Database when network connected and a control system diamond ring pandora charm that enables minimal operation without Volumio interface that is network powered (http client) Built in amplifier with Line Out and Speaker Out option to connect to 2nd Amplifier system Analog audio input for Mobile devices or MP3 / CD pandora bangle players connection and reproduction USB input for keyboard (emergencies console login without open the box) and USB dongles with Audio files to play. HDMI Output for emergency console and future Media player? ON/OFF switch to cut of power (No neet do perform Raspberry pi shutdown. It must handle that : ) Ethernet port for wired lan connection [OPTIONAL] WIFI dongle for wireless lan connection (this is optional as I don't want to add delay on Raspberry boot times) Step 1: The High Level Project based on the requirements I've buiil a schematic of what needs to be done and made my hardware/software selection : RPI with Volumio as it is light and simple. no aquisitons need to be done DAC with IR receiver to be able to control the system with a IR remote control and comply with requirements to be aquired 2x16 Character LCD for headless system control interface. Need USB interface as I dont want to solder anything on top of DAC to be aquired Remote control Reused one from apple TV that is barely used. Class D amplifier to be aqquired Input switch Reuse a broken one with four inputs. Use the 3P4T switch with custom cabling and the power unit to power 4 status leds. Add extra led for power on signal. no aquisition needed On/Off Switch Reuse some 220AC with red button power switches that I have available No aquisition needed. 250Gb USB Hard disk No need to aqquire USB powered hub No need to be aqquired WIFI dongle Available Ethernet extension cable to connect RPI to back panel Available HDMI extension cable to connect RPI to back panel need to aqquire 2 Power transformers 1x12Vdc 1x5Vdc 2 AC plugs electrical cable for AC power wires from old UTP cable for internal connections Some custom adaptations to mount the input switch in the case and volume control from a D shape's to 6mm knobs. and with that a List of materials was defined:1. Raspberry PI 2 RevB2. Raspberry pi B+ 2B HIFI DAC + Audio Sound Card I2S Interface Special PCM51223. TPA3116D2 Class D Digital Stereo Amplifier Board 50W+50W 12 24V Dual Channel Car4. Audio Input signal Selector Relay Board / Signal Switching Amplifier Board+ RCA (Broken. Used only for Powering the leds and the custom wired 3p4T selector)5. Apple TV Remote6. Box and some reused components of a broken Pioneer VSX 920 K 7.1 receiver 7. Adafruit USB + Serial Backpack Kit with 16x2 RGB backlight negative LCD8. pandora jewellry 12V DC power transformer9. 5V 2.5A power transformer10. USB powered hub11. Other small parts and accessories After defining and collecting all the hardware pieces, it came the time to put everything together. first of all, and based on High Level Plan, I've defined the input selector part, just for understanding how to wire the 3P4T selector. I've wired Right and Left Channel and the 12VDC. For the first 2 same ground was shared and for 12VDC the reference was also shared.
The 3P4T selector color scheme is the same as wires used. After that I've draw the overall schematic and build the system based on that. Some pictures highlight some of the adaptations done.
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