Multi Channel Whole Home Amplifier (piCorePlayer w/TPA3118 Mono Amps)

thingiverse

<h3>Whole Home Audio Amplifier utilizing piCorePlayer and up to 10 TPA3118 50w Mono Amplifiers.</h3> I created this whole home audio setup using a Pi 3B with piCorePlayer, which operates 4 (Sqeezelite) stereo modes or up to 8 mono zones, along with Logitech Media Server. The unit is designed for a MEAN WELL LRS-350-24 power supply as it is the back of the unit and TPA3118 mono amplifier boards. I plan on creating an expansion unit in the future to add more cards off the same Mean Well power supply and Pi. <h3>Printing</h3> The images of my assembled unit have some slight differences from the STL files that are included as I upgraded small flaws that I overlooked in my design. These designs are all oriented to be printed with NO SUPPORTS. I printed my whole unit at 0.25 layers and 10% infill on PrusaSlicer 2.0. The only clean up needed is to remove the 80mm fan plug inside the case for airflow. All the screw holes are meant to be self-threaded by the screws, so I recommend printing the Top Cover (to test M4 holes) and an Amplifier Holder (to test M3 holes) first. <h3>Wiring</h3> The above image shows how a PC817 or EL817 opto isolator is connected to the Pi to activate the mute circuit of a amplifier. This circuit will be used for each amplifier. The 4.7k ohm resistor is a pull-up resistor to activate the mute as soon as the Pi receives power. The Pi must pull the GPIO low to mute the amplifier. <h3>Components</h3> Here are the components needed for this project: * Pi 3B with piCorePlayer * MEAN WELL LRS-350-24 power supply * 5v/2Amp Switching Power Supply * Angle Micro USB Male Plug Socket Connector * AC Power Socket With Switch & Fuse & Lamp, Chassis / Panel Mount D4F6 * AC Power Cord * USB External 7.1 Channel Audio Adapter (like Vantec NBA-200U) * 80mm x 10mm 5v DC fan (Not required.) * Misc. wiring depending on configuration. <h3>Amplifiers</h3> Here are the components needed for the amplifiers: * 1 to 10 - DC 12V-24V TPA3118 BTL 60W Mono Digital Audio Power Amplifier Board Module(s) * 1 to 10 - RCA Female Jack Socket Red/Black Chassis Panel Mount Connector(s) * 1 to 10 - Terminal Binding Post(s) (Power Amplifier Dual 2-way Banana Plug Jack B8A7) * 1 to 10 - PC817 or EL817(s) * 1 to 10 - 4.7K Ohm Resistor(s) * 1 to 2 - 50 x 70mm/1.97" x 2.76" or 30 x 70mm/1.18 x 2.76" Prototype PCB Board(s) (Depends on your circuit organization.) <h3>Screws</h3> Here are the screws needed for this project: * 4 - M2.5x5mm (for mounting Pi) * Alot - [M3 x 5mm Pan head Screws for Motherboards](https://www.ebay.com/itm/100-pcs-M3-x-5mm-Phillips-Pan-Head-Screw-for-2-5-HDD-SSD-DVD-ROM-Motherboard/200967495269?ssPageName=STRK%3AMEBIDX%3AIT&_trksid=p2060353.m2749.l2649) * 4 - M3x12mm or 14mm (for fan if wanted) * 10 - M4x6mm * 7 - M4x8mm * 8 - M4x10mm