Speaker Block Amp with Pam8403 Enclosure

thingiverse

Here is my Speaker connector block with integrated PAM8403 amplifier which runs off 5V USB power. The goal is to get the smallest 8 Ohm speaker amplifier using standard components. Both the PAM8403 and connector block are available on Ebay. I sourced the USB cable and 3.5mm plug from scrap cables. The pinout of the PAM8403 PCB can be found for wiring purposes. I needed two coarse threaded countersink screws to assemble this project. If you require an M3 version, simply change the model number. There is a feature that allows moving the cable holes to the center rear - see the openscad file for more information. Note: When powering the PAM8403 from a phone battery charger (as shown in the image), the power can drop out. I believe this issue is related to minimum load on the battery unit, as it works intermittently.