This is a pcb, that was kindly provided by a user of my ESPuino. It makes use of a DAC named 'PCM5102A' with a TDA1308 as amp. PCM5102A supports I2S, so it can connected in parallel to MAX98357a to the I2S-pins BCLK, LRC and DIN. Of course, it needs 3.3V and GND, too. Please note that SMD-technique is used. <br/>
The 6th pin of connector J1 is used to indicate whether there's a plug or not. That means if there is a plug, this pin is pulled to GND and therefore can be used to connect to MAX98357.SD. Doing so will mute MAX's amp and vice versa. Of course you need a special [headphone jack](https://www.conrad.de/de/p/cliff-fcr1295-klinken-steckverbinder-3-5-mm-buchse-einbau-horizontal-polzahl-3-stereo-schwarz-1-st-705830.html) to use this feature. Additionaly this 6th pin can be connected to the ESP32 in order to make use of the feature `HEADPHONE_ADJUST_ENABLE`. Doing so can optionally limit the headphone's maximum volume (configureable via GUI). <br/>
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Please note: the files in my GitHub-repository may be outdated regarding this PCB. Please have a look [here](https://u.pcloud.link/publink/show?code=kZjJVKkZOYso9U99qILNOMm5ehliaFtxldWX).
I started this project back in october 2019 and never expected it to become that large. The project grew and grew - so did main.cpp. So it was about time to have it split into modules. This was done in march/april. After spending some time on tests, improvements and implementing new features, refactoring-branch will is NOW the new master whereas the previous master a new branch named `old`. It will be kept as reference but won't by maintained anymore. Please be advised that moving to refactoring-branch will re-arrange ESP32's partition. All things to know are described [here](https://forum.espuino.de/t/wechsel-zum-refactoring-branch-was-ist-zu-beachten/510) in german language. Development of the new master is documented [here](https://forum.espuino.de/t/refactoring/415). Have fun and don't hesitate to contact me in case of problems/questions.
## Forum
* EN: I've set up a primarily German-speaking community with much documentation. Also an international corner for non-German-speakers is available at https://forum.espuino.de. Github-Login can be used there but it's not mandatory.
* DE: Ich habe ein primär deutschsprachiges Forum aufgesetzt, welches ich mit reichlich Doku versehen habe. Würde mich freuen, euch dort zu sehen: https://forum.espuino.de. Ihr könnt euch dort mit eurem Github-Login einloggen, jedoch auch "normal" anmelden. Dokumenation findet ihr insbesondere hier: https://forum.espuino.de/c/dokumentation/anleitungen/10
Torsten Stauder
4 years ago