XLR preamplifier
A balanced preamplifier based on the Audio Injector Analogue Breakout Standard v1 (AI-ABS v1)
https://github.com/Audio-Injector/AudioInjector-Analogue-Breakout-Standard
https://www.audioinjector.net/xlr-preamp
https://shop.audioinjector.net/detail/Sound_Cards/Balanced+XLR+preamplifier
Check the single ended (RCA) preamplifier here : https://github.com/Audio-Injector/RCA.preamplifier.AI-ABSv1