This is a freshly released DIY headphone amp so I'm trying to spread the love outside of DIYAudio. I have no vested interest other than spreading the word on a new amp to build. Wayne Colburn of Pass Labs was kind enough to create and share the WHAMMY DIY headphone amp circuit , standing for Wayne' Headphone Amplifier Must Make Yourself. It's a simple build, no need to match parts / make adjustments, so it's perfect for the budding DIY builder. It's also inexpensive. The PCB, parts and chassis should be under $200 without much effort. Jim Tiemann aka 6L6 of DIYAudio has been kind enough to coordinate the project and has been instrumental in making it accessible. You can read more about the project here: http://www.diyaudio.com/forums/pass-labs/317803-whammy-pass-diy-headphone-amp-guide.html Boards can be procured here: https://diyaudiostore.com/collections/printed-circuit-boards/products/whammy And you can learn more about the circuit design here: I'll be building one myself and will document within this thread. If you need assistance approaching the build or have questions, feel free to reach out. I'll do my best to help.