The PPA Project
The PPA Project was a collaboration of several people from the Head-Fi and Headwize DIY communities to bring an advanced amplifier design to other DIYers. (The Headwize forum has since disappeared.)
The core of the PPA project was the PPA headphone amplifier board. It shared design elements with the META42 and one-off amplifiers created by ppl, plus it has some new ideas pioneered for the project.
This amp can be used portably as well as in stationary setups. To power the amp while mobile, we created a NiMH battery board with an on-board fast charging circuit.
There never was a dedicated “PPA power supply” but any audio-grade linear-regulated power supply will work.
Where to Next?
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Project FAQ
Assembling the PPA Project Pieces: Project History and Acknowledgements
Morsel's PPA Site