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.
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