Previously Featured Builds

build

Steve Markstrom

Steve Markstrom

Here are a few pictures of my Balanced Line Stage/Pearl combination preamp. The Pearl is built with the Pass DIY… More...
build

Kiril Kirilov

Kiril Kirilov

Recently I've finished my version of integrated Zen V4 and BOZ in a common enclosure. Some of my best friends… More...

Construct a Class - A Amplifier — Nelson Pass / 1977

Most audio power amplifiers use class A circuitry except in the drive and output stages, where they use class B or AB operating modes to achieve high efficiency. In class B and AB modes, the output stage operates in a pushpull configuration, where one set of output devices delivers positive voltage and current and another set delivers negative voltage and current. When one set is working, the other set is turned off. This scheme operates efficiently, but has two serious flaws, the extremely nonlinear characteristic of the transistors at the collector cutoff region and the turn-on/turn-off times of the devices.… More...

Amp Camp Project — Pass DIY / 2016

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