Previously Featured Builds

build

Tony

Tony

I have just completed a Bride of Zen preamp and a Zen Lite power amp. It took me about 6… More...
build

Mark Finnis

Mark Finnis

I have attached a couple of pictures of the Son Of Zen which is in construction. Not as pretty as… More...

Miscellaneous Projects — Webmaster / 2013

Here are some great project-submissions folks wanted to show-off.  They don't directly correspond with a single PassDIY project, but we still fealt like they should have a home.  Great work everyone!  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...

Copyright © 2016 Pass Laboratories, Inc. All rights reserved

Telephone: 530.878.5350