Previously Featured Builds

build

Mark

Mark

Very impressed with the changes to the Pass Labs site. Have been a fan of Nelson since the original Class… More...
build

Heng Lee

Heng Lee

First of all I want to thank Mr. Nelson Pass and the crew at Pass Labs for lending the support… More...

Amp Camp Project — Pass DIY / 2016

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