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user57(a75-p13)

user57

Heatsinks can be a major obstacle to building many of the Pass DIY projects. I built a version of the… More...
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Günter Vogl

Günter Vogl

hello, I am writing to you from the south of Germany ( not too far away from Munich). Now I… 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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