Previously Featured Builds

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Erik Hoogma

Erik Hoogma

After two years of gathering parts, I've finally a working A5. As an electrical engineering student it's hard to find… More...
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Norbert

Norbert Kulcsar

Here are some pictures of the completed amp. (Sorry for the bad quality, I have only a very simple digi… 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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