All articles

Towards advanced audio power amplifiers

Author(s): Zan David

In his Guest Editorial, David Zan argues that almost all power amplifier designs have gyrated to a few standard design topologies. However, he believes that...

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TPC and TMC Feedback Compensation for Power Amplifiers

Author(s): Cordell Bob

Bob Cordell explored power amp compensation techniques that allow the designer to employ more feedback loop gain at higher frequencies, improving amplifier linearity...

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Fine-tuning and measurements of a sensorless motional feedback subwoofer

In his earlier article, Robert Munnig Schmidt described a subwoofer system with an electronic solution to adapt and control the subwoofer mechanical-dynamic behaviour...

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RIAA revisited, or how to better judge documented figures

Author(s): Polak Hans

Hans Polak noticed that the noise specifications of RIAA preamps are often given in units and operation conditions that make it hard to easily judge the comparative...

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Introduction to noise

Author(s): Quan Ronald

Noise in audio circuits hampers the ability to listen to low level details in the signal. In particular, it degrades S/N ratio in low level signal circuits such as...

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Multiplied Transconductance Amplifiers

Author(s): Blöhbaum Frank

In the heydays of AM radio receivers some tubes were produced having up to 6 grids, called octodes. These tubes can be arranged as a triode and a hexode in a common...

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Proteus – a current input moving coil preamp

Although Erno Borbely must have designed a dozen or more phono preamps, he never tires of trying new avenues of circuit design to find that elusive holy grail. In...

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Practical Electronic Control of Class AB output stage quiescent current

Author(s): Joffe Daniel

Controlling the quiescent current in class AB output stages has long been the Achilles heel of such amplifiers. Low crossover distortion depends critically on correct...

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The High-Octane phono preamp

Author(s): Allmaier Hannes

Hannes Allmaier likes to design phono preamps because of the interesting mix of conflicting requirements of low noise, correction accuracy, headroom and dynamic range...

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A concise model for Static Induction Transistor IV characteristics

Author(s): Rothacher Michael

Static Induction Transistors are solid state devices that have triode-like characteristics. This has caused some popularity of SITs in audio already since the Yamaha...

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