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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...


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...


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...


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...


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...


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...


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...


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...


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...


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...