Audio Design

Projects



Mimir - A Class A Power Amplifier

This describes a 10-30 W class A power amplifier inspired by the Hiraga 20 W amplifier published in the early eightees in the french audio magazine l'Audiophile.
This amplifier is using only bipolar transistors.

There are also PCBs available.

A la Hiraga - A Class A Power Amplifier

This describes a 25 W class A power amplifier based on the schematic for the 8 W class A Hiraga monster amplifier,
 published in the early eightees in the french audio magazine l'Audiophile.

There are also PCBs available.

A MM Phono Amplifier

This design is a DIY two stage MM Phono Amplifier, inspired by Le Pacific Amplifier, a two stage JFET amplifier.
It is a two channel amplifier meant for moving magnet (MM) cartridges with onboard regulated supply, with external unregulated DC supply.
There are also PCBs available.

Nostalgia-A 25 W Class A Power Amplifier

This design is an all-FET Class A power amplifier, inspired by the 1969 Linsley Hood Amplifier (The JLH amplifier) and the newer Nelson Pass PLH amplifier.

Non-Feedback Class A Pre/power-Amplifier

This is an audio non-feedback class A amplifier, divided into two parts:
1) A Buffer Amplifier working in class A with a voltage gain of 0 dB, but with a very high current gain, and
2) A Voltage Amplifier also working in class A, with a high voltage gain and a low output impedance.
It is also possible to use this amplifier as a headphone amplifier or an ordinary preamplifier.

Current Feedback Class A Power Amplifier

This is an old design of a 'current feedback' power amplifier.

Cascode 'Non Feedback' Class A Power Amplifier

This is a very old design of a cascode 'non feedback' power amplifier with balanced design.

Headphone Amplifier

This is an old design of a MOSFET headphone amplifier.





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Knut Harald Nygaard