Welcome to this website with a selection of audio articles and new and former audio amplifier projects.

The project section is describing do-it-yourself amplifiers, free for use on a non-commercial basis.

The author has no responsibility what so ever regarding these descriptions.

For the following projects Gerber files are available:

• Mimir with Power Supply
  
• Phono Amplifier
• Phono Amplifier v.2
• Class A Power Amplifier Mimir v.2
• Passive Preamplifier
• A la Hiraga Monster
  

The first transistor (Bell Labs 1947)

Theory

• RIAA
  
• DC-coupled Amplifiers
  
• Class A Amplifiers
  
• JFET Amplifier
• Non-switching class A/B
  

Projects

• Cascode Amplifier
  
• Headphone Amplifier
  
• Mimir (a la Hiraga)
  
• CFB Power Amplifier
  
• Non-Feedback Amplifier
  
• Phono Amplifier
• Phono Amplifier v.2
  
• A la Hiraga Monster
  
• Nostalgia (a la JLH)
  
• Mimir v.2 (Class A 25-30 W)
• Passive Preamplifier
• Non-switching amplifier
  
• 10-25-30 W Class A (ASK)

Copyright©2025
Knut Harald Nygaard