Preamp Design

Designing low-noise preamplifiers for microphones, instruments, and phono cartridges.

Preamplifiers amplify weak signals to line level while adding minimal noise and distortion. From microphone preamps to RIAA phono stages, good preamp design is essential for high-quality audio.

Objectives

  • Understand preamp requirements for different sources
  • Design low-noise input stages
  • Implement RIAA equalization for phono
  • Calculate gain staging to optimize headroom
  • Apply proper grounding and shielding techniques

Key Takeaways

  • Input stage noise dominates overall performance
  • Match input impedance to source requirements
  • RIAA phono EQ has precise frequency response curve
  • Proper gain staging maximizes dynamic range