Car amplifiers ( 54 ) :

• 20 Watt Power Amplifier - designed to be used as car amplifier   
• Car amplifier information and schematics   
• Car Amplifier Schematic   
• Car Audio Schematics - car amplifiers   
• Car tube pre amplifier   
• Do It Yourself Car Amplifier - This article is for those who wants to make their own car amplifier. The basics of calculation will be discussed below. If you have understand it you will be able to make car amplifier based on   

Power amplifier accessories

• A DC Fault Protection Circuit for Audio Amplifiers - circuit ideas how to replace traditional CD protection relays with MOSFETs   
• Bridging Adaptor For Power Amplifiers   
• Loudspeaker Protection and Muting   
• Loudspeaker Protection circuit - DC protection circuit   
• Power Follower with Dinamic Current Source by Reinhard Haffmann - less wasted power than true class A but not as good sound   
• Power Amplifier Clipping Indicator   
• Soft Power On Tester for Amplifiers   
• Speaker protector   

Headphone amplifiers

• A DIY Headphone-Amplifier with Natural Crossfeed - check also   
• An Acoustic Simulator for Headphone Amplifiers - a simple RC filter that creates a more realistic sound image in headphones by electronically mimicking spatial hearing with "shaded" interchannel crossfeed   
• Build These Noise-Canceling Headphones - plus Binaural Microphone Headset, Audio Probe, and Parabolic Microphone   
• Designing an Opamp Headphone Amplifier - This article has design information and many circuit examples   
• HeadBanger Headphone Amp Construction Kit   
• Headphone Amplifier - designed for Sega Megadrive, but can be used with other line level signal sources, Originally published in ETI, December 1994   
• Headphone Amplifier from SDS Labs - uses a push-pull Class A MOSFET output stage, being driven by an op-amp   
• HeadWize Projects - many headphone amplifiers and related circuits   
• Kumisa Mk. II - DIY headphone amplifier project using AD844 and some special transistors   
• Mapletree Audio Designs (MAD) Ear+ Stereo Headphone Amplifier Kit - This tube headphone amplifier kit manual has building instructions and full circuit diagram of this device.   
• QRV-04 - The high performance SMD headphone amplifier - Cute SMD headphone amp designed especially for OPA134, OPA627 and AD8610 plus a buffer BUF634.   
• SDS Labs Headphone Amp - solid state amplifier   
• Top-Level OTL Tube Headphone Amplifier   

Headphone amplifier accessories

• HJ-4P Professional headphone distribution box - drives up to 4 headphones from a single amplifier, has volume control and mono switch, product datasheet with circuit diagram in pdf format   
• HJ-6 Standard headphone distribution box - drives up to 6 headphones from a single amplifier, product datasheet with circuit diagram in pdf format   
   

• Instrument amplifiers
   

  • 100W Guitar Amplifier   
  • Cool Schematics - solid state and tube guitar amplifier circuits   
     

• Preamplifiers

  • ALL-FET MC phono preamp - phono preamp with 54 and 64 dB gain and RIAA accuracy is better than 0.2dB, from   
  • A Pocket Headphone Amplifier - This is a portable headphone amplifier for testing purposes using Burr-Brown OPA132 opamp in a non-inverting configuration, powered with 9V battery.   
  • A Transformer Coupled Linelevel preamplifier by Thorsten Loesch - This is a very simple tube based line stage.   
  • Audio Preamp - simple preamp for electric guitar or microphone   
  • Basic Passive Linestage - A passive linestage is simple to build and makes an excellent first audio project. Building one is a good way to practice soldering skills and construction techniques, and as no power supply or active components are required it is also a safe project for beginners.   
  • DACT Passive Preamp Document   
  • Driving The Power Amp: A simple line stage preamplifier project - Thos document describes one passive preamplifier design and some tube based preamplifier designs.   
  • Equalized Passive Preamplifier   
  • Hi-Fi Preamplifier   
  • High-Performance Audio Applications of The LM833 - RIAA phono preamplifier stages and active crossover networks   
  • High Performance Passive Linestage   
  • Hiraga MC -Moving Coil f�rst�rkare   
  • Kaneda Linjef�steg - includes phono and line inputs   
  • Mic-Pre Pan Pot Circuit   
  • Passive Linestages   
  • Preamplifiers - This site provides many preamplif�er plans   
  • Simple Car Preamplifier and Artificial Earth   
  • Simple Guitar Preamplifier   
  • The TNT Pressive�: A DIY passive preamplifier   
  • Vanhat vinyylilevyt CD-levyiksi tai MP3-kapetiksi RIAA-korjaimen avulla - This is a simple RIAA preamplifier that can be plugged to a PC soundcard. The text of this document is in Finnish.   
     
• Application notes and datasheets
   

  • Power Amplifier Design Guidelines  
  • Cool Audio - application notes on PWM amplifiers   
  • LM12CL - very compact IC for making good quality 80W audio amplifier, this IC has been used in some high quality active loudspakers   

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