Audio circuits

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Audio OpAmps

Audio Power circuits and modules

A/D converters

D/A converters

Misc. audio devices

Audio(*) OpAmps  

(*) On my website I object many special "Audio" components like capacitors, cables and much more. In electronics we generally do not have components specifically for audio applications. Sure certain components are better suited for certain locations in certain audio circuits, but that does not make them "audio components"
For Operational Amplifiers (OpAmps)  the cards are somewhat different. Traditionally OpAmps have a very bad reputation in audio applications. That's mainly because the usual OpAmps have quite some inherent distorsion (non-linearity) and to little Gain-Bandwidth Product (GBP) to reduce this distorsion to acceptable levels over the full audio bandwidth.  
For over two decennia however (I write this in august 2007) several OpAmps with extremely low inherent distorsion and a sufficient large GBP are available from many manufacturers for very comfortable prices.
These OpAmps are generally refered to as "Audio" OpAmps, although they may also benefit other applications where a very good linearity is required.

Be aware that even an opamp with extremely low specified distorsion may perform disappointingly when used inapropriate. 
A particular risk is the non-linear input capacity which all integrated circuits have. When the inputs carry a substantial voltage swing and are fed from a high impedance source this non-linearity may ruin the perfromance. The message is: Use opamps in inverting mode, with the + input grounded, OR provide a low source impedance. As an example: A filter built with the the Sallen-Key topology may show substantial distortion, where the same filter in Multiple Feed back topology performs perfectly.
Another sneaky thing is associated with opamps allowing "rail to rail" input voltage, either FET or bipolar. These opamps have a P- and an N- type pair of input transistors. Somewhere between the + and the - rail the P has to take over from the N. And these transistor pairs very likely will have different offset voltages and different input bias / offset currents. 
Again the message is: Use them in inverting mode. A low source impedance will not help in this case.

Audio Power circuits and modules

A/D converter

D/A converter audio

Misc. Audio Circuits