When working with electronics, breadboards are a cheap way to put together circuits. Having professional Printed Circuit Boards made can be very expensive in small quantities, but the results not only make projects easier to construct but also make them look fantastic.
http://headwize.com/projects/garbz2_prj.php
I live in Manhattan on the Lower East Side. Manhattanites are the perfect headphone canidates. It's all you get to listen to. We don't HAVE cars. We walk or subway or cab ($$) everywhere. I listen to headphones 4-10 hours everyday.
http://headwize.com/projects/showfile.php?file=apheared_prj.htm
You really need to see the original article - Project 36 - to see all the design details for this project. The project presented here is simply a modification of the original design, with much lower power dissipation and adapted specifically as a headphone amplifier.
http://sound.westhost.com/project70.htm
The ping of the cymbals, crack of the snare drum, thonk of the bass - none of these comes through on my low-budget speakers. Sometimes they sound so fuzzy I want to hide behind the couch until it’s over.
http://headwize.com/projects/showfile.php?file=guitar_prj.htm
Here i propose a project of an AB class power amplifier, at its simplest, assembled with common compoments (not very expensive), based on traditional diagrams : a symmetrical differential input stage, a cascode stage driver and a MOSFET output stage.
http://users.swing.be/edwinpaij/ampli_mosfet.htm
The purpose of this circuit is to automatically turn off any device plugged into its power outlets after a certain period of time. Shutoff is activated by an absences of an audio signal or by a standard timer function.
http://home.maine.rr.com/randylinscott/feb20.htm
The circuit can help if you must transfer dc power and audio over a pair of copper wires. One application for such a circuit is a low-cost door-opening system with speech input.
http://www.edn.com/index.asp?layout=article&articleid=CA185953
These tutorials (parts 1 to part4) will teach you in very easy steps how to design A class amplifiers. I will attempt to de-mystify most aspects of design by my usual extremely casual approach to an electronic tutorial. It does not matter whether you are into hobby electronics or amateur radio design, the basic principles apply for audio or r.f. circuits.
http://my.integritynet.com.au/purdic/rf_amp.htm
This amplifier may also be suitable for other computer games machines, although the audio-video connectors will be different. You will have to work out the necessary connections yourself.
http://www.web-ee.com/Electronic-Projects/projects/headphone_amp/index.htm
Here is a fairly simple regulated power supply circuit using a zener reference and a series pass transistor that I built to power a vacuum tube microphone preamp project. It's not really something that I designed. It's just based on text book examples, some existing circuit designs, some tinkering on my part, and a lot of help from friends.
http://members.nuvox.net/~zt.robgrow/circuits/powersupply/regpowersupply.html