http://margo.student.utwente.nl/el/
audio

amphelp   .htm      Amplifier Repair.
audbuf    .gif      Buffered OP-AMP.
audiofaq  .zip      FAQ: rec.audio.*.
audiofor  .zip      FAQ about audio file formats.
boundry   .zip      Calculate response of your room (DOS).
boxplt13  .zip      Calculate response of speaker box, impuls
                    response etc (Win 3.1).
dolby1    .html     All about Dolby Surround Sound.
dolby1    .zip      Zipped version of dolby1.html.
filtry11  .zip      DOS filter design app. Works nice.
guitar    .htm      WWW page containing the GUITAR EFFECTS FAQ.
km241     .zip      Audio 100 W RMS amplifier.
listroom  .zip      The Listening Room helps determine suitable
                    speaker and listener positions (DOS).
loudsp30  .zip      Optimize speaker box design incl. graphs (DOS).
mic_amp   .zip      Simple Microphone Preamplifier in HTML format + gif.
mosfet    .gif      Some good-looking MOSFET amp
powerpcb  .zip      Some guidelines to making power amp PCB's.
pwramp01  .gif      10-watt single IC audio power amp.
pwramp02  .gif      20-watt single IC audio power amp.
ra-faq    .zip      Frequently Asked Questions (FAQ) file for rec.audio.pro.
riaa      .zip      RIAA correction for phono.
spkbox_d  .zip      Speaker box design / calculation Win3.1 app.
tcd15     .zip      The Crossover Designer V1.5 for doing quick and dirty
                    crossover calculations.
tonectl   .gif      Shelving tone control circuit.
vol_cont  .zip      Remote Volume Control.


Furthermore you should see a page of a friend of mine (Frantisek Rysanek)
who has some good schematics of cheap amps.

	Name	Last modified	Size	Description
	Parent Directory		-
	HEADER.html	31-Jan-2002 18:36	1.7K
	amphelp.htm	31-Jan-2002 18:36	11K
	audbuf.gif	14-Oct-1995 17:51	7.2K
	audio.html	31-Jan-2002 18:36	890
	audiofaq.zip	23-Sep-1995 16:17	92K
	audiofor.zip	09-Aug-1995 15:21	23K
	boundry.zip	27-May-1995 21:00	41K
	boxplt13.zip	27-May-1995 18:23	37K
	dolby1.html	31-Jan-2002 18:36	53K
	dolby1.zip	23-Feb-1997 15:16	20K
	filtry11.zip	24-Jun-1995 21:44	58K
	guitar.htm	31-Jan-2002 18:36	10K
	km241.zip	24-Jun-1995 12:12	12K
	listroom.zip	27-May-1995 18:22	65K
	loudsp30.zip	27-May-1995 21:00	76K
	mic_amp.zip	19-Jul-1996 20:59	3.5K
	mosfet.gif	11-Dec-1995 08:47	22K
	powerpcb.txt	21-Oct-1996 19:08	2.1K
	pwramp01.gif	23-Jul-1995 17:53	5.2K
	pwramp02.gif	23-Jul-1995 17:53	5.2K
	ra-faq.zip	23-Sep-1995 16:11	42K
	riaa.zip	07-Aug-1995 15:59	1.6K
	spkbox_d.zip	30-Jun-1995 14:48	566K
	tcd15.zip	30-Jul-1996 20:03	32K
	tonectl.gif	23-Jul-1995 17:53	6.1K
	vol_cont.zip	23-Jul-1995 21:50	33K