Here's a small assortment of links that I found either interesting or useful (let me know if any are by using my feedback form). Also, I'd be interested in hearing about any sites that may be relevant to this site and you think could be listed here.

I consider everything listed here to be well worth a visit.

Electronics

1. Circuits

• ePanorama. Source of useful electronic (circuits and other) information - actually a compendium of links.
• Harry's homebrew page. Harry's collection of home-grown circuits.
• Electronics Zone.
• 4QD.
• FC's Electronic Circuits.
• Electronics Hobbyist.
• CommLinx. Stacks of circuits (compendium of links).
• Red Circuits. Miscellaneous circuits.
• Electronics Index. Miscellaneous circuits and design notes.
• Circuit Exchange. Mix of designs.
• technick. Data and designs.
• Analog Devices have some useful application notes relating to noise in op-amp circuits: AN253, AN358.
• So do National: AN-104, OA-12.
• Linear Technology has a program (70k) for basic op-amp noise calculations - see their software download page.
• Electronic Filters. National application note on analog, passive and switched capacitor filters.

2. Radio

• ARRL. (American Radio Relay League, Inc).
• Han's Radio. Cicuits and links.
• BBC technical reports on transmission and radio-frequency.

3. Television and Video

1. Technical

   • Narrow-band tv association. Low definition and mechanical tv + lots of tv related links.
   • BBC factsheets. Reception advice for tv and radio (all in pdf format).
   • BBC technical reports on video and colorimetry.

2. Historical

   • Tv From Alexandra Palace. Early BBC.
   • Early Color Television. US colour.
   • History of early color television. More US colour.
   • Color Television History.
   • Early Television Foundation.

3. Applications

   • Video Circuit Collection. Application notes from Linear Technology.

4. Mending Things

• Homepage for next three links - other types of equipment can be found.
• Notes on the Troubleshooting and Repair of Small Household Appliances and Power Tools.
• Notes on the Troubleshooting and Repair of Optical Disc Players and Optical Data Storage Drives.
• Notes on the Troubleshooting and Repair of Audio Equipment and Other Miscellaneous Stuff.
• Salvaging Interesting Gadgets, Components, and Subsystems.

Photography and Film

1. Movie

• Animato. Animation and technical film site. Lots of links.
• Flatbed Scanner Digital Telecine (FSDT) Project.

2. Still

• The Empire That Was Russia. Amazing colour photographs from pre-revolutionary Russia.
• Karl Grobl. Professional photographer.
• Reversal Processing. Links to sites describing various processes (colour and B&W). I used to reversal process ordinary B&W film (I've used Tri-X and Plus-X) because it's a very cheap way to produce photos and you don't need a darkroom. The process I used required a developer that's no longer produced and I have yet to try any other method.

Science

1. Optical Illusions

• Grand Illusions. Has to be seen not to be believed.
• Optical Illusions. Eye don't believe it.
• Brain Bashers.
• The Illusion Gallery.
• Psychological ARTS.

2. Physics

• Virtual Physics Lab.

Maths

• Plus Magazine.
• The Mathematical Atlas.
• THE MOST COMMON ERRORS IN UNDERGRADUATE MATHEMATICS.

Free Downloadable Software

• CircuitMaker Student Version - Virtual Electronics Lab.
• Schematic Publisher - schematic capture.
• TinyCad - schematic capture - Download ZIP.
• Personal Firewall - ZoneAlarm 3 from Zone Labs.
• Texas Utilities - includes what appears to be the best (free) analog filter design s/w available.
• FilterLab - Microchip's filter design software. The versions that I downloaded (1.0.40 & 2.0.0.0) do not display the amplitude of frequency reponses of even order Chebyshev filters correctly - the response is reduced at all frequencies by a value equal to the ripple - this gives an optimistic stop-band attenuation - I don't know if the ant-aliasing wizard is fooled by this error - but if you're using this software - use it with care.
• FilterCAD - Linear Technology's filter design software.

Software and other Free Things

• The Free Site - Links to: Free software, Fonts, Music, Web Space, etc

Hoaxes

• Hoax News. Read this before you believe what you're told in some email that's just arrived in your inbox.
• Hoax List.

Others

• Hereford String Orchestra.
• Malvern Suzuki Concert (June 2001).

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Last updated: 26 June 2004;    © Lawrence Mayes, 2001-2003