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there are a couple of things. Generally the more complex bridges like canteliver,arches, suspension will be used for long spans while plate girder etc will be used for shorter spans. Also generally through bridges are only used when clearance is a problem under the bridge. Just use common...

Like everyone else has said I think you need to momentarilly apply power to the coil. When you were doing you testing did you keep the power on the set coil? If you did then the reset would do nothing as you told it to set and reset at the same time. Ayhow if you need a really simple...

Hey tom, For safetys sake why not add a fuse to the triac circuit? If it ain't there most people are going to be afraid to put it in while if it is there people are going to be reluctant to omit it.

One thing I'd reccomend is getting good quality wire not the cheap stuff. As it will cause far fewer problems. Higher quality wire will generally have more thiner strands than low quality so it will be more flexible and less likely to break. It'll also have been plated so it'll look a...

Mybe it's time to have a go at scratchbuilding your own switch? It's really not as hard as it looks. http://members.shaw.ca/paul_davis/MRR/images/track001.jpg

Here's my own little guide to soldering/desoldering. There arn't any pictures but I'll add some sometime. http://members.shaw.ca/paul_davis/Electronics/solder.html And here's a picture of some solder wick.

For the desoldering I'd reccomend getting a flux pen. I wouldn't attemt to desolder without it. Aply plenty to both the joint and the wick. Not only will the heat transfer quickly (so the soldering iron doesn't have to be on the rail as long) but the solder will just fly into the wick...