Aluminum Spool
July 12th, 2009
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How can I construct a 3-way switch for a science project?
In my science project for high school, I am using a 6V battery with series, parallel and combination circuits to power Christmas lights in a model house. I can make a simple switch with aluminum foil on a thread spool but I need to also make two 3-way switches to turn lights on and off from either switch. I also need to make a fuse (aluminum foil strips? steel wool strands?) and a pressure-activated switch activated by opening the model house closet door. All ideas and URLs appreciated.
A 3-way switch is actually a combination of two single-pole double-throw (SPDT) switches, arrange like so:
_____ / ¯¯¯¯¯¯ \ _____O___
¯¯¯¯¯_________¯¯¯¯¯¯¯¯¯
When either switch is thrown, it toggles the power onto either the upper or lower wire. You can make a SPDT switch by joining the poles of two single-pole single-throw (SPST) switches, and physically joining them so that one turns off as the other turns on. You could do this with 2 strips of foil on the same spool.
I would use the steel wool as a fuse. Even with multiple paths for the electricity, a 9V battery shorted across a piece of it will cause it to burn. You should be able to twist multiple threads into a fuse of the desired capacity.
To make a pressure switch will require a spring. I would find one (not too stiff) that fits inside a thread spool. Remember, you can cut a spring if it's too long. On one end of the spool, attach two strips of aluminum foil. Then cut out a circle of cardboard and glue aluminum foil to one side. Use a toothpick or coffee stir to make a plunger with it (long enough to go through the spool). The spring will need to push against something inside the spool (but not that it restricts the plunger from going through). Maybe glue a small washer, or some small pieces of wood on either side of the center of the spool on the foiled end. Put the plunger in, and insert the spring through the other end. Then you just need to put a brace on the end of the plunger so that the spring pushes the switch closed, but when you push on the end of the plunger, it opens.
Alternatively, you could use the deformation of a hoop of cardboard or a roll of paper. You place two posts inside the hoop, glued to the edge, and just touching in the middle. You cover these with foil. When you squeeze the hoop, it distorts into an oval, and the posts separate.
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