Four way switch..

[pinkles]

I have a physics project in school where I have to wire a system with 3 switches that will each turn a light on and off. I understand the concept behind wiring the 4 way switch, and so I need two 3way switches and one 4way switch. But the 4 ways at home depot cost ten dollars! That's crap! So I'm wondering, is there a way for me to wire my own 4 way switch?

There would be two inputs and two outputs, and when the switch is switched the input/output pairs are switched, so how could I replicate this on my own?


Input-----------output 1

Input----------output 2

Goes to...

Input--------output 2

Input--------output 1

[Psycogeec]

http://www.google.com/search?q=4+way+switch+electrical+diagram&hl=en&biw=1436&bih=556&prmd=ivns&tbm=isch&tbo=u&source=univ&sa=X&ei=BuwSTqrfE7DZiALj3t3bDQ&ved=0CCUQsAQ

make sure you study the simplicity of the 3 way switch first. using 2 siwtches and thier common connection

then mentally stuff the 3rd one in, which switches from top to bottom both at the same time and has to be DPDT
.