I was reading a thread on the SSCA board about foghorns and one guy suggested a cheep alternative would be an old car horn, which got me thinking. Sitting around for hours pressing a button or blowing a foghorn would be really boring so how could I automate the process.
Some kind of timer circuit hooked to a relay which would apply 12vdc to the car horn would do the trick. I found this at Fry's Electronics.
http://shop4.frys.com/product/1743197#detailed
Built into one of those Radio Shack project boxes with a 12v plug attached it could be plugged in and ready for use quite easily and expensively.
Automatic Foghorn Project
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That would do it. Or you could go pick up any 555 timer project kits at Rat Shack that will do the same thing. Price will be within a few bucks one way or the other. Pick yer Poison.
For all the info you'll ever want on these chips: http://www.uoguelph.ca/~antoon/gadgets/555/555.html
For all the info you'll ever want on these chips: http://www.uoguelph.ca/~antoon/gadgets/555/555.html
Tony
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Tony, your inner geek is showing :D Interesting site though. Guess that means my inner geek is showing too, of course, after a post like this, I suppose there was no doubt about that. ;)
Radio Shack's always a good source for stuff like this too.
I think my VHF predates all these goodies by just a year or so, but that is a good option if you are looking for a new one.
Radio Shack's always a good source for stuff like this too.
I think my VHF predates all these goodies by just a year or so, but that is a good option if you are looking for a new one.