Basic electrical engineering question
I have a project that I am working to help a friend of mine who works in a climbing wall. They had an existing siren at the top for the kids that someone broke, and wanted to switch it out to something that they could put custom sound effects on. I happened to think of the 9V recording module at Radio Shack (http://www.radioshack.com/product/index.jsp?productId=2102855#tabsetBasic), and proceeded to hack it to make it more usable for their needs. I made two different parts to it: 1. The recording module in a project box, and 2. A momentary switch at the top of the wall to trigger the module. I changed the microphone on the recording module to a 1/8 in jack, sent the speaker output to a better speaker (with an amp of course), added a record button to the outside of the main project box, and created a "triggering system" by soldering a separate wire to both 1 and 2 in the picture, and then shorting it whenever I want to trigger the sound. It worked perfectly in my shop, but when I installed it, the test trigger on the ground works, but the switch on top of the wall does not work well... it only works intermittently. The wall is 2-stories high, so figure a 22 foot run for the wire (and I don't remember what gauge wire I used... it was just something I had laying around... but figure cheap speaker wire).
My first guess was that it wasn't getting enough power from the battery, so I switched it out to a AC-DC adapter instead of the battery. I am still having problems, so I am guessing it is too much resistance due to the long run? (Would you agree or disagree?) If so, is there some type of amplifying circuit that I could use to overcome this? The only other explanation that I have is that the momentary switch that I am using at the top is pretty old and could be going bad, but I wanted to check first and see what you EEs out there think.
Thanks for your help! :)
I'm sorry I am so bad at explaining this... I have uploaded my attempt at a schematic for clarification.
After installing a new switch, it did work a little better, but still not 100%; so I installed the relay, which solved the problem. Thanks to everyone who helped! :)