Earthsnail

I had the pins of the 3904 and 3906 transistors mixed up. I just need to flip them and it works fine now. Thank you for all of your help. I do have one question though while I'm at it. There is about a minute wait time before the buzzer sounds once it's unplugged from the phone line. I would like to shorten this wait time, and I imagine it primarily is because of the capacitor. I wonder, is it possible to shorten that wait time to about 30 seconds or so? If so, what size capacitor and other components would I need?

Whatever the thing in the wall is, that's what the device is being connected to, via some phone wire that I stripped to go into the PCB. I'm probably not explaining it very well, so I'll take a few pics so that you can kinda see what I'm talking about. I'll check to make sure I don't have the pins mixed up and will report back later.

I tried both of those things. The buzzer still sounds whether the inputs are to the wall jack/ 9v battery or not. No luck. Any more ideas or suggestions?

Hi, First, some background info (feel free to skip) I'm new to these forums, but I've been browsing this website for a while. I'm a member of the Georgia Technology Student Association (GATSA), and am a participant of the competitive event Electronics Research and Experimentation. I've worked diligently to find and fabricate a product with little success. My last attempts (including the one in question) have failed. Now, the problem (the important part) I finally chose the Cut Phone Line Detector as a final option. Here's a link of the project: http://electronics-lab.com/projects/telephone/006/index.html I put the components together and had made a PCB to make sure everything was correct. I followed the schematic perfectly and everything is in the right place. However, the project does not work. The detector runs on the principal of voltage. when plugged in to the wall, a certain amount of voltage is running through the device, making the load (in this case, a buzzer) remain off. When the voltage isn't present anymore (i.e., when the line is cut or it's disconnected), the buzzer turns on and produces sound. In my case, as soon as I connect the battery, the buzzer turns on and remains on whether it's plugged into the phone line or not. I am positive that I've connected everything correctly and that I followed the schematic exactly. Any help or suggestions is greatly appreciated. However, please remember that I am a high school student who knows only the basics of electronics, so please speak in layman's terms. Thank you again, and I appreciate your help. -Earthsnail