LOOKING FOR INPUT ON LAPTOP METAL DETECTOR 18 FOOT COIL FOR FERROUS LARGER OBJEC

I like the part with 20 bucks. I think I see your vision. You want to map the underground according to the transmit signal. They do have those devices, can't say that I have looked at them, but I would like to if I knew what they are called. As for your idea, 20 bucks would go a long way for refreshments while building the project. Ok, maybe not. The spectrum analyzer is ok, but think about it for a moment. what is it you expect to see with it? You send a signal with the tx coil and you receive the same signal, kinda. So what you need to do is figure out what signal do you want to see in return, a slight change in power maybe, when disturbed by an object, maybe a phase difference of some kind, where the signal takes on a Doppler effect, and the signals frequency is shifted slightly, maybe need to add a timed input where the rx only kicks in during the decay of the pulse. So in that case build a PI oscillator, or heck use you laptop to generate any frequency you want, within range of laptop, then use the sound output to drive a mosfet circuit that drives the coil. That part should be a piece of cake. Now, just a minute...... Ok I got it. Just make or use an existing PI design, such as Gary's PI ll, and just hook the sound card up to the detectors speaker jack and adjust the output as to not over drive the sound card. In other words all you need is a PI unit and plug into the sound card, from the speaker jack, from the PI unit. When the detector unit varies the sound, have the computer start recording data, GPS, and other to a spreadsheet or whatever. You can even use screen recorder to record the screen. So all you need is to make a program to turn on and off other programs. These programs can be started manually or by an external component monitoring the output from the detector or from the spectrum analyzer revised to run your programs. Just my thought.

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