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Headphone jack readings

 

I will have to find the name of the app, I searched but I think the site is down. You had to build it with the SDK the app itself was built for the iPhone and I used my fet dogle (the epoxy coil windings......I used a relay and re soldered it to work). I just need some source that detects frequency levels.....instead of sound it should work the same with magnetic waves or high electromagnetic pluses. I just want to count those pulses and plug them into my formula.

 I have tested it on an android frequency viewer with my phone. Seemed to work then the dogle needs work but it should be enough to test the app with. Any source or direction would be great.

I can hack away from there