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Offline tbreakTopic starter
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« on: December 10, 2017, 06:50:30 am »
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Just started a Pi detector. Pancake coil using the inner of satalite tv cable to get low self capacitance. With about Three turns at each diameter its bulky filling 8” to 10” diameter. Srf > 2MHz. Drive circuit is running well enough that aluminum foil at 2” from the coil literally buzzes audiably. No I dont have any audio circits or speakers, this is the foil making sound. Has anyone else ever noticed this?

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Offline Homefire
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« Reply #1 on: December 10, 2017, 08:52:10 am »
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   Your resonating the target.  The Magnetic Pulses are producing a fluctuating current within the target.  These currents are polarizing the aluminum back and forth enough to cause it to physically change shape enough to produce a sound.  Cool, eaa ?    Like a loose winding on a transformer will buzz. 

 Photo's are always a Plus .



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« Reply #2 on: December 11, 2017, 06:45:31 pm »
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Welcome from Kansas! Now just crank up the juice and maybe the target will just vibrate itself out of the ground! Cheesy

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“Silence in the face of evil is itself evil: God will not hold us guiltless. Not to speak is to speak. Not to act is to act.”  ― Dietrich Bonhoeffer
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« Reply #3 on: December 17, 2017, 09:39:44 pm »
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Um.....not the norm but then again this forum is part of the "Twilight Zone!"

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