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Simple Metal Detector Circuit Using BC548 Transistor
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3 Ways to Build a Metal Detector - wikiHow
RADIO DETECTION
Micronta-Metal Detector Radio 63-3002 w/Adjustable discriminator circuit TESTED | eBay
Metal Detector Circuit using a Single IC
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How To Make A Metal Detector With A Radio
Metal Detector
How to Make a Basic Metal Detector – SurvivalKit.com
Metal detector using radio frequency
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How to turn your AM radio into a metal detector | The SWLing Post
