Electronic Kit Build: $5 Metal Detector Treasure Locator

Kit build of a $5 electronic metal detector. The unit works, but only when metal objects are placed very close to the coil. Purchased here: DIY Kit Simple Metal Detector Metal Locator 3V－5V DC Electronic Production Good http://www.ebay.com/itm/-/131252426069 Some modification ideas here: http://www.talkingelectronics.com/pro...