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Look, there are a new firmware v2.0 and a lot of description of this nice metal detector.
But if you will look trough that site, you can find new construction on AVR, it is on Russian. It is strong - on Pulse Method and is very simple for this method, because of microprocessor using. I have made it, but waiting a summer to make experiments - As great O'Henry was writting about us:
"There are many kinds of fools. Now, will everybody please sit still until they are called upon specifically to rise?
I had been every kind of fool except one. I had expended my patrimony, pretended my matrimony, played poker, lawn-tennis, and bucket-shops--parted soon with my money in many ways. But there remained one rule of the wearer of cap and bells that I had not played. That was the Seeker after Buried Treasure."