Dual-Channel Prototype

Well, it's nice when something works. I thought up a dual-channel metal detector (of the Beat Balance variety), and just built one of the two channels. It worked first time -- just the tuning is a bit too responsive. I checked it with an oscilloscope, and there was a perfect trace. Then I checked it with a radio, and the signal was dirty. OBSERVATION: That doesn't add up -- but the oscilloscope is almost certainly correct, and the radio is almost certainly junk. I'll prove that once I have built the second channel. It has always fascinated me how a design in the mind works in reality.