Originally posted by Fred
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I built the EPE "Magnetic field detector" by Andy Flind. I change the common transformer by spiral coil and both pass electrolitic by ceramic for to stop the very low frequencies. Remember, the capacitors in inputs are the first filter. I put this in metal box, very different if you build in wood box. Metalic box is very better in this circuit.
Don't know why, you obtain strong signals in inland in X type of terrain, not causes by treasures, maybe teluric currents? Is rare, but occurs.
With some modifications this is a medium range MD. If you put many turns, for example, this is a spiral of 15 cm diameter, tends to catch since rifle cartridge. But if you build in toroid core 1.7 or 2 ohms and appropiate aluminium rectangular antenna, this filtrates much the bronze and comes silver, for example.


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