25-01-2015, 05:01 AM
How to increase the range of metal detector circuit
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vegakit 557 metal detector working
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How to increase the range of metal detector circuit
10-03-2017, 12:39 PM
The metal detector circuit shown here should represent the limits of simplicity for a metal detector, but the design works surprisingly well. It uses only a Schmitt 40106 hex inverter IC, a capacitor and a search coil - and of course the batteries. An IC1b pin 4 cable needs to be connected to a medium wave radio antenna, or it must be wrapped around the radio. It can be used even if the metal hand detectors.
As shown, the metal detector gives a respectable range for blow frequency operation (bfo) up to 90 mm for a bottle cap. In fact, for the ultimate in simplicity, the capacitor C1 can be omitted. In this way, the author achieved an incredible range of 150 mm for the bottle cap. However, with the frequency rising to more than 4MHz, instability becomes a significant problem.
As shown, the metal detector gives a respectable range for blow frequency operation (bfo) up to 90 mm for a bottle cap. In fact, for the ultimate in simplicity, the capacitor C1 can be omitted. In this way, the author achieved an incredible range of 150 mm for the bottle cap. However, with the frequency rising to more than 4MHz, instability becomes a significant problem.
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