4011 Metal dedektör
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- 4011 cd4011 metal dedektör
POCKET METAL DETECTOR
As with most metal detectors; this design works on the principle of detecting the difference (or beat note) obtained by the mixing of two oscillators, the frequency of one which can be caused to alter, when the presence of a metal object is near its "search-coil" which is one of the frequency determining elements, of one of the oscillators.
The other is a fixed or reference oscillator (400KHz).
The circuit uses two CMOS IC’s
IC1 uses inverters connected as a Colpitts oscillator of 100KHz; the LC frequency determining elements being the search coil and parallel resonating capacitor.
An 80 turn close wound 30swg 100mm diameter coil will fit inside the CD case.
I will leave the choice of the IC to the reader: this can be any of the well known CMOS inverters or NAND, NOR gates etc configured as an inverters. The choice is yours, use whatever you have on hand.
IC2 can be either 74C00 or 4011 quad NAND gates.
As with most metal detectors; this design works on the principle of detecting the difference (or beat note) obtained by the mixing of two oscillators, the frequency of one which can be caused to alter, when the presence of a metal object is near its "search-coil" which is one of the frequency determining elements, of one of the oscillators.
The other is a fixed or reference oscillator (400KHz).
The circuit uses two CMOS IC’s
IC1 uses inverters connected as a Colpitts oscillator of 100KHz; the LC frequency determining elements being the search coil and parallel resonating capacitor.
An 80 turn close wound 30swg 100mm diameter coil will fit inside the CD case.
I will leave the choice of the IC to the reader: this can be any of the well known CMOS inverters or NAND, NOR gates etc configured as an inverters. The choice is yours, use whatever you have on hand.
IC2 can be either 74C00 or 4011 quad NAND gates.
