Walk Through Metal detector Circuit digaram

[Carl-NC]

Here is an easy W/T design:

• Use a standard PI detector circuit
• Place the TX coil in one panel (usually the left panel, looking from the entry side)
• Place the RX coil in the other panel

Improvements:

• Split the RX coil into two parallel coils, out-of-phase, which will cancel outside interference signals (see the Garrett photos)
• Synchronize the TX frequency to a multiple of the power mains (50/60Hz) to minimize interference
• Use bipolar pulsing on the TX to further minimize interference
• Add an infrared beam to gate detection only during a walk-through, minimizes false detections and can also serve as a people counter
• Add ankle boost coils to compensate for floor rebar (see Garrett photos)

[rajesh]

walk through detector

Here is an easy W/T design:

• Use a standard PI detector circuit
• Place the TX coil in one panel (usually the left panel, looking from the entry side)
• Place the RX coil in the other panel

Improvements:

• Split the RX coil into two parallel coils, out-of-phase, which will cancel outside interference signals (see the Garrett photos)
• Synchronize the TX frequency to a multiple of the power mains (50/60Hz) to minimize interference
• Use bipolar pulsing on the TX to further minimize interference
• Add an infrared beam to gate detection only during a walk-through, minimizes false detections and can also serve as a people counter
• Add ankle boost coils to compensate for floor rebar (see Garrett photos)

hi carl-NC i have much more delta pluse or hammerhead. can you suggest me some schematic part change coil configuration for walk through metal detector........