Metal Detectors and Sensors Circuits
#metal detection
#sensor circuit
#inductive sensor
#proximity sensor
#coil design
#signal processing
#frequency oscillator
#electromagnetic field
#treasure hunting
#security screening
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Doorknob Proximity Alarm for wooden door
Reverse engineered circuit diagram of a popular retail doorknob alarm. It contains a small transmitter and the doorknob acts as an antenna so it will not work on a metal door. When a person comes close to the doorknob this...
Manpower sensing alarm circuit
The manpower inductive alarm circuit is simple and practical. When a person's hand approaches the sensing line, the alarm emits a sound, making it suitable for male electrical burglar alarms. The induction line L is approximately 50 cm long. If...
Simple Proximity Detector & Alarm Circuit
This is a simple proximity switch utilizing the IC 4049. The IC 4049 is a bipolar monolithic integrated circuit designed for metal detection systems and proximity sensing applications. It includes an oscillator formed by an external parallel resonant tank circuit...
Electromagnetic Field Probe with Meter Output
This tester is designed to locate stray electromagnetic (EM) fields. It can easily detect both audio and RF signals up to frequencies of approximately 100 kHz. However, it should be noted that this circuit is not a metal detector, although...
Electromagnetic Field Probe with Meter Outputs
This tester is designed to locate stray electromagnetic (EM) fields. It can easily detect both audio and RF signals up to frequencies of around 100 kHz. However, it is important to note that this circuit is not a metal detector,...
Metal Detector Circuit
Metal Detector Circuit Overview The metal detector circuit is an electronic circuit that is specifically designed to detect metal that lies deep in the water.
The metal detector circuit operates on the principle of electromagnetic induction, where a coil generates an...
make electromagnetic field
This circuit is a valuable tool that is easy to construct and more sensitive than many commercially available devices. It is based on an LF351 low-noise operational amplifier and a 1mF choke functioning as the sensor. Unlike most simple EMF...
Sensitive electromagnetic field sensor
This circuit diagram represents a highly sensitive electromagnetic field sensor capable of detecting electromagnetic fields in the frequency range of 40Hz to 140Hz. The low-noise operational amplifier LF351, along with its associated components, comprises the pick-up section. A 1µH coil...
electromagnetic field detector
This circuit is easy to assemble and exhibits higher sensitivity than many commercially available devices.
This circuit design features a simple yet effective configuration that enhances its sensitivity, making it suitable for various applications. The circuit typically includes key components such...