Metal detector with meter discriminating
#metal detection
#discriminating meter
#sensor circuit
#electronic measurement
#treasure hunting
#proximity sensor
#inductive sensing
#signal processing
#educational
#hobbyist
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proximity alarm circuit
Inverters U1a and U1b are connected in a simple RC oscillator circuit. The frequency is determined by the values of R1, C1, C2, and the internal characteristics of the integrated circuit. As long as the circuit is oscillating, a positive...
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...
Proximity-sensor
The SillOO series circuit input is connected to a capacitive field sensor, potentially utilizing a double-sided circuit board. Any induced voltage change on the plate is directed to the input of the peak detector section of the operational amplifier circuit....
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...
Metal detector 2
The metal detector described in the example can detect metal objects made of highly permeable magnetic substances. The circuit operates based on several components: a power circuit, a sine wave oscillator, a PLL (phase-locked loop) circuit, and a hybrid amplification...
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...
Metal Detector MkII
This project is an extension of Metal Detector MkI, demonstrating the detection of metal objects. It is the second in a series of circuits that allows significant experimentation, particularly for those with a Cathode Ray Oscilloscope (CRO) and various items...
Cheap Metal Detector Circuit
The working principle of this inexpensive and simple-to-build metal detector circuit involves mixing two equal frequencies, which results in a low-frequency interference.
The metal detector circuit operates on the principle of heterodyning, where two frequencies are combined to produce a new...
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...