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Metal detector audio amplifier - BERNZWEIG; DAVID S.
https://www.freepatentsonline.com/4594559.html
Metal detector audio amplifier. An accessory device for use with a metal detector with means to amplify the low, barely audible audio output of the metal detector so that it can be easily heard with further means to dampen louder audio output signals causing those signals to be softer. BERNZWEIG; DAVID S. 1. An accessory device for use with a ...
Simple Metal Detector using CA3140 IC - Circuits DIY
https://circuits-diy.com/simple-metal-detector-using-ca3140-ic/
This circuit is working on the basis of a BiMOS operational amplifier IC CA3140 and can be operated at 9-12V. A coil is used to sense the presence of any metal around the circuit. After detecting a metal it sends an input signal to the op-amp IC. A 2N3904 transistor is connected at the output of this IC to drive the piezo buzzer and the Led.
Simple Metal Detector Circuit - Electronics Projects
https://circuits-diy.com/simple-metal-detector-circuit-electronics-projects/
A metal detector is a circuit that senses any metallic object close-by. These metal objects are very useful to detect the presence of any hidden object. A simple metal detector uses a 555 Timer IC. The Metal detector circuit is the mandatory part of the security. They use it to prevent any unlawful entrance of guns and bombs in public places.
BFO Metal Detector - Gadgetronicx
https://www.gadgetronicx.com/bfo-metal-detector/
The last stage of the metal detector is just a common emitter amplifier. This further increases the level of the signal to drive a high impedance speaker and allow the user to hear the beats in the presence of a metal object. This stage is not critical and you can replace it with an op amp amplifier as well.
Build Your Own Metal Detector with an Arduino - Projects
https://www.allaboutcircuits.com/projects/metal-detector-with-arduino/
For this metal detector project, we will be using an Arduino to process the oscillation signal instead of offsetting the oscillation with a second tank circuit. The Arduino will store the fixed frequency and continuously compare the incoming frequency of the detector circuit with the stored frequency (more on the Arduino program below).
Metal Detector Circuit with Diagram and Schematic
https://www.circuitstoday.com/metal-detector-circuit
Description. This is the circuit diagram of a low cost metal detector using a single transistor circuit and an old pocket radio. This is nothing but a Colpitts oscillator working in the medium band frequency and a radio tuned to the same frequency. …
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