Radio metal detector in the field
Our circuit used here consists of the following:
First: The transmitter, which is the transmitter used in the Kafi metal detector, which in turn consists of two transistors for transmission, where the first transistor with the first coil sends an electromagnetic signal with the same value as the signal that the second transistor sends with the second coil, and we can control the frequency by means of a variable capacitor or two variable capacitors on Coils, this method consists of (2) transistors, (8) 104 capacitors, 220 micro capacitors, and (4) 10 kOhm resistors. Here, the radio is connected to both ends of one of the two coils to obtain the total frequency, and the other two ends of the other coil are connected to a variable capacitor to tune the signal.
Second: the future
The receiver here is the radio, as it is a receiver and a signal amplifier at the same time
It is a metal detector consisting of a simple transmitter of 2 npn transistors and two capacitors for each transistor, each of which has a value of 100 nanometers, with four resistors of 10 kOhm.
Each transistor oscillates when the circuit is connected to electrical power, and when there is a file on each transistor, it produces two similar frequencies and the same value, provided that two coils of equal diameter and number of turns are placed, and when the metal approaches any file, the frequency changes.
When the frequency of one of the files changes, there becomes a difference between the two frequencies with a certain value that does not exceed 7 kilohertz in most cases, which is an audio value or a frequency within the audible audio frequency, but it cannot be heard before going through the stages of amplifying this audio frequency.
Here we use the radio instead of the stages of amplification and put the two radio wires that we extracted in a previous stage on one of the files and try to synthesize it to get the sound and enjoy a distinctive metal detector
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