Voltage of the Russian pirate metal detector
Knowing the voltage of the metal detector is very important in order to learn to repair and maintain the circuit if it breaks down, and from here we presented this video to you in order to benefit us with God first, and then it will benefit you, God willing
Where we started by learning about measuring the voltage coming out of the legs of the AISI 555, then we went to the resistors and measuring the voltage coming out of the resistors during operation, then we got to know the first micro capacitor, and we measured its voltage, and we also measured the voltage on the ends of the coil, then we went to measure the voltage of the AISI lm358 and the resistors around it Alessi.
We must mention that the value will change slightly from one metal detector to another, and it will also change from one file to another depending on the file used. It is important to know that the depth of the metal detector always depends on the size of the file used and the number of its turns.
The device consists of two parts, the transmitter part, the receiver part, and the signal amplifier
The transmitter: It consists of the AISI 555 as a basic piece in the device with the IRF740 mosfet. When the AISI releases a frequency, the mosfet picks it up, amplifies it to an excellent degree, and purifies it. Then this signal goes to the coil, and after the coil it is transmitted through the capacitor one micro to the receiving circuit.
Installing the timer 555 in the circuit: The first leg of the timer is connected to the negative of the circuit, leg No. 2 to leg No. 6, leg No. 3 to the MOSFET 740, leg No. 4 according to the circuit, and leg No. 5 is connected to a 10-nano capacitor, which is connected from the other side to the negative. As for leg No. 6, it is connected Connect it to man No. 7 through a resistance of 100 kilo ohms, and man No. 7 is connected to the positive through a resistance of 5 kilo ohms. As for man 8, it is connected according to the circuit.
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The receiver: It consists of the main piece, which is the AISI lm358, so it amplifies the signal and controls the number of frequencies to match it with the coil, then to the transistor accompanying it, so the amplification is done and the sound is shown when the metal approaches.
To see the circuit of the device, please go to this topic
The signal is delivered to a capacitor from 1 to 10 micro, which does its job with the frequency, then the signal goes through the capacitor leg to the AISI 358, so it performs the necessary amplification operations through two successive amplifications with the same AISI to balance the sound, then the resulting sound goes to a transistor to amplify the received signal We hear the sound
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