Excel in making a gold detector

How does this circuit work??

The transistor generates a radio frequency, and the accompanying timer creates a frequency that can be made equal to the frequency of the transistor through the resistance that is installed on the timer. Thus, the two frequencies go to the second transistor, which amplifies it and sends it to the second AISI 555 to enlarge the unified frequency as well, clarify it, and then send it to the speakers to show the sound . In this device, we will use, God willing, headphones or headphones so that the signal is very clear.

Now, if we look at the circuit, we know that it consists of 2 timers 555, and this timer consists of 8 legs. The first leg is always connected to the negative line of the circle, and the second leg is always connected to the number 6, and the number 3 is the output of the circuit results, which is the frequency. The fourth leg is always connected with the positive line of the circuit or pin No. 8. Pin No. 5 of the timer is often connected with a capacitor that is connected from the other side to the negative of the circuit. As for pin No. 6 of the timer, it has different states depending on the purpose of the circuit, and here we are talking about This is more clear and we say the following:

1- The first case is when the purpose of the timer is to amplify, so this leg is connected directly to the frequency to be amplified, and in this case a capacitor is not connected to this leg.

2- The second case, when the purpose of the timer is to generate a specific frequency, and here a capacitor is connected to this leg commensurate with the required value of the frequency.

As for man No. 7 for the timer, it has two cases:

1- When the purpose of the timer is to increase the frequency, then this leg is not completely connected and left as it is.

2- When the purpose of the timer is to produce a specific frequency, then this leg is connected to a resistance. This resistance is connected to the positive line of the circuit, and the value of this resistance is proportional to the frequency required to be produced.

Pin 8 is for the timer and is always connected to the positive side of the circuit.

This is a simplified summary of the timer's work in all electronic circuits.