The kit contains more transistors than needed so after building an testing i now have some extra transistors. An instruction manual or schematic was not included. Information which components to place where was on the PCB
I included a photo of the front and back of the PCB.
After assembling i powered the metal detector using 3 1.5 AA batteries (= 4.5V). This metal detector seems to work better than the one in my Metal detector -1- blog post. This second metal detector only has a buzzer. not an led. See picture below. It only gives a signal when metal is near the PCB. (It is possible to create a (false) signal by moving the batteries and battery wires near the detection coil. The pot meter can be used to adjust the sensitivity.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh_Qr4OFW4RWxuehFfHisW3aRWN9tZJ2OJYhroWap4mSTHjyerzmfY2GCPvLMCFsgpmT99EJF4rXZwPDcZzM1yfyriQBu08hSPASk_jUzSKZ8DDQ-1NqNui2S3762NZJHyA7hfZJAhcTr0x/s320/20200920_164239.jpg)
Perhaps, some time, i also build a metal detector using the 555. However i am also working on other projects and received some PCBs and other components for these project. And for now i have a nice working metal detector so i want to give priority for these other projects.
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