Recently i did buy this cheap DIY metal detector kit at Aliexpress.
Here some pictures of the parts ant the assembly. Soldering the components was not very difficult. As i wanted to use the power screw terminals in another project i soldered two Dupont pins instead for the power. In fact is was a three pin male Dupont pin where i removed the middle pin. The two outer pins where at exact the right distance on the PCB.
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhPTiHOkoAjaUPUYuprFusumROnbEMlzlH3L6n3o_hAnPNJvlHTV25ZEge0kAxtyZhax0LAmYaEyddSLnpE7YD6h_lVuQQTDFLQoHG8SepC_T7p-kzDbWs5JG0Z3qn9mq87GcSgL0k1H2Pj/s320/20200828_105504.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiyRJ_Tgpbgrmb5DdylcTemH-AcEUtizU75y8SZys4fhI88ymHfuFdfZAw5Cpc-CXnrgwZbswaM8iU1OpNAFczxUiVUMAKXEJ-yJL89ssxEOLaT_lc83utXWJs3CuNTRJ-j3jc1g3SFbYP9/w181-h320/20200828_111144.jpg)
Below the circuit diagram for this metal detector found on the internet
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEh9zPVE1JrXfSLMeLmyuj08T0gy5PPUxMXhnKGj2A3TyCZ6qj1Qkb3y9NCVzrp0NzLNpP2luFfp5QViPakEMQ4tClgeL5XKG-o8Pga0OJYd9MIHiCldMDyE6pM0PQixTGPBYGcLH30liYmd/s320/MetalDetectorCircuit.jpg)
I did build and tested the device powering it with 3 1.5 volt batteries (=4.5V) on the Dupont pins. My device continuous gives a signal that changes a when near metal. Changing the pot meter gives a change in the sensibility.This metal detector continuous gives a sound. Don't know if this is due to an error or intentionally. I did not do much troubleshooting to see if it was due to an error made during building and if i could improve it as i don't like it.
This is part -1- of my post about a metal detectors as i also ordered another cheap metal detector and i want to compare them.
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