Surf PI Pro

[Carl-NC]

If the red soil is highly mineralized then you need a PI with ground balance capability. The Surf PI does not have this.

[ZOUjiarui]

No, the pirate test is better than it. The translation software misunderstood my meaning, and I don't understand English.：哈哈：

[ZOUjiarui]

Did I not debug it well? Don't know why it's so bad

[ZOUjiarui]

Dear Masters, my Surf Pi PRO could not work on the red soil. It could not be stable on the dry soil wall. It was unable to use. It has been disturbed by red soil, the sensitivity is toned to the smallest, but it is not almost detected.To metal, its effect is better than the simplest pirate PI

[Qiaozhi]

加个微信13970800524

English?
I doubt many people here use WeChat.

[yhl]

加个微信13970800524

[Emersonpaz]

If there is no contact with the board, there is no need for insulation between the transistor and the heatsink

[GeoMax]

See some sample pictures here...

[GeoMax]

Hi ZOUjiarui,

I do not see the PCB solder side and don't know how your heatsink is connected (or not connected) to the circuit. But between the MOSFET and the heatsink is an electrical isolation missing. Usually there is a Silicon pad and a srew isolation mount between the MOSFET and heatsink.

[ZOUjiarui]

Added a photo of my work

[ZOUjiarui]

[ZOUjiarui]

I had mistakenly removed the 1k fader and added a lead, which caused the bc517 to burn out. Thankfully, it worked again with the 1k resistor

[ZOUjiarui]

The short distance of the detector is entirely due to the fake chip.

[ZOUjiarui]

There is a little problem with my circuit. The irf9640 is a little hot. I added a heat sink.

[ZOUjiarui]

Clarify my mistake
There's nothing wrong with the circuit. It's working.