Mosfet switching time

[PierreJ]

I was making multiple pulse induction circuits using IRF9630 p-channel mosfet but the range is very low (couple of centimeters for 10*10*10 cm hollow iron cubes), even after trying multiple coil designs and 3S lithium batteries
I suspect the problem is that the mosfet doesn't cut the current...

[anil.berk]

Hi I am trying to build MPP REV E step by step. It seems okay to me until I reached step 8.

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Step 1: Check U3 pin 4 for -5V

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Step 2: Check TP7 for +5V

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Step 3: Tx driver pulse
I adjusted pulse period to 1 ms (1KHz) and pulse width to 100 us approximately....

[antalaz]

Hi all,

I've got problem with a Sovereign GT.

At the beginning, the sensitivity pot was swifting the treshold setting. By increasing the sens, the treshold became unreachable.

Got rust on power supply connections, I've cleared it by resoldering, and now everything...

[OCBSlimz]

Hi Guys,

I have been repairing Garrett Pro pointers for a while now and have come across many problems including the common ones, falsing, broken switches etc.

I was recently sent a pro pointer that behaves differently. Upon switching it on it gives a buzz and a hum from the...

[omr255]

Hi everyone!

I am new to this forum so please let me know if I do anything wrong.

I have bought a barracuda rev a set from silver dog and I am having some problems getting it to work. It seems as if half the board is not recieveing power as the speaker/buzzer has 0v on...

[antalaz]

Hi everyone !

I've managed to build a Surf Pi from Silverdog' kits.
It's working quite good (it can detect metal, so the main function is ok I think )

I would like to setup my damping resistor and my delay,so i made some research on the forum and i've found a post...

[Psyborg]

I built baracuda from silverdog with original parts. I turned on and nothing happens, not a sound, not a beep. I noticed that the IC 7760 very warm. So I look all components and discovered that is IC LF412 is wrong inserted. After correction the heat of 7760 is gone. But still no sound.
I use...

[mellao]

Hi,
this is my first post, so I would like to talk about me and my problem
I'm Carlos (mellao), from Spain, and I'm a little noob in this metal detectors world
I bought a surf pi 1.2 from silverdogs and I build it, and check the components a lot of times and it seems to be OK....

[HeatSink]

Hi everyone,
I recently finished my Hammerhead Rev D PCB, but I encounter a very annoying problem. My Hammerhead has a very high audio-frequency when no target is detected. Since I am new to the world of metal-detectors I don't know if it this is normal or not. I followed the instructions on Carl's...