Arduino metal detector?

[bernte_one]

Hello Foxy, are you interested to layout a Arduino shield pcb?

[FoxyLab]

Hello Foxy, are you interested to layout a Arduino shield pcb?

Hi, bernte_one!
My english is bad.
Transformation MD circuit to Arduino shield?

[6666]

Yes, fragments of mortar shell (IMHO german 81,4 mm).

[FoxyLab]

[bernte_one]

Hi, bernte_one!
My english is bad.
Transformation MD circuit to Arduino shield?

yes a simple stick on pcb, where you can stick the arduino nano direct on with the pin headers, so that there are no loose wire all around

[6666]

yes a simple stick on pcb, where you can stick the arduino nano direct on with the pin headers,

That could be a good project Bernte_one, I will order a Nano off ebay today and you could share the file on OSHpark, thats shaping up to be a good way to share PCB's, pity you have to order 3 pcb's from them, but if we put up our spares for sale that would be great for everybody.

[FoxyLab]

yes a simple stick on pcb

I want to try my circuit with the driver HCPL3120. I am waiting for the arrival of purchased chips.

[6666]

I want to try my circuit with the driver HCPL3120. I am waiting for the arrival of purchased chips.

Are you going to use it as a push pull driver for the fet ?
http://www.seekic.com/uploadfile/ic-data/200949124818615.jpg

[6666]

You can also do push pull with opto coupler like this
http://i.stack.imgur.com/gowYX.png

[FoxyLab]

Are you going to use it as a push pull driver for the fet ?

My current driver is too complex:

HCPL-3120 will simplify its.

[FoxyLab]

Using the laboratory bench, as a digital oscilloscope, I took a series of waveforms for my MD on Arduino.
The voltage on the search coil -

[bernte_one]

400V peak, look good
whats is the longest pulse you can produce without heating the coil driver too much?

[FoxyLab]

400V peak, look good
whats is the longest pulse you can produce without heating the coil driver too much?

I experimented with pulse durations up to 750 usec.
P.S. I got a chip HCPL-3120. My current MOSFET driver circuit:

[FoxyLab]

My current circuit for foxyPIv2 Arduino-based MD:
(description (in russian) - http://acdc.foxylab.com/node/47 )

[6666]

Thanks for update.