complete project Circuit diagram

[Tinkerer]

and more
I have built it partwise. Some results what I could do on youtube.

It was experimentell with a lot of potential, but I had never a completed detector.

These designs had a problem with the inrush current, because there was no inrush current limiting. Under certain conditions this could blow the mosfet gate.

[mschmahl]

more...

[mschmahl]

more video

[mschmahl]

and more
I have built it partwise. Some results what I could do on youtube.

It was experimentell with a lot of potential, but I had never a completed detector.

[mschmahl]

Tinkerers schematics

I have some of the schematics, but don´t know how new they are. If I remeber right, than this are the original schematics of tinkerer.

[Davor]

I remember some of your newer schematics containing balanced mic preamps, INA and THAT, so there must be some newer stuff. Perhaps you could find those in your attachments on this forum. I did it for my attachments previously. It works only for the files you attached to the forum, and not the files you linked from elsewhere.

[Tinkerer]

Tinkerer schematics

I found these 2 schematics.
There might be later versions. I am still trying to find.

[Tinkerer]

Dave's tutorial is nice but its for coplanar coils, I was thinking to create a 2D.
There's an old post where you describe your experimental 2D coil with bucking coil
The bucking coil looks to be ~3cm diameter (hence my 15cm long wire) and placed mostly on the RX side

correct

[waltr]

Ahhh... 2D = DD
Correct, no bucking coil needed. On the classic DD adjusting the 'over lap' Null the coil.

Tinker's small loop is fine adjustment after 'course' adjustment with the over lap.

[eclipse]

Dave's tutorial is nice but its for coplanar coils, I was thinking to create a 2D.
There's an old post where you describe your experimental 2D coil with bucking coil
The bucking coil looks to be ~3cm diameter (hence my 15cm long wire) and placed mostly on the RX side

[Tinkerer]

I'm using TINKERERS_V1_002-12-13-2009
I have not used a ground plane, I may have problems with the inrush current, I did add few things for soft switch, don't like the sparks when switching on.
Nevermind all that it's just a proof of concept board, I'm more worried if it will fire at all and about the coil construction. I will try building a 2D coil:
28cm coil former, 1mm2 litz wire 300uH for TX, and for RX I can use 0.5mm2 enamelled copper single wire 180uH+180uH;
for the the bucking coil 1x15cm long wire same wire as TX in circular shape
The TX wire will have no more than 0.4R-0.5R resistance.

The 1x15cm loop is only for fine adjustment. You still need the bucking coil. Better read David Emery's instructions again.

[eclipse]

I'm using TINKERERS_V1_002-12-13-2009
I have not used a ground plane, I may have problems with the inrush current, I did add few things for soft switch, don't like the sparks when switching on.
Nevermind all that it's just a proof of concept board, I'm more worried if it will fire at all and about the coil construction. I will try building a 2D coil:
28cm coil former, 1mm2 litz wire 300uH for TX, and for RX I can use 0.5mm2 enamelled copper single wire 180uH+180uH;
for the the bucking coil 1x15cm long wire same wire as TX in circular shape
The TX wire will have no more than 0.4R-0.5R resistance.

[Tinkerer]

which schematic are you using?

Do you have a ground plane?

You might have to add an inrush current control.

[eclipse]

I'm using Diptrace 3 which is by far the best.

The board is fully finished now and it will go into the fab for manufacturing as soon as If find one more hour to recheck for errors. Board sizes are 145x100

[Tinkerer]

Looks good,what ECAD are you using?