Sandbanks

[Qiaozhi]

Yes bat yours is old version with tako 87bx135 (that is imposible to find). On this forum is modification without them (shem, plasment, pcb and picture), you can go and see ...

The site you linked to needs a username and password.
Can you post the modifications here?

[ivconic]

Yes bat yours is old version with tako 87bx135 (that is imposible to find). On this forum is modification without them (shem, plasment, pcb and picture), you can go and see ...

Look up! Post #34 by Qiaozhi!
Where do you see toko transformer?
It is the "new" version that Qiaozhi posted already.
I made it. Working pretty good.

[konan]

Look up! Post #34 by Qiaozhi!
Where do you see toko transformer?
It is the "new" version that Qiaozhi posted already.
I made it. Working pretty good.

That is Polish version on www.skrivenoblago.com is Serbian version, there you can find more cool staff about making metal detectors...

[maikl]

Here are pictures from the forum a "skriveno blago". But I have a question for those who have tried Sandbanks: what is the smallest nugget of gold (for example 1 g -3 g...) capable to detect (in soil) and at which depth?

[Orbit]

2 switch with high sensitivity mode without clock, as soon as it senses metal immediately report such to the subject builted be just below the probe regardless of the distance Item ,tremendous sensitivity and very small objects.

[Orbit]

The only mistake in the semi transistor 5 is a 2n3819 2n3820 transistor 7 is

[strujas]

Corected schematic

[maikl]

Here are some Sandbanks modified with Polish Forum. The PDF has more details

[Davor]

This seem as a nice PI to start with

[homefire]

The original had a Transformer that you had to wangle.

Here is the English version of the same I think.

[6666]

Homefire I don't think that's the correct file

[mikebg]

Homefire I don't think that's the correct file

That's also not the correct design. Homefire shows an old project of Mark Stuart published in 1989. There is a more new design by Mark Stuart, published after 5 years:
http://www.geotech1.com/cgi-bin/page...art2/index.dat

[homefire]

That the one using the transformer Voltage pump.

No one was able to fine the right transfomer but a Yellow IF transform works.

[6666]

Homefire please look at the file you posted its not the sandbanks with the transformer

[homefire]

I know that one has no transformer.

I was thinking that was the newer one.

OOps!