i built my own a while ago (before discovering that i lack of affinity for digging or spending significant amount of time). found nails, coins, remains of a cup about two feet deep. was very proud of circuit performance but was quite disappointed with the experience.

can you post schemetic?

 

What was wrong with this thread?

https://forum.allaboutcircuits.com/threads/gold-detector.156752/

 

can you post schemetic?

So you want a schematic to a device that has poor performance?

 

What was wrong with this thread?

https://forum.allaboutcircuits.com/threads/gold-detector.156752/

Umm, note that’s another poster. Perhaps we’re seeing a competition to rush for the gold.

 

Incorrect.
https://md-hunter.com/list-of-countries-where-metal-detecting-is-allowedbanned/

Why would metal detectors be illegal anywhere? What is the reasoning?

I did a search an found this.

The reason for these restrictions is a fear that looters will remove archaeological objects without documenting their find spots.

Pretty poor reason to outright ban them. Restrict use I don't have a problem with that.

The only thing I could think of (for some countries anyway) is people stomping around digging up the countryside and possibly digging up landmines.

 

Umm, note that’s another poster. Perhaps we’re seeing a competition to rush for the gold.

I think they are the same person. Posting style and subject matter too similar. Two brand new users coming to the site to discuss gold detection? If that happened then you better watch out for lightening tonight.

 

Metal detectors were illegal for civilian use in Thailand and may still be illegal.

 

You could get bursts of 13kW from a battery like this.
https://www.amazon.com/Gens-ace-500...o&qid=1550008577&s=gateway&sr=8-1-spons&psc=1

22.2V*5AH*120C(burst rating)=13320W

A ton of power helps...

 

Attached is a paper describing an impulse radio geologic survey system with a peak power of 14 KW that is battery powered and can see through glaciers to a depth of 825 meters. Since the pulse duty cycle is low the average power is only about 1 watt.

A web search using the first sentence of the attached paper brought up many similar articles.

Impulse radars were introduced to glaciology by Watts
and others (1975) and have now become the preferred
instrument for ground-based depth sounding of glaciers.​