Whites Surf PI schematic

[paku]

Yea bro lol,Today i go outside from home for test its working perfect

bro do you fix using scope or using sand scope ? hakhakah

[seadoggy]

NO bro WE NEED SCOPE BRO TO **** (FIX) THE BOARD HAHAHAH

Yea bro lol,Today i go outside from home for test its working perfect

[paku]

Lol bro i put trim pot and find best value of damping resistor and check value of that trim and change with close resistor!,i also used Mylar foil from block capacitor work great did not lose sens

NO bro WE NEED SCOPE BRO TO **** (FIX) THE BOARD HAHAHAH

[seadoggy]

You will need scope , it makes a big difference ? HAHAHAHAHAAHAH

Lol bro i put trim pot and find best value of damping resistor and check value of that trim and change with close resistor!,i also used Mylar foil from block capacitor work great did not lose sens

[paku]

You will need scope , it makes a big difference ? HAHAHAHAHAAHAH

[seadoggy]

Looks goods, but i suppose with massive alu foil schield you will loose sens.
Try to use shield foil from ftp Network cable, mix graphit powder with clear laquer (simple and cheap graphit paint)

I will try use foil from block capacitor that foil is very thick!
If i use graphite what resistance must be??

[bernte_one]

Looks goods, but i suppose with massive alu foil schield you will loose sens.
Try to use shield foil from ftp Network cable, mix graphit powder with clear laquer (simple and cheap graphit paint)

[seadoggy]

This is my Surf PI.
Coil is 0.350mh size 25 wire 0.50
Coil dont have shield!!,next coil i make with ALU foil and see what will happen.

[homefire]

That seller does not ship to the USA. I have one of these does what I need to the most parts for Detector work. For the price it works good. http://www.banggood.com/DSO138-DIY-D...-p-984002.html

[soverey]

I dont have scope mate!is it possible with out scope?
I make coil 0.350 mh! size 25cm.Wire 0.60
Gold ring detect about 23cm in air test

You will need scope , it makes a big difference , http://www.ebay.com/itm/HANTEK-6022B...8AAOSwHQ9WX-VE

[seadoggy]

Not sure who to give credit to on this one ? Qiaozhi ?


Try this damping resistor adjustment tool:
10k pot in series with a 200R resistor, and a 2k resistor in parallel with both the pot and resistor. This will give you an adjustment range from 181R to 1672R.
Attach your oscilloscope to the output of the preamp, and adjust the pot until you achieve critical damping. Disconnect the adjustment tool and measure the final resistance. Replace with a fixed resistor that has the closest value.

I dont have scope mate!is it possible with out scope?
I make coil 0.350 mh! size 25cm.Wire 0.60
Gold ring detect about 23cm in air test

[seadoggy]

How did you solved the problem with false sound, when swinging the coil ? , did you adjust the width of the earth sample? ( just curios )
You can find the best value of the damping resistor for a certain coil by using a variable resistor instead of the fixed one,(search damping tool on the forum) and looking at output of the pre-amplifier on the scope.

I make board with error inside!!I hook up coil then i get ZERO(0) volts at NE5534 pin 6

[homefire]

Not sure who to give credit to on this one ? Qiaozhi ?


Try this damping resistor adjustment tool:
10k pot in series with a 200R resistor, and a 2k resistor in parallel with both the pot and resistor. This will give you an adjustment range from 181R to 1672R.
Attach your oscilloscope to the output of the preamp, and adjust the pot until you achieve critical damping. Disconnect the adjustment tool and measure the final resistance. Replace with a fixed resistor that has the closest value.

[soverey]

How did you solved the problem with false sound, when swinging the coil ? , did you adjust the width of the earth sample? ( just curios )
You can find the best value of the damping resistor for a certain coil by using a variable resistor instead of the fixed one,(search damping tool on the forum) and looking at output of the pre-amplifier on the scope.

I solved problem when i SWING with coil make false sound!!,I have fix that!Now its working well.
What is best coil size and Inductance?
And how set best dumping Resistor?

[seadoggy]

I solved problem when i SWING with coil make false sound!!,I have fix that!Now its working well.
What is best coil size and Inductance?
And how set best dumping Resistor?