Simple Russian PI detector Pirat

[rusrob]

Hello everyone, I've built a few versions of this circuit and found that the 4558, in place of the K157UD2, works very well. It produces crisp clicks and has excellent sensitivity. I don't have the K157UD2 on hand to compare the two, but from the videos I've seen showing the performance of this Soviet chip, I can say that mine is just as good in terms of detection depth. I used a 2.2M resistor for R11.

[gandolfi]

LM301 are expensive. I bought my K157ud2 from Lithuania on ebay. I would not recommend the TL082 Version because mine didnt work very well. Poor depht compared to the K157ud2.

K157UD2 nothing else. Or buy a Surf Pi Kit. You could buy a PCB from the Barracuda PI and the Parts from Tayda electronics. PCB + Parts is about 25-30 Dollar.
Or a complete Kit from Silverdog ( Silverdog.co.uk).

Barracuda has a good depht about 30 - 35cm for a Coin.

LM301 is cheaper than K157ud2 0.55$ on tayda https://www.taydaelectronics.com/lm3...8-lm301an.html

All the component of the pcb of hammerhead cost 6$ with speaker

[Hammerhead]

LM301 are expensive. I bought my K157ud2 from Lithuania on ebay. I would not recommend the TL082 Version because mine didnt work very well. Poor depht compared to the K157ud2.

K157UD2 nothing else. Or buy a Surf Pi Kit. You could buy a PCB from the Barracuda PI and the Parts from Tayda electronics. PCB + Parts is about 25-30 Dollar.
Or a complete Kit from Silverdog ( Silverdog.co.uk).
Barracuda has a good depht about 30 - 35cm for a Coin.

I tried very much to buy Brakoda From Silverdog But Mr. Andi refuses to sell it to me On the pretext that he is afraid to lose my money

[BKY1337]

LM301 are expensive. I bought my K157ud2 from Lithuania on ebay. I would not recommend the TL082 Version because mine didnt work very well. Poor depht compared to the K157ud2.

K157UD2 nothing else. Or buy a Surf Pi Kit. You could buy a PCB from the Barracuda PI and the Parts from Tayda electronics. PCB + Parts is about 25-30 Dollar.
Or a complete Kit from Silverdog ( Silverdog.co.uk).

Barracuda has a good depht about 30 - 35cm for a Coin.

[Andi68]

The pirate did not convince me, I used the TL078.

I mean, the pirate is too simple, better is for example a surf PI kit

[gandolfi]

I would not buy the pirate as a kit.

With only a few parts, it is quickly set up

I also built it, it did not convince me

- You are don't convince by the kit or Pirate detector ?
- Is it LM301, k1157, TL078 version ?
- What do you recommand also cheaper ans simple ?

Ask hammerhead for his layout. Its the one with the russian OPamp. This one is the best.
I like the Pirat Pi. Depht is 25cm with one Euro. 25cm coil. I use a smaller one 16-18cm and im satisfied.
Its good when i dont want to dig big holes.

- I can replace the k157 by the lm301 directly without making any other changes?
- Will that be as good?

[BKY1337]

Ask hammerhead for his layout. Its the one with the russian OPamp. This one is the best.
I like the Pirat Pi. Depht is 25cm with one Euro. 25cm coil. I use a smaller one 16-18cm and im satisfied.
Its good when i dont want to dig big holes.

[Andi68]

I would not buy the pirate as a kit.

With only a few parts, it is quickly set up

I also built it, it did not convince me

[6666]

[ATTACH]43349[/ATTACH]

Coil 26 cm 13 Turns Coil and Bronze 0,6mm

Thank you for the reply

[Arionas]

Hello Hammerhead, good videos thanks, could I ask you a question just to clarify two things, on the video you say the coil is 26cm but then with the ruler you say 20cm and also do you say that the coil has thirteen turns يتحول 13
is that correct ? thanks I hope google translates the correct word

Coil 26 cm 13 Turns Coil and Bronze 0,6mm

[gandolfi]

The two projects are very different, both easy to make, if you buy the ebay kit take special note of what the seller says about VT1 and make sure you get the legs correct.

- Have they the same performance (depth, stability, clear sound...)?
- What project do you advice (cheap, simple to build and adjust) ?
- they have many version and PCB of pirate. I don't know what is the best PCb and version (LM301, TL078....) ?

thanks

[6666]

Hello Hammerhead, good videos thanks, could I ask you a question just to clarify two things, on the video you say the coil is 26cm but then with the ruler you say 20cm and also do you say that the coil has thirteen turns يتحول 13
is that correct ? thanks I hope google translates the correct word

[6666]

- what do you think about this kit compare to lm301 or k157ud2 ?

https://www.ebay.fr/itm/DIY-kit-metal-detector-Pirate/223012059126

- what pcb and part list take for better performance ?
- what the difference with PICKINI (depth, esaier ti use or build...) ?

http://users.telenet.be/willaert/MD/pickini/pickini_en/V4/electronics.html

thanks

The two projects are very different, both easy to make, if you buy the ebay kit take special note of what the seller says about VT1 and make sure you get the legs correct.

[Hammerhead]

https://youtu.be/Daa7hiI_Svc

[Hammerhead]

https://youtu.be/Daa7hiI_Svc?t=58