Delta Pulse

[Geo]

First test with 16 turns no good. I will come back again with second test with 30 turns.
Bye

[ma330]

sniffer xr71

hi to all
i want build sniffer xr71 .but i have many question. any one can please ask to me.
can sniffer breekup between metals for exampel .: between gold and other metals????????????

2. can i build larger search coil for sniffer . exampel 1meter in 1meter?????

3.sniffer is sens to small object like( coin) whit large search coil?????????

4. max depth detect whit search coil 40cm ????????

5.have sniffer constant in ground effect????

tank you.

[Geo]

hi to all
i want build sniffer xr71 .but i have many question. any one can please ask to me.
can sniffer breekup between metals for exampel .: between gold and other metals????????????

2. can i build larger search coil for sniffer . exampel 1meter in 1meter?????

3.sniffer is sens to small object like( coin) whit large search coil?????????

4. max depth detect whit search coil 40cm ????????

5.have sniffer constant in ground effect????

tank you.

Hi.
1. If you mean discrimination then No
2.Yes
3. With coil 1 x1 m No. No one detector with large coil is sensitive to small objects
4. Maybe 2 m
5. If you mean stability yes

[forst]

Hello I have been building Delta PULSE detector and I m a beginner. I dont know how works and how to cennect TR0, TR1, TR2, TR3, TR4, TR5, TR6, TR7, TR8, TR9. I didnt found this how to work. Please help me...

[diminute]

Replace

In the Deltha Pulse I can replace:

1 - LF 357 by LM318P or NE5534 ????
2 - TL062 by TL072 ???
3 - BC 546 by BC 548 ???
3 - BC 557 by BC 558 ???

Please awnser me these questions, and thank...

What's is the final version of Deltha Pulse (schematics) ???

[Geo]

In the Deltha Pulse I can replace:

1 - LF 357 by LM318P or NE5534 ????
2 - TL062 by TL072 ???
3 - BC 546 by BC 548 ???
3 - BC 557 by BC 558 ???

Please awnser me these questions, and thank...

What's is the final version of Deltha Pulse (schematics) ???

You can replace transistors and TL062 but don't replace the LF357. If you want to experiment then try to connect pins for thermal offset and make bigger gain (replace R17):confused: . If you can not find the LF 357 then try NE5534 but not the LM318. I tried it without results. Maybe there was problem with IC ... i don't know.
As i know there is only one schematic for D.P.

[Mrand]

According to my experiments only LF357, LF356 and TL071 are working goodly at this configuration . Unfortunately NE5534 isn't suitable for Delta Pulse or Sniffer.
Mrand

[diminute]

ok

Les estoy muy agradecido, espero tener exito en mi nuevo proyecto... estoy seguro que con la ayuda de ustedes voy a lograrlo.

He oido decir que el esquema del Deltha Pulse presenta errores, es cierto o falso ???? yo tengo dos esquemas pero los veo iguales... creo que están en este mismo hilo del forum.


Saludos

diminute

English (Google)

Very I am been thankful them, I hope to be successful in my new project… I am sure that with the aid of you I am going to obtain it.

I have heard say that the scheme of the Deltha Pulse presents/displays errors, is certain or false? I have two schemes but I see them equal…

I believe that they are in this same thread of the forum.

Greetings

diminute

[Geo]

Hi. Schematics of Delta Pulse are OK. Try it.

[Geo]

According to my experiments only LF357, LF356 and TL071 are working goodly at this configuration . Unfortunately NE5534 isn't suitable for Delta Pulse or Sniffer.
Mrand

Hi Mrand. At Delta Pulse D5 is TL062 and at XR71 is TL072. I tried both without difference. Now i use TL072. So i believe that Diminute can replace TL062 with TL072.
Best Regards

[Mrand]

I was speaking for the Frontend OPAmp. He is working in the characteristic configuration ( "common +" ). They want only few OPAmps to work correctly. NE5534 and LM318 are very good (318 is faster but has some bigger noises). Unfortunately they aren't suitable for applying to this circuit.
Mrand

[diminute]

So good

Sorry for my bad english

Yes, is replace the TL062 by the TL072... I have this second op.

You said that 071 replace the LF357, I don't have 071 now but i have four TL081, is the same ??? I found that TL071 is aproximaty igual to TL081, with the only diferrence of it's Offset Current, but in the circuit of DPulse this parameter is not important.

TL081 = TL071 ?????

Thank

[diminute]

OK

I can replace TL071 by TL081 ?????


Thank

[hawk17966]

Dumper resistor?


Hi! I need help!
Can anybody explain me in details role of dumper resistor in this PI design?
How it affects on fet and coil?
How can i use less resistance coil(ex.2ohm or 3 ohm) without blowing up fet.
As somebody mentioned here, if coil has resistance less than 6-7 ohms than fet is getting very hot. Can dumper resistor help somehow?

[Carl-NC]

I can replace TL071 by TL081 ?????

Yes.

Can anybody explain me in details role of dumper resistor in this PI design?
How it affects on fet and coil?
How can i use less resistance coil(ex.2ohm or 3 ohm) without blowing up fet.
As somebody mentioned here, if coil has resistance less than 6-7 ohms than fet is getting very hot. Can dumper resistor help somehow?

The damping resistor dampens the exponential decay of the inductor. Without it, the inductor will ring. It does not affect coil current (to any extent). To reduce coil current, you need to add a few ohms of resistance in series with the coil.

- Carl