SBG-PID

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[waltr]

Tried recording EFE signal at amplifier out. Connected 8inch mono coil to my bench circuit and swung it while watching scope. How I swung the coil had a big effect on amplitude. Is it possible to swing the coil for no EFE signal? What has to happen to cause an EFE signal?

EF effect is due to moving a conductor through a magnetic field.

This is covered in Physics 102 so good place to search for the Physics answer details.

Basics:
If the magnetic lines of force are parallel to the conductor then moving the conductor will not produce a current to flow.
It is when the Magnetic lines cut across the conductor that current will flow if the conductor moves.
The maximum current flow for uniform magnetic flux and conductor velocity will be when magnetic lines are perpendicular to the conductor and reduce at smaller angles.

[green]

I completely forgot, there was a quiz question back in #151:

"This design may not need traditional EFE sample subtraction. Why? (This is a quiz question. Hint: the PI circuits in ITMD also did not have a late EFE sample, yet do OK without it.)"

C3 capacitively couples the decay signal to the preamp and provides high-pass filtering. EFE is a slower signal than a target response so it is possible to decently suppress it this way. Not as good as sampled-subtraction, which is also not as good as a bipolar design. I would suggest a bleed resistor added to C3. If not C3, then the HPF function of the integration stages will provide EFE rejection.

Tried recording EFE signal at amplifier out. Connected 8inch mono coil to my bench circuit and swung it while watching scope. How I swung the coil had a big effect on amplitude. Is it possible to swing the coil for no EFE signal? What has to happen to cause an EFE signal?

[Andi68]

Well, can you construct a better circuit and introduce it here?

[DonCaffeDelaSkobalj]

Another bulgarian rubbish in forum's room !!


Not similar like "supreme" bulgarian Pi design but has connection with pulse technolgies.

Let's read what Tesla had said about the "greatest" inventor Marconi.


Tesla:

"I may say that a lot of liberties have been taken. For instance, a man fills this space [break D] with hydrogen; he employs all my instrumentalities, everything that is necessary, but calls it a new wireless system?the Poulsen arc. I cannot stop it. Another man puts in here [referring to space between self-inductive lines L L] a kind of gap?he gets a Nobel prize for doing it. My name is not mentioned. Still another man inserts here [conductor B] a mercury[-arc] rectifier.....".

"If these men knew what I do, they would not touch my arrangements; they would leave my apparatus as it is. Marconi puts in here [break D] two wheels. I showed only one wheel; he shows two. And he says, "See what happens when the wheels are rotated; a wonderful thing happens!" What is the wonderful thing? Why, when the teeth of the wheels pass one another, the currents are broken and interrupted. That is the wonderful thing that happens? So, in this way, invention has been degraded, debased, prostituted, more in connection with my apparatus than in anything else. Not a vestige of invention as a creative effort is in the thousands of arrangements that you see under the name of other people?not a vestige of invention. It is exactly like in car couplings on which 6,000 patents have been taken out; but all the couplings are constructed and operated exactly the same way. The inventive effort involved is about the same as that of which a 30-year-old mule is capable. This is a fact".

[Carl-NC]

I completely forgot, there was a quiz question back in #151:

"This design may not need traditional EFE sample subtraction. Why? (This is a quiz question. Hint: the PI circuits in ITMD also did not have a late EFE sample, yet do OK without it.)"

C3 capacitively couples the decay signal to the preamp and provides high-pass filtering. EFE is a slower signal than a target response so it is possible to decently suppress it this way. Not as good as sampled-subtraction, which is also not as good as a bipolar design. I would suggest a bleed resistor added to C3. If not C3, then the HPF function of the integration stages will provide EFE rejection.

[6666]

Anybody made it yet?
Any video?
I am too busy in this period, unfortunately i can't have time to pay on this.
But i would really like to see if somebody make success with this detector.

Hi I have been trying but time poor, can your pcb file produce gerber files ? if we could get some pcb's made it would be good.

[ivconic]

Anybody made it yet?
Any video?
I am too busy in this period, unfortunately i can't have time to pay on this.
But i would really like to see if somebody make success with this detector.

[scs]

Tlc272 instead of tl062 also work well.

[ivconic]

Thanks a lot!
Bravo for spotting those!
Here is finally corrected:

[dbanner]

100% of layout has been checked. besides the two previous mentioned errors, I could find no more mistakes.
You say you are out of practice? Dam! That's nice layout.

[dbanner]

Ivca, I found another small omission on your layout. I refer to your schematic, capacitor C25(100n) which is associated with power supply op amp U5a. One end is not connected to anything.(should connect to B+) Another easy fix.

[ivconic]

Looks like someone else would like a Colt Cobra ...
[ATTACH]46198[/ATTACH]
You are not alone!
How suppliers often react to this ... [ATTACH]46199[/ATTACH]

These fakes performs even worse from what's noted in that article.
With these fakes was obvious from a start that something is going very wrong.
Output is dramatically attenuated, there is strange threshold present and occasional distortion.
Very big difference comparing to common TL071 behavior.
These fakes are total miss. If they wanted to fool somebody; they missed big time.

[ivconic]

Ivca, very good layout. Well done sir!
However, I have found one small error so far. I refer to 100x70.lay Sprint file. The 10K resistor to centre of sensitivity pot should connect to pin 6 of opamp. In your layout it is connected to pin 5. Thankfully, it is easy fix.
everything else so far is perfect. Just small part of layout remains to be checked.

Thanks!
Here is corrected:

[dbanner]

Ivca, very good layout. Well done sir!
However, I have found one small error so far. I refer to 100x70.lay Sprint file. The 10K resistor to centre of sensitivity pot should connect to pin 6 of opamp. In your layout it is connected to pin 5. Thankfully, it is easy fix.
everything else so far is perfect. Just small part of layout remains to be checked.