Ivconic's Negative Ion Detector circuit

[ivconic]

Hi,
AFT 72005
"How discriminate gold ion from other ions with This circuit ? for example ,silver ion ,
water ion, And ….."
Huh! It is a question! Ask Carl ! He'll be delited to answer!
By the way, there is no way to discriminate type with this device only polarisation.
I am not sure that ions care their origin at all.Somebody claimed that, but I never
met such claims in my books.Anyway , that kind of device should cost over $milions !!!
(in that case mineoro is very cheap...bargain, you may say).

Geo,
You can test ionic detector very easy, by pointing it in
some older TV set. Almost is a rule that high voltage stage in older TV's is
"leaking", and producing a lot of ions !!! Simple and cheap test !
About op.amps....you already got answer from the others...
About gain, it is enough. Adding more gain lead You to risk of going "wild".
About bakelite feed-through capacitor...I don't think so.
"Can i detect iron or other metals with the ion detector..."

Good question...Ask Carl,than ask Dell...than decide.(I would bet on Carl!)
J Player

Most of Your remarks I agree!
"2. Is it desirable to have even higher voltage on the dish?"

No! It was crucial mistake on some previous designs ! Higher voltage may generate
some own ions, so You can easy colect them instead foreign ones, if everything
was not quite good adjusted!

"6. Final thought is a question for anyone who knows: The antenna signal
feeds into 2 op amps which send out a differential signal into the differential
amp. But these 2 op amps also have a 3rd op amp shown below in a feedback loop
on the lower of the 2 op amps. What is the purpose of this feedback loop? is it
only to create a delay that helps reverse the polarity of the lower op amp? Or
is it to also act as a filter for certain frequencies seen in the antenna
signal?"

As a filter for certain "frequencies" seen in the antenna signal and integral part of
second input, acting a huge role in common impendance....
Delay...maybe, I didn't think that way....very interesting!

FrancoItaly
"The 10K potentiometre to BC107 ..."

Preset the amplitude of signal.
TL081/082 ... I do not think so ! CA3130/40....maybe...709(MAA501)...maybe

"The first high impedance stage use bootstrap technique ..."
Absolutelly correct !!! Bravo Franco !!!
"I think that the differential amplifier only responds to variations of signal input,
when you move the instrument in different site, and like a "motion metal detector"
the 4K7 potentiometer is the preset "tuning". There is no need of retuning push."
Absolutelly correct !!! Again Bravo Franco !!! Come to think...are You posted
this project or it was me !? You understood everything much better than me!?
Great understanding! Bravo!
"The Led in input stage serves to visualize the battery charge..."
Led should blinks in the rythm of charging....good.

"...but I think is better to use a 78L06 for voltage stabilization with 1/2 LM358 used
as comparator + Led and to use the other 1/2 LM358 as oscillator instead LM555.."
Really not necessairly, but good idea anyway.
"I think we can use other types of transformers..."
Steady...other transformer...other characteristics! But transformer is easy to
obtain. Open some old modem and there it is !

Esteban
Good schematic Esteban. I was thinking to mod Classic III sound, I'll try this
your schematic and see. Thanks for posting it.

Best regards to all!