AMX RX

[Tinkerer]

RX_REACTIVE_FILTER_DIFFERENTIAL_01-27-2023 - Schematic.pdf
Here is part of an RX circuit that measures the power absorbed by the ground and the target.
Or we could say the REACTIVE signal during the Flyback.
C29 and C26 need to be of about double the voltage of the Flyback.

The circuit is very sensitive.

[Tinkerer]

AMX_RX_PREAMP_01-27-2023 - Schematic.pdf

Here is a tentative preamp. I did some real testing with this and a real CCPI TX, using an 8" DD coil.

ivconic, if you want to use the 037 opamp, take advantage of the opamp offset correction. I am interested to see what delay you can achieve with this opamp. Probably you need to reduce the gain in the first opamp and add gain later.

[David_1]

both coils AWG22 ?

[Tinkerer]

both coils AWG22 ?

For the receive coil I use AWG 30 wire wrapping wire. The resistance of the coil is about 7 Ohm, very little current.

I tried TX coils with AWG 22 magnet wire and a fishing line spacer between the wires. It works, but the interwire capacitance and resistance is a little higher.
Using genuine Litz wire we could probably go with AWG 24 wire as it has significant lower resistance due to the Skin Effect.

Insulated, AWG 22, 1x19 tinned wire is a good compromise for TX.

Lower TX coil resistance reduces the RX offset.
Thicker wire is heavier.
The weight of the coil is an important ergonomic factor.
Like always a compromise has to be found.

http://www.miscel.dk/MiscEl/miscel.html This is the very useful calculator I use for most coil calculations.

[ivconic]

AMX_RX_PREAMP_01-27-2023 - Schematic.pdf

Here is a tentative preamp. I did some real testing with this and a real CCPI TX, using an 8" DD coil.

ivconic, if you want to use the 037 opamp, take advantage of the opamp offset correction. I am interested to see what delay you can achieve with this opamp. Probably you need to reduce the gain in the first opamp and add gain later.

Roger that. I was just about to comment that you lost me with those components already.
Ok, more/less it is doable.
I am only not able to obtain the particular switch, DG419.
And AD8031... dunno what I can do about it too.
ADA4807 too...
Not possible to obtain those in local shops.
Come to think... I can only obtain passive components from the RX schematic!

[ivconic]

DG419LEDQ - SOP8, OK, I can solder that. Present on Aliexpress,
AD8031AR - SOP8, OK, I can solder that. Present on Aliexpress,
ADA4807 - MSOP8, NOPE I can't solder that. Present on Aliexpress,
...
Problem.
Headache.

...

The icing on the cake... I keep looking at the wrong schematic! I should have been looking at "RX_REACTIVE_FILTER_DIFFERENTIAL_01-27-2023 - Schematic.pdf"
Now.. double headache!


Given that now the Chinese are celebrating their new year and a series of other holidays and will not work
for a total of 43 days !!! (if I'm not mistaken) ... and considering how late the shipments from there usually are...
and considering that I'm not able to solder some components...
People, don't wait for me, because you will be waiting for a long time.
And the one who was waiting for Godot waited less.
You work if you have the conditions and I will just follow what you write.
Unfortunately... it is what it is.
If I redo the whole schematic with the components I have, which are mostly through-hole and outdated, they don't even have those specifications...
it won't work at all. What a waste of time it would be.

[Tinkerer]

DG419LEDQ - SOP8, OK, I can solder that. Present on Aliexpress,
AD8031AR - SOP8, OK, I can solder that. Present on Aliexpress,
ADA4807 - MSOP8, NOPE I can't solder that. Present on Aliexpress,
...
Problem.
Headache.

...

The icing on the cake... I keep looking at the wrong schematic! I should have been looking at "RX_REACTIVE_FILTER_DIFFERENTIAL_01-27-2023 - Schematic.pdf"
Now.. double headache!


Given that now the Chinese are celebrating their new year and a series of other holidays and will not work
for a total of 43 days !!! (if I'm not mistaken) ... and considering how late the shipments from there usually are...
and considering that I'm not able to solder some components...
People, don't wait for me, because you will be waiting for a long time.
And the one who was waiting for Godot waited less.
You work if you have the conditions and I will just follow what you write.
Unfortunately... it is what it is.
If I redo the whole schematic with the components I have, which are mostly through-hole and outdated, they don't even have those specifications...
it won't work at all. What a waste of time it would be.

When designing "state of the art" innovative products, it is recommended to accept the advice of the manufacturer "not recommended for new designs".
However, when I do quick mockups, I often use some 30, 40 years old parts that I still have in the "old parts box". Through holes that I can stick into the old breadboard.
I do not expect to achieve performance to beat the best in the world. I do it to test principles. To learn, to understand how the circuit works.
Like your LT1037 opamp, yes I still have some in the box. I remember when I bought them. So much better than the NE 5534. Same with the old switches, was it 4066?
4016 and 4017? (you can use them, just watch out for the drive voltage and PSU)
If you understand the principles of the functions, you can make it work. A bit slower, a bit noisier but in principle it works.
If I want to run a Flyback of 1000V, I need to be careful with the layout, the cable and all the little details. Really study the datasheets. But if you want to use a Mosfet rated for 400V you still need to read the datasheets, and change things accordingly.
Downgrading is relatively easy.
Improve over the best in the world does take a bit more effort, but it has been done since the very existence of humankind.

[ivconic]

I drew the schematic in principle.
Only now that I have placed each component one by one on the schematic by myself; I see how many components there are with precise values.
Very unusual and very hard to find.
Some values are impossible to find...at least in non SMD packages.
A large number of non-polarized capacitors have a "tremendous" value, and I must admit that I have not had the opportunity
to see such value in real life until now. 3uF...1.8uF...2.5uF... in common 5mm raster.
I fence myself off; I still don't know what the situation is with those values when it comes to SMD components.
Because I don't work with SMD, I did a little something, it's not worth mentioning.
I have to contradict myself again from previous posts; not only can't find the opamps from the schematic;
also it is impossible to find most of the passive components as well.
There are too many arguments against it... I'm very sorry about that.
But this approach is very far from "diy" and "hobby".
And I guarantee that the vast majority of forum members will not be able to do this.
I'm sure that hardly a few members will be in a position to reproduce all this to the end.
This is what I have repeatedly warned about in previous topics.
Tony, I'm very sorry, your work and effort is obvious, but this is a very "specific" assembly with many unusual and non-standard moments.
Here is my reproduction, I chose some components quite randomly. Purely to remain only as concept.
I took a 10v power supply just as an example, and divided it in the same way, the reference is the virtual ground,
and the real physical ground is connected to the minus.
Same as your schematic; just with a different logic when observing.

[Tinkerer]

What voltage signal do you intend to feed your ADC with?

This whole circuit is designed to work with +3.3V and GND and 1,65V Reference, so that it can be input directly into a 3.3V ADC.

It is designed to extract the REACTIVE signal only, DURING the 500V to 1000V Flyback.

What is it for? To measure the losses of energy caused by the absorption by the ground and the targets.
Why do we want to quantify these losses? With the CCPI, these losses need to be compensated.

[ivconic]

As I said, the schematic is principal, just to see if it can be converted into a through-hole variant with slightly older components.
The ADC I had in mind is 5v. But even so; this schematic will require revisions for 5V ADC too.
That's a minor problem.
A bigger problem is component values that cannot be found.
A trivial solution is to put 3x1uF in parallel and get 3uF, for example. What about the other values?
Too many values to "trim" like that.
And most resistor values are very tricky to "make".

[ivconic]

No, no... you are right, schematic I did is not making any sense at all.
Sorry.
I give up.
I am not in position to materialize your schematic, pity.
...
But than again; if you would be so kind as to make a video of how that circuit works, it would be very productive.

[Tinkerer]

No, no... you are right, schematic I did is not making any sense at all.
Sorry.
I give up.
I am not in position to materialize your schematic, pity.
...
But than again; if you would be so kind as to make a video of how that circuit works, it would be very productive.

Are you still working with 3D design and printing?

[ivconic]

Are you still working with 3D design and printing?

Yes, at this very moment I am adjusting sizes for XP Deus coil screw, nut and insert.


Last couple days I did several enclosures too.
You and others here can count on me to draw 3D enclosure and needed parts for this project, no problem.

[Tinkerer]

No, no... you are right, schematic I did is not making any sense at all.
Sorry.
I give up.
I am not in position to materialize your schematic, pity.
...
But than again; if you would be so kind as to make a video of how that circuit works, it would be very productive.

Do you know of any ADC with +/- 5V input that we could use?
Would it help if I redraw and simplify the RX ?

[detectormods]

Do you know of any ADC with +/- 5V input that we could use?
Would it help if I redraw and simplify the RX ?

https://www.analog.com/media/en/tech...s/623637fb.pdf

this is in the gold monster as the adc driver, diff to single line.