@kampen 

Ok dear friend, here is the measurement of the Sequential Coil Group #1...or Vcoil across coil.
Is better on a video, so you can see the "unstable" (Fluctuating) Voltage, meaning it does not just "Flash" a steady V-Level then should go OFF (because at least ONE of the END Coil got disconnected), then the Next Group on the Sequential order would be ON.


Regards

Ufopolitics

@kampen

Ok, dear friend,

Now I have connected Both Input Probes to #1 Terminals (-/+) and we can see the Vertical Alignment between both channels are perfectly fine, aligned.

As at lower frequency, when Ouput Power is ok, bulb is lit, basically the Positive Channel (Magenta-Purple) keeps a Horizontal Line...

BUT, as soon as I start rising frequency, the Positive Channel starts making this "WAVE" ...(the Blue or Negative Channel keeps straight or in a Horizontal Line, NOT making this "wave")

This is when Output power is OFF.


Resuming, that we can RULE OUT the "Offset" issue...the channels are in sync. ..

Cheers and Thanks again for your help!!

Ufopolitics

Reply to message #520 
@ Ufopolitics,

What you are describing for Vcoil across a sequential group actually sounds very typical for an inductive load when one end (or both ends) is not held to a defined state during the OFF or handover period.

A coil will not behave like a logic signal that just "flashes" on and off.
When a group is turned OFF, the current still wants to continue flowing, and if there is not a clear recirculation / flyback path, the voltage will ring and fluctuate instead of dropping cleanly to zero.

That often looks like instability on the scope, even though it is just the inductor reacting normally.

A good next check would be:
confirm how coil current is handled when a group is OFF diode path, synchronous recirculation, clamp, etc.,
and whether the coil is ever left floating during sequencing.

If you can share how the OFF state is implemented for a group, it will be much easier to tell whether what you are seeing is expected behavior or a wiring/topology issue.

You are now definitely past the "measurement artifact" stage now and this looks like normal inductive behavior that just needs the right current path defined.

Regards, Alex

Quote from: kampen on Dec 27, 2025, 05:54 PMReply to message #520
@ Ufopolitics,

What you are describing for Vcoil across a sequential group actually sounds very typical for an inductive load when one end (or both ends) is not held to a defined state during the OFF or handover period.

A coil will not behave like a logic signal that just "flashes" on and off.
When a group is turned OFF, the current still wants to continue flowing, and if there is not a clear recirculation / flyback path, the voltage will ring and fluctuate instead of dropping cleanly to zero.

That often looks like instability on the scope, even though it is just the inductor reacting normally.

You are completely right!...the "OFF" Period is kind of "uncertain" if we do not make the right path(s) for the current to recirculate.
Agree there 100%
Plus, we also have the fact that everytime a coil is disconnected after being powered, the Voltage REVERSES...so, another "issue" to address.

Quote from: kampen on Dec 27, 2025, 05:54 PMA good next check would be:
confirm how coil current is handled when a group is OFF diode path, synchronous recirculation, clamp, etc.,
and whether the coil is ever left floating during sequencing.

Definitively!

Quote from: kampen on Dec 27, 2025, 05:54 PMIf you can share how the OFF state is implemented for a group, it will be much easier to tell whether what you are seeing is expected behavior or a wiring/topology issue.

Well, basically I was looking at the 'GROUP' of Coils as a CIRCUIT, and as you have mentioned before...it does not behave as simple as that.

If we are measuring the Voltage across a Group of Coils in Series (look at it like a 'circuit'), and -at least- one END Coil gets disconnected (Circuit is OPEN at one end), then that V-Measurement should either drop to zero (less probable) or flash a Negative sign on the meter (voltage reversal)...

However, the MAIN POINT here is that : "if that Group of Coils gets disconnected from our driver, and still - the disconnected coil- remains with power...then the "FIELD MUTATION EFFECT" is VOID...and so we will not get the FULL Displacement of the Field...and there would not be a Solid Induction to Output...that simple!

Quote from: kampen on Dec 27, 2025, 05:54 PMYou are now definitely past the "measurement artifact" stage now and this looks like normal inductive behavior that just needs the right current path defined.

Regards, Alex

I still want to test the Version 2, I have some hopes, it will drive it better than V1...let's try and see.

Plus, now I am even more inclined to building a Dual Brushed Rotary Switch...which, I can "hand turn its shaft" and see in "slow motion" the behavior of the system., while connected to all possible tools/instruments.

A Dual Rotary Switch, where brushes will NEVER get separated from commutator or even get 'loose' (forced by centrifugal rotational forces) and that can reach the 3000 to 3600 RPM's...is the BEST GUIDE to address and STUDY every single detail about "what's going on here"...

Regards  and thanks again for all your help.

Ufopolitics

Hello All,

Hello my dear friend Alex...

I am very sorry to "drop off this bomb" specially on Holidays Season...but the Version 2 with Overlapped Function works much worst than the previous version #1.

To the point it does not even turn on, just a little bit, just the filament red...the 12V light bulb...

I made a video about the testing:


And so, I will repeat the TWO MAIN CAUSES this Drivers are failing...

1- ALL 15 Sequential Coils are ON at ALL Time. (There is no "sequence" here)

2- Due to the above #1, a FULL INPUT SOURCE POWER is NOT delivered for each Group on a timely basis.


In my -not much, really- knowledge about deep electronic design, this may be due to two possible causes:

1- Logic Board keeps 'leaking' power to ALL Gates of the FET's.
2- There is a 'leakage' from Source to Drain on  ALL FET's that keeps the Drain Supplying Power at all times. (this fault, I consider it very "odd" that it could be)

I may be wrong about the two possible issues above on electronics...BUT, what I KNOW I am NOT wrong...is that there should be a TIME OFF for ALL the rest of Groups while just ONE Group is getting Power.

And we could easily see this 'Time Off' clearly at very low frequency run.

Again, we need to see a Negative low power sign, or a very low voltage instead of OFF Time, like 0.5 or 0.3...or so a very low because of Inductance Storage...or Reversed Voltages...

But we have ALL Sequenced Coils ON at ALL Times...yes, "fluctuating" from 11V to 30V...passing by 22V or 17V...It is definitively not going to work with these results.

There is absolutely NO SEQUENCE PATTERN HERE...

So...we do not get a REAL Output...not even a "decent" one.

I am sorry about this bad news...but we will make it work...one way or another.

Again, I am sorry Alex, my friend, you and your team had work on this boards so much!!...dedicated so much time and money...


Regards everyone.


Ufopolitics