SBG-PID

[Carl-NC]

U3a, U3b(OP1a, OP1b) topology little strange for PI. Can someone describe integrator stage?

It's a bandpass integrator, I don't think I've seen this used before. It is called a "multiple feedback bandpass filter," lots on info on the Internet. Be careful with opamp selection, the 20M feedback demands ultra low IB.

This serves the same function as an SAT stage after the integrator but with the advantage that large offsets won't rail out the integrator. A disadvantage is that you cannot clamp negative signals, commonly done in PI-GB designs. Actually, I say that without really thinking about it, maybe you can.

Also U4b(OP2) is unity gain inverting amp, overall effect is inverting integrator on one path and non inverting on the other path, correct? Discrim(meter) and GB pots for summing?

Since one side is inverted, the pot output is a subtraction. That's why there is an inverter.

[dbanner]

Irishman?, I always thought Ferric Toes was Welshman or Englishman.

[DonCaffeDelaSkobalj]

Hey all

Why do you spend money and life time on totaly unuseful project - Bulgarian Sand Banks ? I am out of text.

Wanna know how to make good, stabile design, deep searching MD with GB and auto FB desaturation circuit, study or better build some of best Pi in the world already posted at this forum.

But what for example?

All projects of Mr.Irishman Eric Foster and also from German EE which made original Pulse Star. There are also several interesting Russian projects and original Zed's SD2000.
Bets way to make superb MD is first make one same like original, then modify it according to your needs. All other projects including Bulgarian clones whatever PI or VLF are pettite string beans.

That's all.
Good luck

[Andi68]

Someone who is not able to explain technical information on his own circuit and give such a poor excuse.
probably he thinks I am not worthy of such information, never mind the other members of the forum who might be interested, I am beginner, otherwise I could do my own calculations on integrator stage.
Wow! That's pretty insightful.
I prefer to think that the real reason is your English is very poor(math is however, a universal language), and you speak just in the same way in which you draw your schematic diagrams(confusing, obfuscating babble). I don't blame you for not trying to elaborate on your little circuit. INTEGRATOR and MOTION AMPLIFIER will do.

I fully agree with you, dbanner

[dbanner]

Maybe you would like to explain how your SBG-PID does ground balance? Since your second sample is in the typical EF sample region.

[dbanner]

Here is how the TDI purportedly does ground balance

TX on for 100us
TX off, enter flyback
first sample delay 10us, take the Target sample
At the end of the Target sample, wait a short delay, take the GB sample
At the end of the GB sample, wait a long delay, take the two EF samples
Use a diff integrator to subtract Target-EF1
Use another diff integrator to subtract GB-EF2
Subtract A1*(Target-EF1) - A2*(GB-EF2)
Adjust A2 for ground balance

[dbanner]

Someone who is not able to explain technical information on his own circuit and give such a poor excuse.
probably he thinks I am not worthy of such information, never mind the other members of the forum who might be interested, I am beginner, otherwise I could do my own calculations on integrator stage.
Wow! That's pretty insightful.
I prefer to think that the real reason is your English is very poor(math is however, a universal language), and you speak just in the same way in which you draw your schematic diagrams(confusing, obfuscating babble). I don't blame you for not trying to elaborate on your little circuit. INTEGRATOR and MOTION AMPLIFIER will do.

[dbanner]

It is not a bad idea to know that I am not a teacher in electronics for beginner

[scs]

It is not a bad idea to know that I am not a teacher in electronics for beginner

[scs]

Integrator and motion amplifier.

[dbanner]

U3a, U3b(OP1a, OP1b) topology little strange for PI. Can someone describe integrator stage? Is this also bandpass or low pass filter? I see two feedback paths on each. Are they inverting integrator and bandpass filter? Also U4b(OP2) is unity gain inverting amp, overall effect is inverting integrator on one path and non inverting on the other path, correct? Discrim(meter) and GB pots for summing? The topology of the integrators are the distinguishing feature of this nimble circuit.
SCS can you give description and technical details of your integrators?

[dbanner]

PCB layout traced with Sprint layout creator.

[dbanner]

[ivconic]

...Ivconic - If you have the time and inclination, please go ahead and make it as it is. That's probably the only way we'll understand how much of it works as advertised.

Sure will do.
But i am struggling now with pcb. Already did draw 2 variants and both are total miss&mess.
Now am making third attempt...

[scs]

Someone might think that's better ...