Classic DeltaPulse in new SMD revision

[StarShina]

And if you are familiar with this, the engineer does not change one for another because the second is lying in the trash.
The engineer changes one component to another for a specific reason.
So I asked what your reason is, and you show me your trash.

[kt315]

I smile.
---
I am too. i did not yet meet so much obstinate guy in the forum. my technical skill is tech university.
what is your?

[StarShina]

I smile.
---
I am too. i did not yet meet so much obstinate guy in the forum. my technical skill is tech university.
what is your?

my education is a technical university too.
What's next?
As the Russians say-'davay merat'sa pipiskamy? :-) :-) :-)
Or what can you say about tantalum capacitors, why are they in the DeltaPulse?

[StarShina]

By the way, a new revision of PCB is already ready.
Of the features:
-placement of components only on the upper side
-improved placement of components and connections between them
-improved power supply scheme
-three resistors on different coils
Job1.PDF

[Teleno]

By the way, a new revision of PCB is already ready.
Of the features:
-placement of components only on the upper side
-improved placement of components and connections between them
-improved power supply scheme
-three resistors on different coils
[ATTACH]55318[/ATTACH][ATTACH]55319[/ATTACH]

Do you solder all that by hand? If so perhaps you can share your technique, I find SMD daunting.

And if you are familiar with this, the engineer does not change one for another because the second is lying in the trash.
The engineer changes one component to another for a specific reason.
So I asked what your reason is, and you show me your trash.

The main reason for using SMD components is a reduction in size. Tantalum caps are much smaller thal alu for the same capacitance, so that is probably the reason.

[StarShina]

Yes, I solder by hand, I think there is nothing frightening or surprising here. A good tool, a soldering iron, a microscope.
For example:

[eclipse]

Do you solder all that by hand? If so perhaps you can share your technique, I find SMD daunting..

Soldering SMD by hand is easy. Use your soldering iron to put some solder on just one of the pins (for example a resistor). Then hold the element with tweezers and with the soldering iron melt the solder while placing the element with the tweezers, press down well to the board and adjust the proper angle. Then solder the other pin.

I solder chips in similar way. Lately I've been working with PIC32 and those have very fine pitch 64 pins which are a bit pain to solder. I use similar technique, and I found out a good way to avoid shorts on the fine pins.
I use alot of soldering paste /flux/ and solder braid which you gently rub the pins so all excessive solder is gone and also it makes very good contact /no cold joints/..

[kt315]

my education is a technical university too.
What's next?
As the Russians say-'davay merat'sa pipiskamy? :-) :-) :-)
Or what can you say about tantalum capacitors, why are they in the DeltaPulse?

try to understand. it's easely. https://habr.com/ru/post/146987/

[dbanner]

Delta pulse is small PCB, still is good practice for bypassing, not sure if it make any significant difference to overall performance for Delta pulse circuit. Tantalums for delta? Oooohh, sure, why not, especially if you scrapped them for nothing from trash technology. As for tantalums on fire as was mentioned previous? I wouldn't mind seeing that. Heh heh.
However the topic of bypassing/decoupling is quite extensive and can become a study of complex analysis and expert knowledge and training. It is absolutely critical aspect of PCB design.( Think of those large boards with a gazillion chips BGA's FPGA's etc.)
This link looks to be basic nuts and bolts info.http://www.interfacebus.com/Design_Capacitors.html

[dbanner]

In military and space applications, only tantalum electrolytic capacitors have the necessary approvals. The other types don't.
So if you plan on taking delta pulse on next mission to Mars, heh heh.
But they do explode violently if reversed. https://m.youtube.com/watch?v=XgKLIvEIl4U

I don't think I've ever seen a niobium oxide capacitor. That's new for me.

[dbanner]

I have a trash board with a lot of these little black capacitors, seems they might indeed be nobium oxide capacitors. They are comparable to tantalums within certain voltage and capacitance ratings.
https://en.m.wikipedia.org/wiki/Niobium_capacitor

[kt315]

that's new for me. thank you. tantalums are also black sometimes so how differ?

[dbanner]

that's new for me. thank you. tantalums are also black sometimes so how differ?

That's a good question.

From what I read, niobium capacitors we're limited to low voltages, no more than 6.3 volts to 10 volts max or so.
Vishay made them up until 2017, then stopped. So if you take vishay smd capacitors from 20 year old junk board, there is possibility they could very well be niobium, especially low voltage ratings of 6.3V.

Nowadays, seems only a company called AVX makes them and maybe some Russian company as well.

Tantalums material became scarce and very expensive in early 2000's, so for a few while, niobium came into fashion because the material was more abundant and cheaper.

From pictures on internet, visually they look pretty much the same.

[StarShina]

PCBs are ready.
I'm starting the assembling.

[StarShina]

The SMD components are already mounted.