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 71 
 on: July 20, 2020, 01:49:32 13:49 
Started by Resonantwin - Last post by Resonantwin
CountrySingapore
Note- Electronics engineer
- Can share Power engineering knowledge
- To discuss
- Hobby and Job

 72 
 on: July 19, 2020, 10:33:41 22:33 
Started by mars01 - Last post by pickit2
SketchUp Pro 2020 20.0.373 x64
SketchUp Pro 2020 version 20.1.235 64-bit


Posted on: March 08, 2020, 11:27:51 23:27 - Automerged

 Update new post is silent install

 73 
 on: July 19, 2020, 09:54:34 21:54 
Started by Bitfogav4 - Last post by Bitfogav4
CountryUnited Kingdom
NoteI am a hobbyist programmer in C, Basic, and Arduino, I also have a good understanding of electronics and electrical components.  
My day job involves testing vehicle electrics/electronics, and Even involves working on/with electrical vehicles.
I also make my own PCB using multiple PCB design software.
 

 74 
 on: July 19, 2020, 09:33:32 09:33 
Started by ajith - Last post by pickit2
at my place of work we moved away from 7 seg displays that used 7 pins plus 1 pin for each digit displayed.
we started using LCD displays 7 pins then we started using LCD and PCF8574 2pins.
the way the product developed at each stage there was better information displayed and the cost went down.
All of the above was in black and the option of a back light, and tried a few colour back lights.
Today they use TFT displays with so much for information to the user.
I think that's one of the reasons there is so many cheap 7 seg displays & driver chips on the Chinese market.
I even think in my old workplace stores there are still lots in there, mostly kept for repairing units out on sites.

so even a a hobby project I would use a TFT display, using 4 or 5 data & control pins.
and if pins are that tight use a Nextion display borrowed from the works storeroom.
 

 75 
 on: July 19, 2020, 07:41:49 07:41 
Started by ajith - Last post by bobcat1
The question that should be asked is : "what is more expensive to use 9 uc pins or 5(or less) uc(micro controller) pin's"
The answer is depend on what is the requested final result " whether you plan to manufacture 10000 pcs of a new device or system - cost is very important or you just going to produce few hobby PCB?

All the best

Bobi

 76 
 on: July 18, 2020, 06:38:58 18:38 
Started by ajith - Last post by Ahmad_k
I also use MAX7219 / 7221. Good availability and cheap, ready to use displays available. But where can you get the parts so cheap?  Shocked
We have multiple dealers in my country that import electronics from china.

 77 
 on: July 18, 2020, 02:32:30 14:32 
Started by LithiumOverdosE - Last post by optikon
can you drive your model and your bench setup with a sinewave? See how those compare. Could be the models frequency behavior was derived that way (?)
How much are the sim measurements off vs the bench?

I agree that if it takes less time to build it on the bench, then the sim is useless.

However, usually up front work is required for the models and then in the future you can spend less time with them --having being validated.

Also you have  a setup to measure B-H curve on the bench? Must be nice! :-)



 78 
 on: July 18, 2020, 12:06:51 12:06 
Started by LithiumOverdosE - Last post by LithiumOverdosE
Microcap does provide an example circuit called "core" - see my screen shot.

As I understand it, it uses the Jiles Atherton core model. The help topic for it does discuss it a little bit. It is a non linear model.


I'm aware of the examples and of the discussion in the manual and it all seems fine but the divergence from the real-life hardware is what makes me cautious to rely on the sims.


Quote
Now, I am not sure if that vendor 3C94 model core you are using is correct- but in theory, it should be able to be modelled correctly.

The manufacturer is Ferroxcube and over the years I've found their datasheets to correspond well with the real-life parts.


Quote
The Model program inside MIcrocap lets you build a non linear core model using some data sheet values / curves... so you might want to try that approach also.

I've tried Micro-Cap's core modelling utility a few years back but found it too cumbersome to work with based on the datasheets of some older cores.
The disadvantage of that approach, at least in my case, is that it takes much more time to make a new model based on datasheet and fit the parameters to correspond with the measured values of the physical part, rather than using the Micro-Cap available core models.
The way I see it, if making the sim behave correctly is taking more time and effort than testing the physical parts on the bench, then its advantages are void. 


Quote
Inside the model are a few things I am unfamiliar with like domain wall pinning constant. who knows if thats set right for the vendor model.. how to even figure it out.

Indeed, that's what's perplexing me as well.
I haven't found the source material that Micro-Cap programmers used as basis for their core models and I haven't find such parameters in the manufacturer's datasheets.
However, they must have based it on something because I suspect they haven't done their own modelling for so many different materials. 

 79 
 on: July 18, 2020, 09:02:46 09:02 
Started by ajith - Last post by Wizpic
I've also used the Max7219 and the TM1367 to build a new volt and amp meter for my power supply, The only trouble with the MAX7219 I could only get the .31" displays modules off E-bay which is cheaper than buying the chip it's self. I could get the TM1367 modules with .56" display. I used the MAX7219 to build my DRO for my digital calipers as  it was a new design. I did try the MAX7219 modules in my PSU but it did not look right.

 80 
 on: July 18, 2020, 08:10:24 08:10 
Started by ajith - Last post by GeneralMadDog
I also use MAX7219 / 7221. Good availability and cheap, ready to use displays available. But where can you get the parts so cheap?  Shocked

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