Recent Posts

1

General Technical Chat / Re: NEOM linear WEF/Technocracy city , latest crap building project the sect doing.

« Last post by MT on Today at 12:25:47 am »

As predicted by many of engineers and economists a massive pullback on the entire project by Saudi gov. https://thecradle.co/articles-id/24316
“The pullback on The Line comes as the kingdom’s sovereign wealth fund has yet to approve Neom’s budget for 2024,” Bloomberg writes, citing unnamed sources familiar with the matter.
“It shows that the financial realities of the trillions of dollars of investment are starting to cause concern at the highest levels of the Saudi government

2

Microcontrollers / STM32H7 ADC characteristics

« Last post by hk.ketabdar@gmail.com on Today at 12:23:39 am »

Hi,

I'm working on a setup with a filter and some electronics to get an analog signal ready for a ST microcontroller (STM32H723VG). I want to simulate everything, even the part inside the microcontroller that handles the signal. But the problem is, I can't find the info I need in the microcontroller's manual. The manual does have a table that shows how long it takes to sample different signals, depending on how much resistance the source has. But I'm not sure how to use this info to figure out the resistance and capacitance inside the microcontroller.
So far, I've tried to guess the resistance and capacitance by looking at the sampling times in the table. I came up with a guess of 1K ohm for the resistance and 8.5 pF for the capacitance. But I'm not sure if 1 kilo-ohm is right. I want to sample at about 4MSPS, but 1 kilo-ohm might be too much resistance to do that quickly enough within 0.5LSB and with the required sampling time of 60-70 nanoseconds.

Here are some details about the setup:

Microcontroller: STM32H723VG
ADC input range: 0-3.3V
Signal Bandwidth: 1MHz (-3db)
Filter attenuation at 4MHz: -40db
ADC Resolution: 12 bits
ADC channel type: Fast Channel
ADC Clock: 40MHz
Sampling time (2.5): 62ns
Sampling frequency in dual mode: 8MSPS (two ADC at 4MSPS)

Note: The images show the last stage for level shifting, charge bucket and ADC internal

Any help or advice would be great.

Thanks!

3

Power/Renewable Energy/EV's / Re: Such a horrible design from Lenovo

« Last post by wraper on Today at 12:20:51 am »

Similar size to NPIM74P1R0MTRF 11A Irms, 22A Isat

4

FPGA / Re: VUnit, UVVM, OSVVM: What are similarities and differences?

« Last post by matrixofdynamism on Today at 12:15:47 am »

If Python is adept at hardware design and verification, I am interested to know why it has not taken over the industry yet. I am not at all well informed on the subject.

By co-simulation you mean processor running software connected to peripherals that are HDL designed via some sort of standard bus like AMBA AXI?

Jim Lewis of OSVVM (also leading VHDL language development) has done something for cosimulation and here is article. But, I am not sure if this is actually any good since it is quite new.
https://osvvm.org/archives/2159

I am actually kind of fed up with the hardware domain lagging SOOOOOOO much behind the hardware domain. VHDL-2019 was released a few years ago but most tools still do not even support all of VHDL-2008. Then there is this divide between VHDL and SystemVerilog. Then we have SytemVerilog UVM which the VHDL world is trying to catch up with by developing UVVM, OSVVM, VUnit. We have different vendors like Intel, Xilinx, Microsemi, LatticeSemiconductor and who knows what else that might have decent silicone but the software tools are just terrible or almost unuseable sometimes. I mean, why not all work together and make a lot of open source tools as well? All we need is decent simulators with decent wave viewers and BFMs for complex things like full AXI4. Is that really asking for a lot? But that is a different topic altogether.

5

Manufacturing & Assembly / Re: Metcal MX-5210 underwhelming performance

« Last post by narkeleptk on Today at 12:12:14 am »

Did you try contacting Metcal at any point to see if they would be able to get you a quick replacement? Most likely a dead end, given their inability to respond to customers, but, might have been worth a shot.

I have had great support from Metcal. The cable on my desoldering gun went faulty after very light use. Even though it was older then a year, they still sent me a free replacement for it. Its definently worth reaching out to them.

6

Manufacturing & Assembly / Re: Metcal MX-5210 underwhelming performance

« Last post by narkeleptk on Today at 12:08:58 am »

Must be the tips your using.
I have a cv5210 and work on automotive stuff so usually the pcb's still attached to the aluminum case. The standard handpiece with a 8CH0050s tip gets it done everytime for me.
I cant even imagine what it would do with the heavy duty handpiece & tips.

7

Power/Renewable Energy/EV's / Re: Such a horrible design from Lenovo

« Last post by wraper on Yesterday at 11:57:43 pm »

Nice job!

your 5mm is 400px
and 8mm is 508px

also, nice math

You don't consider inductor has rounded corners when counting the pixels. However yes it's not right and closer to 7mm, not 8.

8

Repair / Re: repair of soldering iron 8878D rework station (exploded ground trace)

« Last post by dial-a-monkey on Yesterday at 11:54:48 pm »

Exact same thing happened to me.. also the rectifier diodes blew up at some point - but it is for electronic repair

Does anyone know the specifications for the soldering ceramic element and hot air element?

I need to order replacements from Europe but don't have time to wait to get the part from China..

Is the soldering iron ceramic element is  1321? 1322? or or 1324?  ( i emailed the manufacturer Yagong but no reply)

it'a definitely 24 VAC measured with the power on, the length seems ~ 60 mm (but mine is broken)  x 3.8 mm diameter - I don't know the watts i thnk i read the specs as 60 watts but the 1321 ( most likely fit ) is 63 mm

9

General Technical Chat / Re: Where'd Mornsun go?

« Last post by switchabl on Yesterday at 11:50:28 pm »

ISTR seeing a Mornsun PSU in a Bambu Lab A1 printer in a vid recently..

Hard to see how any restrictions on parts being used within other products would be practical - where do you stop - the PSU, the components inside the PSU...

Though if you did happen to be importing a product with a Mornsun PSU, maybe it would be prudent to slap your own internal part number stickers over the original manufacturer's labels...

My understanding is that these kind of sanctions target organisations/individuals and not products specifically. This would include freezing their assets (potentially including items stocked at distributers) and prohibiting US-based individuals and companies from doing business with them. Importing goods containing their products into the US may or may not be illegal depending on the specific circumstances.

10

General Technical Chat / Re: Boeing 737 Max again, it would be nice if the windows stayed in!

« Last post by MT on Yesterday at 11:50:17 pm »

Whistle blowers often die after blowing the whistle, its very strange, scientists and fact checkers says.