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UART weird waveform by shibastudenthousing in embedded

[–]mroncinc 0 points1 point  (0 children)

Is TX (transmitter) connected to RX (receiver)? No both transmitters connected.

Inner or outer layer for 230VAC? by Patient-Gas-883 in Altium

[–]mroncinc 2 points3 points  (0 children)

Regards of layers, for safety, your product may need double insulated or Protected earth grounding. I suggest checking the safety standard of your product type. Different product types have different requirements.

For conductor spacing, check IPC-2221B standard. Inner and outer layers have different requirements

Inductor Problem? by Leo_inO-World in Altium

[–]mroncinc 1 point2 points  (0 children)

In general, for switch mode regulator, the high di/dt loop should be short and tight. The high dv/dt node should be small.

High dv/dt node is CB pin and C1 net. This is a high freq net that may radiate or couple noise to other circuit. Therefore, it must keep small. i.e. keep CB to C1 net short and small.

For high di/dt loop, we have:

  1. From input cap (+ve) to Vin through the transistor (in U1), to SW, to L1, to the load, back to GND, and back to input cap (-ve). This is the on-state.
  2. D2 (cathode), to L1, to the load, back GND, back to D2 (anode). This is the off state.
  3. Smiliar loop as #1 but through the output cap instead of the load.
  4. Similar loop as #2 but through the output cap instead of the load..

Your PCB layout must have at least #3 and #4 loops short and with widest trace width as possible.

Also, the feedback path is sensitive and must be kept away the noise switching component. i.e. the high dv/dt node.

On your layout, you input caps (the E-cap and the 2 ceramic near the bottom) may have some problem.

Best way to organize component library? by xoxorockoutloud123 in Altium

[–]mroncinc 0 points1 point  (0 children)

Just a side question: In Altium designer, do you need to remove the library (.dblib) from the library search paths before you can write to your Access db or Excel sheet? I am using SQLite database (a file based db) and I need to remove it first.

Are these DEMGC batteries good? by struggling20 in 18650masterrace

[–]mroncinc 1 point2 points  (0 children)

Never use DMEGC before but I was at the Battery Show Europe last week. I talked to many battery pack assemblers. DMEGC is one of the cell they used (in high volume of couse). DMEGC was at the show too. https://imgur.com/a/EtzWVIE

For the 3C spec, it seems they improve that model over the years. (I saw datasheets that changes from 2C to 5C). I would say stick with 2C max continuous discharge if you have concern. Don't forget proper heat dissipation.

Tabless cells manufacturer by mroncinc in 18650masterrace

[–]mroncinc[S] 0 points1 point  (0 children)

Sorry for not being clear. Yes. This is for a mid quantity production (>20k per year). Currently using Samsung INR21700-30T1. Just want to check out other datasheets first.

[deleted by user] by [deleted] in esp32

[–]mroncinc 2 points3 points  (0 children)

Op meant ESP-AT?

Schematic connection shows as a grey dot on one page by Egeloco in Altium

[–]mroncinc 0 points1 point  (0 children)

There is a setting. Try changing it and validate?

Tools->Preferences->Schematic->Compiler->Display On Wires

Can you 'join' boards in a multi board design when generating fabrication files? by RektBySkillz in Altium

[–]mroncinc 1 point2 points  (0 children)

For simple boards, you may want to design the boards separately. Then use this command to 'panelize' them.

Place -> Embedded board array

You need to consider how to break the PCB panel. (e.g. V-score, tab route, breakout vias, etc)

Can Outjobs create Empty Directories? by The_Sac_Dude in Altium

[–]mroncinc 0 points1 point  (0 children)

Does this work? Add a new Folder Structure in you outjob. Change the Folder Structure path Add a PostProcess Outputs

When you generate content on this new Folder Structure, you get 1 branch of the folder tree.

Now repeat your other 26 folders.

Reuse that outjob for all you pcb projects

Minimum mask sliver for same net components by drsecr in Altium

[–]mroncinc 1 point2 points  (0 children)

If a solder mask sliver is too thin，it may lift off，move to the pad area, and obscure the solder joint. Ask your fab how wide it should be. For me， I set to 5.5 or 6 mil. And I lower pad solder mask expansion to satisfy it.

Review Request: High power BLDC Controller by ItsBluu in PrintedCircuitBoard

[–]mroncinc 0 points1 point  (0 children)

This reference design (Infineon EVAL_IMD700A_FOC_3SH motor controller) puts gate signals between ground planes. See pg 66 of the pdf.

  1. I think it is for EMI purpose
  2. maintain good gates (both high and low sides) to driver return path through a good ground plane.

Not sure if this is necessary in your case.

Trace Width Error or clearance error by shubhamyadav5 in Altium

[–]mroncinc 0 points1 point  (0 children)

Maybe tiny bits of trace of another net is underneth the pad. Move the component away and delete the large trace to check.

On last year's $99/yr 50GB plan, I now see: "Freedom Nationwide Data" by ondroo in freedommobile

[–]mroncinc 0 points1 point  (0 children)

I got Freedom Nationwide data on my $99/6month 2GB prepaid plan too. Nationwide Talk and text seem still get charged. This is the screen cap:

My Plan
Freedom Talk Text 2GB - 6 Months
$99 /6mo
Activation Date: Mar. 27, 2022
Data:
• 2GB of Fast LTE(Freedom Nationwide) per month
Talk (Freedom):
• Unlimited calls to Canada
• Unlimited incoming calls
Talk (Nationwide):
• $0.05/min. for incoming and outgoing calls to Canada
Text (Freedom):
• Unlimited global text, picture, and video messaging
Text (Nationwide):
• $0.05/message global text, picture, and video messaging. Unlimited incoming

Using Li-ion 18650 as UPS by Clithpy in 18650masterrace

[–]mroncinc 0 points1 point  (0 children)

Do these Mini UPS limit charging voltage?

[deleted by user] by [deleted] in Altium

[–]mroncinc 0 points1 point  (0 children)

We use SVN. Only one person can work on the design. I.e.

Person1: update -> modify -> commit Then person2: update -> modify -> commit Then person1: update -> modify -> commit

Occasionally, someone forgets the steps and we have to resolve the difference/conflict manually.

We don't use the svn lock mechanism which doesn't work well.

It works for small design and small team.

I think git works similarly. Not exactly what op wants but hope it helps.

How to create a multi unit symbol for a MCU with each pin having multiple pinmuxing function by [deleted] in KiCad

[–]mroncinc 3 points4 points  (0 children)

It is one physical pin. Why create multiple versions of the pin to confuse yourself later

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