I just finished my first attempt at a design for a schematic symbol in Kicad for an MCU (STM32N657Z0H3QTR).

https://estore.st.com/en/stm32n657z0h3qtr-cpn.html

Schematic: "2022 - We've updated the circuit design to use widely-available part AB1234DL rather than the impossible-to-find one the original design used!"

<search Newark/RS/Element14>

Website 2025: "AB1234DL: obsolete, not available to order"

Sigh.

It's amazing how I can paste a #schematic into #ChatGPT and have it interpret it. But it's also amazing the nature of the mistakes it sometimes makes.

TFW your schematic capture program can export 5 different flavours of netlist, and your PCB design software can import 7, and there is no overlap between them...

Since I've never needed to build any low frequency active filters, I'm going to spin a proto board to see how they work. Set up for a dual op-amp footprint, and a Sallen Key on one side, and a multiple feedback on the other.
#electronic #opamp #filter #Schematic #PCB

A little schematic update from the 1970s(?) found recently.  #Armon AR-27 tone generator board.

https://zasm.earth/armon-ar27-schematic

#Leonovo #ideapad 520s does not charge and does not run from power supply, but runs from power supply with unplugged battery?

In my case, the broken part was PQ305, AON7408L in DFN8-5 package, on the PCB side that faces the keyboard.

The metal foil is best removed from the inside with a toothpick through those two holes.

I used hot air to replace the part.

Part cost shipped: 10€ (10 pcs - anyone need 9?)
Diagnosis time: ~1 hour
Replacement time: ~30min

#repair #diy #ElectronicsRepair #ifixit

Edit: I was only able to repair this by using #leaked #schematic and #layout data. This should be available legally! #righttorepair

How to Draw a Skull

Venice’s Vaporetto Schematic Route Map
--
https://www.venice.nu/wp-content/uploads/2023/04/mappa_linee_di_navigazione-_aprile_2023_web.pdf <-- link to schematic map
--
https://youtu.be/VrksgMi9t4M?si=jO9GULt0_IQdA0aj <-- overview video of the vaporetto system in Venice
--
The vaporetto (water bus) in Venice, Italy has a schematic map like a subway map.
Indeed, there are strong similarities in colours / fonts / icons to the iconic New York City subway map(s)…
It would be an amazing job, seeing that city from the water every day, and yes, I am romanticizing it of course!
(I had the pleasure of spending most of a Sunday every week in Venice for an Italian winter, as we transferred clients to and from the Dolomites, such an amazing, rich city!)
#GIS #spatial #mapping #mapnerd #transportation #publictransportation #vaporetto #waterbus #bus #venice #venezia #italy #schematic #subwaymap #city #urban #urbantransportation #routemap

The "Ground": that thing is very important in your electronic schematics! Don't underestimate it and don't forget it!

Ugh, an intensive day with too much sitting, fully immersed in circuit work.

The ramp up with #KiCad tools was very smooth. I didn't find any roadblocks in #schematic capture, part coding, #PCB layout, nor cleaning up DRCs. The tools have come a long way since my last use in 2021! Pleased!

A scan through manufacturability tomorrow and the full cycle is complete. Yay #FOSS.

A new release of the schemdraw package for Python adds functions for drawing "pictorial schematics", where the circuit elements are drawn as realistic icons, set up via code! Some basic pictorial circuit elements are included (resistors, LEDs, capacitors, breadboard, etc.), but it can also import and draw part files in the Fritzing format as shown here.

Happy circuit drawing!

I needed an audio probe kind of thing to test other stuff with, so I built this. Nothing really new here, it's essentially just a tweaked datasheet example using common basic concepts, and variations of this circuit can be found all over the place. I figured I'd post this anyway, in case someone else might find it useful.

A page with some notes and stuff can be found here:

https://www.fstateaudio.com/?page_id=1643

New #blog post: HowTo: A very simple three step water level indicator for Arduino / ESP

https://deltalima.org/blog/index.php/2024/03/31/howto-a-very-simple-three-step-water-level-indicator-for-arduino-esp/

Okay, why do I always find #schematic errors after I've handed over the whole thing to #layout?

I mean, it's not like I don't know that there always will be a push to have the layout started two weeks ago, but somehow it always gets me: schematic done, review, approval, new information coming in: "change this", layout team lined up and project manager impatient, make the change "this should be the last", no time for review (layout after all already in progress), finding flaw in the fix.