Any book recommendations regarding 1980s bipolar switch-mode power supply design?

@phos @RueNahcMohr I've looked at this test PCB several times over the years and only now do I realize that vertically centered tap-off points aren't enough, C-Y is inferior when compared to C-X and D.

What gets you with reverse geometry resistors is they may have a trim pattern that shifts the current towards one diagonal (Susumu RKL series?)

Best ones in terms of wideband performance, low-ESL I've had were RL series (array that can be replicated with a number of 0805 shunts as well).

Seems like Rack Robotics finally released a statement and did a Q and A on what’s been going on lately…

All team members except one jumped ship, but he’s promising to turn things around.

Most open communication I’ve had from them in probably ever, just not sure if any of these promises will actually be kept

@RueNahcMohr https://www.analog.com/en/resources/analog-dialogue/articles/optimize-high-current-sensing-accuracy.html I guess central is actually best

@RueNahcMohr I’d say same side and with more gap so there is no chance of solder bridging?

Also feel free to, it is one of the best EDM implementations I’ve seen and basically is a circuit I wanted to design myself before I came across it.

It is however schematic only, I guess as a way to stop people blindly replicating it thinking it’s a finished design and not just a prototype? I disagree with that tho, and also the creator hasn’t worked on it in a while

@jenesuispersonne milliohm not megaohm, so no high voltages there. Spec wise the highest sense voltage will be 30mV

@RueNahcMohr I was wondering so as well. I’m sort of recreating someone else’s project, schematic and BOM only, so I was a bit blindsided by this part.
it doesn’t seem like this is a thing they did, but I may try (R1) https://github.com/OpenEDM/.github/blob/main/images/arc_generator_v1.2.png

Like there is definitely a differential pair going to the resistor but I do not see the pad being split. It could be hidden under the part tho?

@RueNahcMohr https://www.lcsc.com/product-detail/C2903470.html

1%, you wouldn't want to introduce any error into your measurement (:

Why would you make a 1mOhm current sense shunt without kelvin connections?

@ChuckMcManis @RueNahcMohr some fluxes do come in a lightproof syringe which supposedly helps with longer shelf life, not sure what uv actually does to it, and I guess just keeping it in it’s packaging does about the same

there is something nice about the imperfection. you can always spend more time getting things just a little neater, moving around bits, yet it will never be perfect, taking away the need to reach that goal

Using KiCad makes me weirdly happy. There is something zen like about making sure things look nice

@jamesoff seemed pretty ok to open, take out the screws, slip in a spudger around the seam to undo the clips and it pops right open

@MLE_online it looks really nice, quite clean lines!

IP/Port: 99.251.254.190:5900
Hostname: pool-99-251-254-190.cpe.net.cable.rogers.com
Client Name: chipi chipi chapa chapa
Location: Willowdale, Ontario, CA 🇨🇦
ASN: AS812 Rogers Communications Canada Inc.
VNC Password: N/A
ID: 1794828
Added to DB: 05/06/2025, 10:54:13 PM (UTC)
Last seen: 05/06/2025, 06:52:41 PM (UTC)
https://computernewb.com/vncresolver/browse#id/1794828

hehehe

@RueNahcMohr I approve

It’s fan works with logic level (3.3v) pulse frequency control, almost like it was made to be controlled

Hacking one of them IKEA air purifiers

I love helping with your electronics projects as much as I can, but please make sure your schematics are actually readable if you send me or anyone else a project you need help on.

- use net labels / symbols for gnd, vcc, signals going from across the sheet
- use normal symbols for components.
- for stuff like ICs, having a note what it is helps.
- try to group stuff by functional blocks