00:00 <whitequark> qu1j0t3: ##whitequark

00:00 <qu1j0t3> oh. i should be in there, i think.

00:00 <qu1j0t3> as a fan.

01:21 <cr1901_modern> SolraBizna: Enchancement-mode, N-MOSFET requires positive gate voltage, enhancement P-MOSFET requires negative. >>

01:21 <cr1901_modern> For depletion mode, the channel that allows electrons to flow _already exists_ at 0 gate voltage, so you need to apply a voltage in the opposite direction to remove the channel

01:22 <sorear> MOSFETs are confusing because they're actually four-terminal devices, but nobody tells you this during the first year

01:22 <sorear> and you have to figure out what substrate bias is

01:22 <cr1901_modern> Yea, but you almost never care about it

01:23 <cr1901_modern> thus to turn off a depletion mode N-type, apply a negative voltage. To turn off a depletion mode P-type, apply a positive voltage.

01:24 <cr1901_modern> N-type depletion mode has a cool property where if you tie gate and source together, and attach the drain to a voltage source, you get a pullup "resistor" without using a resistor (drain == source voltage also removes the channel)

01:26 <sorear> and then there's a different combination of ties that gives you a current regulator

01:36 <cr1901_modern> I've thought NMOS pullups typically operated in the linear (ohmic) region. Based on this I-V curve, it looks like they operate in cutoff (Vds = 0) and saturation (Vds = around 5), just like their enhancement mode counterparts (which are used as switches to implement digital logic functions)

01:36 <cr1901_modern> https://www.electronics-tutorials.ws/transistor/tran36.gif

01:37 <cr1901_modern> https://www.electronics-tutorials.ws/transistor/tran_6.html For the curious- I wanted to see IV curves

01:45 <Bob_Dole> what's the best PCB prototyping places? might need to consider pcb thickness for card-edge stuff at some point in the future

01:48 <Zorix> i heard good things about oshpark, jlcpcb, pcbway, pcbcart

01:48 <Zorix> im going to try jlcpcb due to cost

02:19 <TD-Linux> most card edge connectors use standard thickness pcbs

02:27 <Bob_Dole> some I was looking at were a different thickness from oshpark's standard, but seeed offered it

03:46 <Bob_Dole> SolraBizna, TD-Linux here is doing 68k things.

15:51 <tnt> A few days ago someone on twitter posted a one page summary of the risc-v opcode encoding ... and for the life of me, I can't find it again. Does anyone happen to have the link ?

15:51 <tnt> (I wish twitter had a "search your own timeline" ...)

15:52 <etrig> tnt: this one? https://docs.google.com/spreadsheets/d/12F7W2U2dY58HXZ6xLZiDkmP6BdFd5A9hhfnmRQ1pdOc/edit#gid=0

15:53 <tnt> etrig: YES, thank you !

15:53 <tnt> I spent the last 20 min trying to find it back after an unexpected reboot and loosing the tab :p

15:53 <etrig> from @babbageboole for reference

15:54 <etrig> committed to using the heart button only for bookmarks for the same reason :o)

15:55 <tnt> Arf, he used risc_v .... I used twitter search with risc-v and riscv and neither matched :p

15:59 <SolraBizna> I approve of this instruction encoding, and now have no excuse not to finally learn RISC-V assembly

17:01 <tnt> Damn, those zephyr applications are "huge" (well compared to available EBR on a UP5k) ...

17:01 <tnt> (they're actually larger than the available EBR ...)

20:30 <balrog> [11:51:21] <tnt>(I wish twitter had a "search your own timeline" ...)

20:30 <balrog> it does under advanced search

20:33 <tnt> balrog: really ? I see an option "From people I follow". But that's not my timeline ... doesn't include retweets from people I follow AFAICT.

20:33 <balrog> it's in advanced search

20:34 <balrog> "From these accounts", "To these accounts", "Mentioning these accounts"

20:34 <balrog> hmm but that might not include retweets

20:34 <tnt> Well ... I didn't know _who_ posted it ... just that it appeared in my timeline at some point :p

20:39 <pointfree> I just got a 1 lbs grab-bag of chips from ebay.

20:39 <pointfree> It's got some pla's in dip packages.

20:40 <pointfree> This is gonna be mad fun.

21:16 <gruetze> ooh, neat

23:42 <Bob_Dole> SolraBizna, <rqou> if anybody wants to figure out rust ppc musl, i will throw you a bounty

23:55 <futarisIRCcloud> https://jcat.eu/product/usb-isolator/ - Cripes, a 375 EUR USB 2.0 (High-Speed) FPGA based USB galvanic Isolator... I think I'll just grab a https://www.adafruit.com/product/2107 for low/full speed... Unless anyone has any better suggestions?