// #eevblog — 2026-03-10
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00:16:50 <motosteve> No shortage of nitrous oxide canisters around today
00:28:31 * motosteve goes cruising up the canal
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03:10:22 Quit: motosteve ([email protected]) Quit: Goodbye Moto
03:43:07 <Ysjoelfir> steve30, why do you expect NOX canister shortages? is that rare in the Kingdom of U nowadays?
03:44:05 <electrohead> !caffeine Ysjoelfir
03:44:05 * EEVBot turns Ysjoelfir into a rockstar
03:44:08 <electrohead> \m/
03:44:20 <Ysjoelfir> woah!
03:44:24 * Ysjoelfir rocks the stars
03:44:33 * Ysjoelfir cooks at the same time, more or less
03:44:56 <Ysjoelfir> well, tbh, I'm sitting on my ass, drinking a monster, procrastinating, because I hate touching flour and todays feast involves that
03:46:25 <steve30> no shortage at all
03:46:33 <steve30> they're scattered around all over the place
03:46:40 <Ysjoelfir> ok? why is that?
03:49:22 <steve30> people buy them to inhale it, then discard the cannisters
03:50:47 <electrohead> ahh, "whip-its"
03:51:08 <electrohead> I remember growing up as a kid, my dad had a friend that would come around randomly, he went by "whip-it"
03:51:23 <electrohead> was never told why, eventually figured out years later in life ..
03:51:25 <electrohead> heh
03:52:57 <Ysjoelfir> why.... would you inhale nox? o.o that doesn't sound particularely healthy
03:53:16 <electrohead> to get high
03:53:21 <steve30> Why? Because.
03:53:30 <electrohead> because people are fucking stupid, that's why
03:54:10 <electrohead> (not everyone, hopefully that's implied)
04:02:46 <Ysjoelfir> people are strange
04:24:38 * steve30 attempts to make a vertical video
04:26:04 <MrMobodies> They are talking about protecting "women" i crowds
04:26:09 <rc-garage> why not try a diagonal video? vertical has been done enough
04:26:18 <MrMobodies> https://www.bbc.co.uk/news/articles/c0jvy4xn0l4o
04:26:18 <EEVBot> [url] Cumbria firm develops predator-spotting tech to keep women safe - BBC News | www.bbc.co.uk
04:26:44 <MrMobodies> Won't protect them when it's quite
04:26:56 <MrMobodies> Why not just issue them with tazers
04:30:40 * steve30 needs a coffee
04:59:36 * steve30 passes the channel some canal... and some whip
04:59:37 <steve30> https://www.youtube.com/shorts/ay7kD9sAqLA
04:59:37 <EEVBot> [YouTube] Sheffield Canal Towpath Closed (almost) | 1m 52s | Channel: steve30 | 0 views | 2026-03-09 - 17:56:35 UTC
05:01:46 <arch> Kuschelpony, T3sl4 you remember that 3kva transformer i got? so i found that sometimes, it will trip the 20A breaker. guess it depends on if the voltage waveform is at zero voltage crossing, it probably temporarily saturates the core and causes high inrush current. i do have enough space in the trafo enclosure to put an NTC+relay PCB in there.
05:01:58 <T3sl4> toroid?
05:02:19 <Kuschelpony> im suprrised that it only occassionaly trips the breaker
05:02:27 <arch> i dont believe so. it's a dry type encapsulated trafo, this one: https://www.radwell.com/Buy/HUBBELL/ACME%20ELECTRIC/T-3-53043-S
05:02:27 <EEVBot> [url] Just a moment... | www.radwell.com
05:03:12 <Kuschelpony> and yes, switchign on zero crossing is the moment where you get the most magnetic saturation possible
05:03:12 <arch> like i said, most of the times it wont. that could just be me getting lucky and switching it on at or near either peaks of the waveform
05:04:02 <arch> in any case, i am happy because i tested it out by loading it with ~1400W resistive load. the output voltage drops only about 3V
05:04:14 <Kuschelpony> im not sure if a NTC is best, i would rather use just a fixed resistor AND a thermal fuse tightly coupled to it
05:04:51 <arch> i have seen the NTC+relay method a lot in older passive PFC dell ATX psus > 1000W
05:06:13 <arch> hmmm...actually now that i think about it... i wonder if there are ICs that detect when the peak of the AC waveform is coming up, and switches a relay at that point... that might be an option to eliminate the NTC altogether
05:06:44 <arch> obviously relay might have a few ms delay, but whatever
05:09:08 <arch> oh, another thing i want to show off today. here is my single layer copperclad layout of my 12V and 5V synch buck sections. the blue traces are overhead 32awg enamel wire. https://imgur.com/a/79g5edD
05:10:04 <arch> haven't thought about what to do about the USB-C power. im thinking using 12AWG insulated scrap romex i have. put them to use since they are out of code for new wiring. 1980s romex.
05:10:25 <arch> gonna use 12awg romex for all the power rails routed overhead
05:10:55 <Kuschelpony> a relayis much to slow to accurately time this
05:11:03 <Ysjoelfir> my go-to method for inrush current fighting of fat trannies was always a big, kinda slow 230VAC relais + a 10 ohms series resistor that gets bridged by the relais. the delay of the relay contacts closing has (so far) always been enough to cut down the inrush peak to a value that is manageable for the fuse
05:11:49 <Kuschelpony> it only needs one positive and one negative period of delay
05:13:12 <Kuschelpony> there is a german invention called TSR which uses a phasecontrol circuit to apply first short pulses to intentionally drive the transformer to saturation of one polarity (but with harmless current spikes) and then switches on the next wave with opposite polarity
05:13:39 <Ysjoelfir> oh? I never heard of that, but that sounds pretty clever
05:13:40 <arch> gonna see what google ai has to say about peak detector ICs for this task
05:16:28 <Kuschelpony> arch, you better look for zero crossing plus an integrator doing -90° phase shift
05:16:48 <arch> ahh ok, so zero cross detector + 555 timer delay of a few ms, something like that
05:16:52 <Kuschelpony> this is btw: the exact thing that magnetizes the transformer core, the inetgration of the voltage
05:17:10 <Kuschelpony> no, RC integrator causing -90° and then a zero crossing detector
05:19:12 <Kuschelpony> there is even a german wikipedia article (but no english one) https://de.wikipedia.org/wiki/Transformatorschaltrelais
05:19:13 <EEVBot> Unexpected JSONDecodeError (Expecting value: line 1 column 1 (char 0)) from Kuschelpony. Message was: https://de.wikipedia.org/wiki/Transformatorschaltrelais
05:19:49 <Kuschelpony> https://de.wikipedia.org/wiki/Datei:TSR-Verf-U-B-H-I.png
05:19:49 <EEVBot> Unexpected JSONDecodeError (Expecting value: line 1 column 1 (char 0)) from Kuschelpony. Message was: https://de.wikipedia.org/wiki/Datei:TSR-Verf-U-B-H-I.png
05:20:02 <arch> https://fscdn.rohm.com/en/products/databook/datasheet/ic/power/isolated_converter/bm1z012fj-e.pdf
05:23:53 <arch> so if i understand right, that IC already has an option for built in delay Kuschelpony. rather than using rc integrator. so my guess how it would work: 1. have nonisolated buck reg, or zener dropped vcc from mains supply that ic; 2. adjust time delay of ic; 3. feed output to relay to switch on main inductive load
05:23:58 <Ysjoelfir> Thank you Kuschelpony, that was very interesting to read!
05:24:28 <arch> i am using firefox's translation built in to read that page now
05:26:19 <arch> oh also another good news: the onboard circuit breaker pretty much tripped simultaneously with the house circuit breaker, on those tests where the inrush tripped. good to know my onboard breakers work
05:26:59 <arch> i used spade connectors, so it will be trivial to stuff in another board like the TSR you mentioned Kuschelpony
05:28:15 <arch> "The inrush current is therefore particularly high in the case of low-loss transformers. Transformers with low idling currents and low iron losses also retain a particularly high remaniac induction after switching off, which in turn is partly responsible for the high inrush current. " that explains it. datasheet for that distribution transformer did mention it is "low loss"
05:29:35 <arch> $200! wtf https://www.ebay.com/itm/304485318409
05:29:36 <EEVBot> [url] FSM TSRL93100235 90..260v 32a Transformer Switching Relay | eBay | www.ebay.com
05:31:03 * K gives arch a fire extinguisher with instructions on it in Latvian
05:31:16 <arch> \o/
05:31:16 <EEVBot> |
05:31:16 <EEVBot> / {
06:22:02 <rust_collector> we need more instructions in livonian
06:26:52 <K> yes
06:37:11 <arch> no
06:48:20 <K> butt
06:51:15 <rust_collector> yes butt!
07:01:02 <K> more butt?
07:01:18 <rust_collector> all of it
07:17:08 <arch> rust_collector, you just might be an... https://www.assmann-wsw.com/
07:17:09 <EEVBot> [url] ASSMANN WSW components GmbH - A good connection | www.assmann-wsw.com
07:24:07 <rust_collector> https://www.youtube.com/shorts/eQPe0W3dh3M?feature=share
07:24:08 <EEVBot> [YouTube] Super flexible light ! #mobilemechanic #automotive | 13s | Channel: HilltonZ | 5,622 views | 2026-03-08 - 21:26:35 UTC
07:25:33 <arch> rust_collector, https://c.tenor.com/5q1eixWk68gAAAAd/tenor.gif
07:26:14 <rust_collector> yeah, wth did you think that was made for?
07:31:16 <arch> i thought it was for microwaving, like this: https://www.reddit.com/r/videos/comments/2ls1sd/glow_stick_blows_up_in_kids_face_one_of_the/
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14:15:03 <MrMobodies> Hello
14:16:01 <MrMobodies> Got the ISA motherboard today and the heatsink but idiot packager decided not to properly package the heatsink so all the mounting clips snapped.
14:16:19 <MrMobodies> I paid premium for that heatsink and delivery so I am not pleased.
14:17:40 <MrMobodies> Anyway I had clear the way to a cupboard stacked full of PC's to find a suitable socket 775 fan which I took out of some HP Pavillion Quad core but the backplate was easy to assemble.
14:17:43 <MrMobodies> https://i.postimg.cc/HYQF4kbm/ISA-Line-In-Line-Out-passthrough.jpg
14:18:50 <MrMobodies> it operates the ISA soundcard enough so I could adjust the volume and turn on and off the effect. When attempting to play, I hear faint white noise and this whistling but no sound as anticipated.
14:19:53 <MrMobodies> Used the onboard to play audio and connect it to the line in on that soundcard and out and no problems
14:20:53 <MrMobodies> Next step is to connect an Emu1820m with dock to it and wire it up in place of the P3 and see if there is any noise
14:21:45 <MrMobodies> I connected the headphone to that and the P3 and that very faint white noise on max volume seems consistent
14:23:26 <MrMobodies> It looks promising. If it works, I'll take the P3 out and put it back under my desk and put this duo core in it's place on the rack and one day leave it at the pub.
14:23:49 <MrMobodies> and just order the same mixers and tie wrap it to my racking where they use to be
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14:44:45 <AustGuest0282> Well hello
14:50:47 <Halcyon> Afternoon
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15:37:29 <MrMobodies> Well it looks promising, no added noise
15:40:42 <MrMobodies> https://i.postimg.cc/2kJZzCV9/Audio-passthrough.jpg
15:40:57 <MrMobodies> Just connected it up in the middle and it sounds promising
15:43:15 <MrMobodies> disappointing i can't play things through that ISA Aztech sound card due to lack of DMA but it works with the SRS3D effect, can control input volume and better than I can get it to play stuff and do a lot more things than just an underpowdered Pentium 3 just there to power on things.
15:43:55 <MrMobodies> I don't hear any noise when connecting the line in and line out through that ISA sound card so that's pleasing
15:45:10 <MrMobodies> got that board for about £63
15:45:11 <MrMobodies> https://www.ebay.co.uk/itm/336456233419
15:45:11 <EEVBot> [url] Commell P4ELA Intel Socket 775 E7500 CPU mATX Motherboard GPIO, rare ISA SLOT | eBay UK | www.ebay.co.uk
15:47:05 <MrMobodies> the larger boards with more slots seem to be sellong between £250 to under £400
15:47:59 <MrMobodies> and it was selling locally whereas those are overseas in China or Germany so I didn't have to wait
15:48:34 <MrMobodies> Electrohead you there?
15:50:18 <MrMobodies> I have a question about a 19cm PCI ribbon extender on ebay. There is a shared PCI slot near the ISA that I can't use when the ISA slot is populated.
15:51:39 <MrMobodies> Could that cause problems with the length? I want to put another sound card in it in a larger case underneath.
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22:21:38 <electrohead> Mentally? no
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