// #eevblog — 2026-01-16
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02:29:52 Quit: steve30 ([email protected]) Quit: <Baljem> steve30: by the way, I had the most bizarre dream the other day that someone came in here and seriously flipped their shit over your quit message and why aren't the ops /doing/ something about it
02:30:37 Join: Kuschelpony ([email protected]) to #EEVblog
02:32:20 <arch> some of you nerds might find this linear ham radio psu interesting. it has a whopping 32000uF 40V rated metal can capacitor made by GE: https://imgur.com/a/eRM8YTB
02:32:58 <arch> lol i just noticed the tolerance on it: -10%, +75%. so it could possibly have a lot more capacitance
02:35:58 Quit: Kuschelpony ([email protected]) Quit: Ex-Chat
02:36:13 <arch> it's using the UA723 (LM723) linear reg controller IC https://www.ti.com/lit/ds/symlink/lm723.pdf ; there's a way to use those in a way as a crude buck controller
02:36:52 Join: Kuschelpony ([email protected]) to #EEVblog
02:38:07 <arch> https://www.reddit.com/r/AskElectronics/comments/taluh9/dad_gave_me_this_mega_old_power_supply_1214v_25a/
02:40:13 <arch> https://www.repeater-builder.com/vhfe/ps25m/converting-ne550-lm723.html looks like adding an overvoltage crowbar is a good insurance
02:40:14 <EEVBot> [url] Converting a VHF Engineering Linear Power Supply from Using an NE550 to an LM723 Regulator IC | www.repeater-builder.com
02:40:41 Join: xstevia ([email protected]) to #EEVblog
03:06:00 <arch> pretty cool. apparently these came as kits for people to assemble: https://www.repeater-builder.com/vhfe/pdfs/vhfe-ps-25c-cleaner.pdf
03:26:31 <MrMobodies> "25 amps intermittent (50 percents duty cycle)" Is that some kind of time limited peek when it goes below 50% for a while?
05:28:54 <Kuschelpony> T3sl4, mayi comment a bit about the UC343 ?
05:29:04 <T3sl4> what up
05:29:05 <Kuschelpony> UC3843
05:29:47 <T3sl4> arch: i wonder if those are hometaxials, the original RCA process
05:30:26 <Kuschelpony> as in reading the answer on stackexchange, there is in the datasheet right on page 7 the specification of the error amplifier output, with the source current maximum 0,8mA
05:32:10 <Kuschelpony> so connecting an optocoupler phototransistor there is right
05:33:10 <Kuschelpony> also page 12 "The error amplifier is internally
05:33:10 <Kuschelpony> current-limited, so that one can command zero duty cycle by externally forcing COMP to GROUND."
05:33:58 <Kuschelpony> oh page 14 iseven more explicit
05:34:18 <T3sl4> typ, not max :)
05:35:05 <T3sl4> also they're doing the thing where they say "min" but they give the largest (least negative) value, because they're idiots
05:35:53 <Kuschelpony> :)
05:36:00 <T3sl4> i mean it already says "sink current" or "source" so no sign is needed and a sign there is REALLY FUCKING PECULIAR
05:36:03 <T3sl4> but i repeat myself
05:37:04 <T3sl4> i'm sure the process variation is something like 1.2mA worst case, maybe even 2mA, but it's funny that they've described this use-case for so many decades, and never once specified the limit
05:37:23 <T3sl4> i'm not going to miss an opportunity to rag on application notes tho
05:41:33 Quit: Kuschelpony ([email protected]) Connection closed
05:42:06 Join: Kuschelpony ([email protected]) to #EEVblog
05:42:38 <xstevia> Hi
05:44:28 <T3sl4> meow
05:44:59 <Kuschelpony> sooo, nowthe power plug should sit well again
05:45:05 <Kuschelpony> also hello steve
06:40:45 Quit: Kuschelpony ([email protected]) Connection closed
07:28:41 Quit: xstevia ([email protected]) Ping timeout: 2 minutes
07:35:03 Join: steve30 ([email protected]) to #EEVblog
08:52:49 Quit: steve30 ([email protected]) Ping timeout: 2 minutes
09:39:17 Join: cheeseandchives ([email protected]) to #EEVblog
11:31:13 <arch> electrohead, check out the ez-pd as well. it also has i2c, but it's optional. the STUSB4500 appears to _require_ i2c programming, at least once: https://www.infineon.com/assets/row/public/documents/24/49/infineon-ez-pd-bcr-datasheet-usb-type-c-port-controller-for-power-sinks-datasheet-en.pdf?fileId=8ac78c8c7d0d8da4017d0ee7ce9d70ad
11:37:37 * electrohead squeezes Ampera
11:51:13 <MrMobodies> Hello
11:51:42 <MrMobodies> I brought two glass filters, one arrived but wanted the lid from the other. According to feedback they are the same dimensions
11:52:02 <MrMobodies> I was going to buy the Brita one first. They hadn't many any since 2010.
11:52:06 <MrMobodies> to discover this
11:52:18 <MrMobodies> https://i.postimg.cc/vQCD6crY/Brita-Cavity-Moid.jpg
11:52:18 <EEVBot> [url] Brita Cavity Moid — Postimages | i.postimg.cc
11:52:43 <MrMobodies> other other one came, not pleased with the lid but does function
11:53:00 <MrMobodies> then the other turned up today and was shocked
11:53:41 <MrMobodies> https://www.amazon.co.uk/dp/B0B31KX4R7
11:53:42 <EEVBot> [url] Amazon.co.uk | www.amazon.co.uk
11:54:04 <MrMobodies> See that in the listing?
11:54:05 <MrMobodies> https://i.postimg.cc/1tPQrh5P/Listing-2.jpg
11:54:05 <EEVBot> [url] Listing 2 — Postimages | i.postimg.cc
11:55:14 <MrMobodies> This turned up instead where they changed the design and now it's going back for return
11:55:16 <MrMobodies> https://i.postimg.cc/x8pVQXGf/Stupid-Cover-With-Holes2.jpg
11:55:17 <EEVBot> [url] Stupid Cover With Holes2 — Postimages | i.postimg.cc
11:55:29 <MrMobodies> https://i.postimg.cc/283fwxmj/Mould-Attracting-Rubber.jpg
11:55:29 <EEVBot> [url] Mould Attracting Rubber — Postimages | i.postimg.cc
11:57:26 <MrMobodies> Wouldn't you be angry if you were mis sold something so different to what was shown and have to go to the effort of repackaging and sending it back?
12:11:54 <MrMobodies> https://i.postimg.cc/9C2b7f1h/Missold-waterfilter.jpg
12:11:54 <EEVBot> [url] Missold waterfilter — Postimages | i.postimg.cc
12:12:04 <MrMobodies> What do you think of the old and new design?
12:12:16 <MrMobodies> of that lid
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17:32:00 Topic Is: Official IRC channel of the EEVblog - www.eevblog.tv
17:32:00 Set By: (ChanOP) on: Mon Sep 22 21:57:42 2025
18:20:53 Join: steve30 ([email protected]) to #EEVblog
18:20:54 Mode: (by ChanOP) +o steve30
18:29:12 Join: watcher ([email protected]) to #EEVblog
18:31:29 Quit: watcher ([email protected]) Client exited
18:42:07 Quit: cheeseandchives ([email protected]) The TLS connection was non-properly terminated.
19:20:41 <watcher> Nice K
19:22:50 * watcher hugs K
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