// #eevblog — 2025-10-25
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01:05:41 <arch> anyone know if the following would work? it's pretty stupid, and costly, and inefficient, but i was curious: https://i.imgur.com/iuDTFuk.png
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01:08:57 <arch> it's kinda like: https://www.reddit.com/r/funny/comments/2g9jf4/why_is_this_so_funny/
01:53:04 <arch> T3sl4, you there?
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02:31:37 <arch> where's everyone at, bingo?
02:36:57 <rust_collector2> sssh!
02:38:53 <arch> https://www.youtube.com/watch?v=apWYo8Z-t8U
02:38:53 <EEVBot> [YouTube] Resident Evil 4 - Bingo | 44s | Channel: Nathi 96 | 269,232 views | 2017-08-09 - 22:20:18 UTC
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05:07:03 Nick: rust_collector2 is now known as rust_collector
06:29:25 <arch> Kuschelpony!
06:29:38 <arch> am i glad to see you
06:29:40 <Kuschelpony> yes, arch?
06:30:02 <arch> i had an EE question, more a thought experiment, that i hope you dont mind me asking
06:30:21 <Kuschelpony> its perfectly ok to ask me
06:30:41 <arch> i was wondering if i rearranged this synchronous buck circuit, which requires 4.5V minimum for startup, to output -5V in inverting buck boost config
06:30:51 <arch> but the trick being, it needs to run of a 1.5V AA battery
06:31:06 <arch> here is the schematic i came up with. does this seem like it would work?
06:31:14 <arch> https://i.imgur.com/iuDTFuk.png
06:31:37 <arch> ignore the fact that it's pretty stupid economically speaking and adds a whole bunch of extra parts
06:32:53 <arch> do you think it would work if i assembled that?
06:33:55 <Kuschelpony> might work, if you are able to press the button with a few tenkiloherz
06:34:03 <Kuschelpony> might work, if you are able to press the button with a few ten Kiloherz
06:34:29 <Kuschelpony> otherwise there is muchmuchmuch not enough energy in the coil from a single spike
06:34:30 <arch> hmm, or what if i swapped the inductor with a 1000uH
06:35:21 <Kuschelpony> mmh i would expect something in the 100mH range and that gets into kilogram territory if it should have much less than one ohm
06:35:27 <arch> considering the quiescent current and parasitic losses of the ceramic caps would be quite low, i think it might be able to work. i can reasonably press the button at say 10Hz
06:36:13 <Kuschelpony> without serious calculations, i still estimate its an not practicable design,
06:36:34 <arch> now i want to make it on breadboard just to see what happens lol
06:37:11 <arch> i have definitely made a "manual boost" converter before on breadboard to charge up a capacitor. obviously running open loop, and only for the time kept pressing the button on and off
06:38:17 <arch> and it had powered a white LED. i used a 1x AAA battery and 100uH inductor and 10uF capacitor in that case.
06:38:44 <Kuschelpony> my suggestion for a starter circuit would be a led driver like a PR4401
06:39:32 <arch> yeah, that or a joule thief would work too
06:40:20 <Kuschelpony> or that
06:41:10 <arch> but the idea with the p-channel mosfet is solid right? it's basically the inverse of how a reverse polarity protection works with a n-mos on the ground side
06:41:36 <Kuschelpony> yes right
06:41:40 <arch> cool
06:41:45 <arch> thanks Kuschelpony
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08:59:27 <T3sl4> arch: offhand i'm guessing C1 depletes before C3-5 are nearly charged, and L2-C1 limits how much inrush the reg can draw once/if it starts
09:27:15 <arch> ty T3sl4
09:28:08 <arch> probably would work if i made the input bulk caps larger so it can hold more energy for the vrdrop on startup
09:29:04 <T3sl4> a switch could technically be made, with a snap action that slaps a contact on its way past, so it's not just momentary but just for one little hit of some ms long, give or take bounce, and bounce could even be harnessed to make it 100s us i suppose
09:29:26 <T3sl4> that would be a "fun" exercise but a lot of mechanics, heh
10:00:45 <steve30> i wish people wouldn't upload such big files to odysee
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15:59:01 <steve30> kitty
15:59:02 <steve30> https://www.reddit.com/r/ThinkCat/comments/1ofewk8/just_a_baby/
19:47:29 <steve30> this looks cool
19:47:29 <steve30> https://www.nokia3310lteproject.com
19:47:29 <EEVBot> [url] Nokia 3310 LTE Project | www.nokia3310lteproject.com
19:48:26 <DogWomble> Now if only they did that with a nokia 5110
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23:45:48 <MrMobodies> https://www.ispreview.co.uk/index.php/2025/10/energy-smart-meters-may-soon-link-via-uk-home-broadband-connectivity.html
23:45:48 <EEVBot> [url] Energy Smart Meters May Soon Link via UK Home Broadband Connectivity - ISPreview UK | www.ispreview.co.uk
23:46:10 <MrMobodies> Maybe the consumer could charge the energy provider for using their broadband
23:47:44 <MrMobodies> if meter is hacked by home owner, I wonder could they still be charged with tampering with a meter (concerned often based around safety)
23:48:46 <MrMobodies> I mean though the ethernet if energy providers provided ethernet modules for them
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