| 00:08.35 | wpwrak | hmm. another one goes up on smoke. seems that some current-limiting may be beneficial :) |
| 00:25.36 | wpwrak | well, another FET could detect if Vout < ~0.7 V and trigger an interrupt. or directly cut power |
| 00:27.11 | wpwrak | and a 1 Ohm series could further limit inrush current. just in case |
| 02:17.41 | *** join/#qi-hardware atommann (~atommann@58.251.2.94) |
| 03:01.57 | wpwrak | whitequark: also tried a load step from ~100 Ohm to ~18 Ohm (at 1.8 V). i can't see any voltage change. not sure if this is good or bad ;-) |
| 03:02.48 | wpwrak | at least the FET, 3rd in this role, didn't go up in smoke :) |
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| 06:33.52 | DocScrutinizer05 | huhà life in here? |
| 06:35.38 | DocScrutinizer05 | (<wpwrak> i wonder if this simple adjustable regulator could actually work) it would, but pretty poor efficiency |
| 06:40.05 | DocScrutinizer05 | so it's OK for very low loads (except you'd still want a dedicated series resistor in line with D-S of FET), but for real supply it burns exactly same amount of energy like a linear regulator |
| 06:41.40 | DocScrutinizer05 | while introducing nasty noise |
| 06:43.36 | DocScrutinizer05 | actually it doesn't introduce any noise when that's an opamp and not a comparator (with hysteresis), since then your FET does work in linear range and not switched like you implied |
| 06:44.35 | DocScrutinizer05 | you should add some small buffer capacitor on output of opamp, to avoid it starting oscillation |
| 06:47.24 | DocScrutinizer05 | the problem with your design though seems that you want to use a *comparator* in a MCU |
| 06:47.37 | DocScrutinizer05 | this won't fly |
| 06:48.15 | DocScrutinizer05 | unless you intentionally design in some RC elements that determine the oscilation frequency |
| 06:49.45 | DocScrutinizer05 | your design best case is using the output buffer C and the assumed Ron of FET as such determining values, and that means you _will_ get wild oscillation at least in the magnitude of comparator's hysteresis |
| 06:50.18 | DocScrutinizer05 | oooh, and of cours Rload for discharge of the buffer C |
| 06:51.25 | DocScrutinizer05 | in theory the circuit works. In practice it's a nasty critter hard to tame and get stable |
| 06:53.51 | DocScrutinizer05 | wpwrak: you probbaly should add a R-C lowpass/integrator after the comparator output and drive the FET gate from that integrated analog voltage |
| 06:54.36 | DocScrutinizer05 | that might actually work and result in a semi-usable and semi-stable output voltage |
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| 06:59.26 | eintopf | hi DocScrutinizer05 :-) |
| 07:32.44 | DocScrutinizer05 | hi! |
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| 11:21.11 | wpwrak | (RC) naw, that would defeat the idea of operating in switched mode. what i want is to minimize the power burnt in the FET, so i want it either all on or all off |
| 11:23.17 | wpwrak | so far, the critter seems to work suspiciously well, but with a slight tendency of regulating too high with fast settings |
| 11:24.33 | wpwrak | what is a little odd is that it drives the FET with bursts of pulses. so yes, there's more noise than strictly necessary |
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| 15:13.11 | eintopf | in germany it's hotter than in buenos aires |
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| 16:14.13 | larsc | only 27degree C in the office... |
| 16:14.55 | wpwrak | eintopf: winter here ... |
| 16:41.28 | wpwrak | so much about the $9 PC: https://olimex.wordpress.com/2015/06/05/how-to-get-in-the-news-tell-people-that-you-will-make-and-sell-something-which-cost-you-20-for-9/ |
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| 18:12.32 | DocScrutinizer05 | roh: CCC? |
| 18:12.39 | DocScrutinizer05 | BER? |
| 18:15.39 | roh | ??? |
| 18:18.38 | DocScrutinizer05 | https://events.ccc.de/camp/2015/wiki/Village:BER |
| 18:19.36 | DocScrutinizer05 | by: http://www.raumfahrtagentur.org/ |
| 18:21.15 | DocScrutinizer05 | Just wondered if you'll be there |
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| 19:04.15 | roh | DocScrutinizer05: sure |
| 19:04.23 | roh | no clue about details yet |
| 19:06.15 | DocScrutinizer05 | me neither |
| 19:06.36 | DocScrutinizer05 | but I might want a "village" with a tad of advertising for Neo900 |
| 19:07.08 | DocScrutinizer05 | if anybody gets the point about that project, then the CCC visitors |
| 19:15.23 | roh | hehe... so the project is still on track? |
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| 19:27.34 | eintopf | mhh, the camp |
| 19:35.41 | DocScrutinizer05 | roh: well, sort of, yes |
| 19:36.54 | DocScrutinizer05 | more and more organizational crap getting in the way though, time sinks everywhere. Webshop, PayPal, markiting and PR and whatnot |
| 19:37.15 | eintopf | DocScrutinizer05: you are from russia moscow? |
| 19:37.23 | eintopf | and wants to tracel to the camp? |
| 19:37.26 | DocScrutinizer05 | hmm, why? |
| 19:37.45 | eintopf | I had something like that in my mind :/ |
| 19:37.54 | DocScrutinizer05 | nah, never seen Russia |
| 19:38.15 | DocScrutinizer05 | ~weather eddn |
| 19:43.03 | eintopf | oh yes |
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| 23:56.54 | *** topic/#qi-hardware is Copyleft hardware - http://qi-hardware.com | hardware hackers join here to discuss Ben NanoNote, atben/atusb 802.15.4 wireless, anelok and other community driven hw projects | public logging at http://en.qi-hardware.com/irclogs and http://irclog.whitequark.org/qi-hardware |
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