Path: Xl.tags.giganews.com!local-1.nntp.ord.giganews.com!news.giganews.com.POSTED!not-for-mail NNTP-Posting-Date: Thu, 09 May 2024 18:38:38 +0000 From: Joe Gwinn Newsgroups: sci.electronics.design Subject: Re: Genocide Joe is beginning to stink like Lyndon B. Johnson Date: Thu, 09 May 2024 14:38:38 -0400 Message-ID: References: <663beb6f$0$8094$882e4bbb@reader.netnews.com> <57vn3jh7rj8avvop51ocgcqt2697gbe01o@4ax.com> <663c0d82$0$8477$882e4bbb@reader.netnews.com> <1dbo3jd021lv1j79d8c1mn375dtqneb1io@4ax.com> <663c4480$0$6430$882e4bbb@reader.netnews.com> <663ce726$0$7070$882e4bbb@reader.netnews.com> <663cefd7$0$7067$882e4bbb@reader.netnews.com> <3k1q3j98ugb5tnco15r919231d9i8kk5qj@4ax.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1 Content-Transfer-Encoding: 8bit Lines: 117 X-Usenet-Provider: http://www.giganews.com X-Trace: sv3-DE3x8ng1wjGlWtdrqmPEkCJnWZSedFlKUndUedEIeXEf8CmU7/sxXVLMLAiPewcC3XUaaY/8R8OTfc7!7pFce7V2/bY5uE7ABJ7KzvMsaKw4ONIz6HeAj9F8LipQtsCxbmKz67K12FXZCqesqrqDAWI= X-Complaints-To: abuse@giganews.com X-DMCA-Notifications: http://www.giganews.com/info/dmca.html X-Abuse-and-DMCA-Info: Please be sure to forward a copy of ALL headers X-Abuse-and-DMCA-Info: Otherwise we will be unable to process your complaint properly X-Postfilter: 1.3.40 Bytes: 5968 On Thu, 09 May 2024 10:24:57 -0700, john larkin wrote: >On Thu, 9 May 2024 11:46:31 -0400, bitrex wrote: > >>On 5/9/2024 11:33 AM, John Larkin wrote: >>> On Thu, 9 May 2024 11:09:26 -0400, bitrex wrote: >>> >>>> On 5/9/2024 10:06 AM, John Larkin wrote: >>>>> On Wed, 8 May 2024 23:35:28 -0400, bitrex wrote: >>>>> >>>>>> On 5/8/2024 10:04 PM, John Larkin wrote: >>>>>>> On Wed, 8 May 2024 19:40:49 -0400, bitrex wrote: >>>>>>> >>>>>>>> On 5/8/2024 6:32 PM, john larkin wrote: >>>>>>>>> On Wed, 8 May 2024 17:15:27 -0400, bitrex wrote: >>>>>>>>> >>>>>>>>>> On 5/8/2024 10:28 AM, John Larkin wrote: >>>>>>>>>> >>>>>>>>>>>> Jill Biden reportedly told her husband some time ago to “Stop it, Joe, >>>>>>>>>>>> stop it now.” Good advice that he continues to ignore — at his peril, >>>>>>>>>>>> and ours. >>>>>>>>>>>> >>>>>>>>>>>> https://mondoweiss.net/2024/05/genocide-joe-is-beginning-to-stink-like-lyndon-b-johnson/ >>>>>>>>>>>> >>>>>>>>>>> >>>>>>>>>>> What's your favorite SiC mosfet? >>>>>>>>>>> >>>>>>>>>> >>>>>>>>>> Why no buy WOLFSPEED: >>>>>>>>>> >>>>>>>>>> >>>>>>>>> >>>>>>>>> What's wrong with that one? >>>>>>>>> >>>>>>>>> I've used C2M0280120D and it works fine. Gate drive is a nuisance, but >>>>>>>>> that's true for all pure SiC parts. >>>>>>>>> >>>>>>>> >>>>>>>> Ope, I meant to write "why not buy...", it looked like a nice part. More >>>>>>>> standoff voltage than I'm accustomed to requiring for most projects, >>>>>>>> though. >>>>>>>> >>>>>>>> I may have a need to roll my own hysteric synchronous buck soon, at an >>>>>>>> astounding 12V.. >>>>>>>> >>>>>>> >>>>>>> That's not SiC territory. Possibly GaN if you want a tiny MHz >>>>>>> switcher. >>>>>>> >>>>>>> SiC has amazingly low capacitances compared to high-voltage silicon. >>>>>>> But the gates have to swing to levels like +15 and -5. Fast. >>>>>>> >>>>>>> Why design a switcher, unless it's for fun. You can get a whole 2-amp >>>>>>> buck switcher, great internal reference, current and thermal limited, >>>>>>> spread spectrum, for 19 cents. >>>>>> >>>>>> >>>>>> Indeed there's lots of stuff off the shelf but for the application I >>>>>> have in mind the it's is acting more like a low frequency >>>>>> self-oscillating Class D, tracking a control voltage. >>>>> >>>>> I have two current designs where I muck the feedback node of a >>>>> spread-spectrum switcher chip to use it as either a programmable power >>>>> supply, or an amplifier. >>>>> >>>>> The simple one powers about 130 12-volt relays. We run them at 12 >>>>> volts whenever we reprogram them, and after a few milliseconds drop >>>>> down to 8 volts to save power. >>>>> >>>>>> >>>>>>> Eventually some damned IC jock intgrates our fun circuits. >>>>>> >>>>>> It's the future now, we can design our own mixed-signal ICs at the local >>>>>> Starbucks, the IC jocks don't have to have all the fun. >>>>>> >>>>>> >>>>>> >>>>>> And I can integrate some other functions, too. Look at all the fun parts >>>>>> you get for 40 cents in small quantity. These things have been solid >>>>>> money-makers for me so far >>>>>> >>>>> >>>>> People keep re-inventing the "analog FPGA" but none seem to AFbeen >>>>> successful. There must be some deep fundamental reason why. >>>> >>>> Inertia? Have to use your brain? >>>> >>>>> OTP on a leadless package isn't appealing. >>>>> >>>>> A fierce uP with flash memory and some ADC and DAC channels is more >>>>> useful. >>>> >>>> There aren't a lot of fierce uPs at the price, not ones with >>>> well-documented tookits and APIs in English, anyway. >>>> >>> >>> RP2040. >> >>Actually I probably don't need anything as complicated as an integrated >>buck converter controller, anyway. Hard to believe this topology is >>patented but I guess so long as I don't use something similar for >>"digital audio"?? >> >> >> >> >> >> > >That's crazy. It's obvious, trivial, and ancient. > >But the US Patent Office is a revenue center now. It was patented in 2008 as US 7456,685, which expires in 2026. Maybe not obvious back in 2006. Joe Gwinn