Path: ...!local-1.nntp.ord.giganews.com!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sun, 16 Jun 2024 13:56:50 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: OT: some electronics for a speed controlled electromagnetic gun Date: Sun, 16 Jun 2024 06:56:50 -0700 Message-ID: <7nqt6j1uoakdnnqk37bvlj5vss03damatg@4ax.com> References: User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 91 X-Trace: sv3-kYdZ71PMWExFtWpI7Gx1EmZzq2zV7lqYORePpE50QK5/6uJPSzEcJ27RFb8Ec0w7OECr2BCod3VQOZn!KpmzTdXt/qoIKeUai37G+FkYfs5mpVWkL/dJUlxNVLR39toKYSOvMm6f/IJac3+pWJ/a5o5w1s/V!VMBHfg== X-Complaints-To: www.supernews.com/docs/abuse.html X-DMCA-Complaints-To: www.supernews.com/docs/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: 4193 On Sun, 16 Jun 2024 05:15:41 GMT, Jan Panteltje wrote: >On a sunny day (Sat, 15 Jun 2024 07:55:40 -0700) it happened john larkin > wrote in : > >>On Sat, 15 Jun 2024 05:57:23 GMT, Jan Panteltje >>wrote: >> >>>On a sunny day (Fri, 14 Jun 2024 09:21:24 -0700) it happened john larkin >>> wrote in : >>> >>>>On Fri, 14 Jun 2024 03:13:16 GMT, Jan Panteltje >>>>wrote: >>>> >>>>>New dart launcher may be better way to inject animals with drugs >>>>>Electromagnetic prototype could improve manufacturing >>>>> https://www.sciencedaily.com/releases/2024/06/240613161144.htm >>>>> >>>>>Here the circuit etc..: >>>>> https://www.mdpi.com/2227-7080/12/5/69 >>>> >>>>Fig 6 is horrible. >>>> >>>>Hardly anybody does good circuit design these days. >>> >>>Are you sure you understand the circuit? >>>What is wrong with it according to you? >> >>Aside from being ugly, at least three things. > >Name them!!! Am I the only person here who designs electronics? Sigh, OK. The resistive voltage divider R2 R3 wastes voltage and power. The SCR high-side switch is crazy for several reasons. The optocoupler into the second dc/dc converter makes no sense and is probably unreliable. Why do some people use optocouplers where both the input and output are grounded? It becomes a low-beta NPN transisor. Why switch only the second dc/dc converter? > > > >>>As to bad design, astronauts now stuck on the ISS because the Boeing return module is defective. >>>Billions they did spend of tax money >>>US becoming more and more a lost empire... >> >>That's fine, since the US never was an empire. But we did mostly >>conquer the world by being what other people want to be. >> >>Use Street View all over the world. Most places look like a suburb of >>Houston. >> >>> >>>China just did a sample return from the backside of the moon. >> >>Why? > >Human beings have curiosity >that is how we evolve. >The sample will teach us about how our universe (forming of the Moon specfically) happened. We already have lots of moon dirt. It's not very interesting. The Chinese thing is a political stunt. An expensive one. Why would dirt from the farside of he moon be any different from the rest of the moon dirt? >And if we can have a permanent base there, say as an in-between stop for further exploration of space. Space is mostly vacuum. Why do we need to kill humans to "explore" vacuum? >Later, when US astronuts land on Mars (if ever) they will find Chinese restaurants there >and they better bring some Chinese currency so they can pay forlanding rights and food. > A recent study suggests that people who go to Mars will have kidney damage. https://www.sciencedaily.com/releases/2024/06/240611130413.htm Humans in space make no sense.