Path: ...!Xl.tags.giganews.com!local-2.nntp.ord.giganews.com!nntp.supernews.com!news.supernews.com.POSTED!not-for-mail NNTP-Posting-Date: Sat, 15 Jun 2024 15:47:19 +0000 From: john larkin Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Sat, 15 Jun 2024 08:47:19 -0700 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> <666ca9ad$0$2363142$882e4bbb@reader.netnews.com> <666d1cc3$0$2363142$882e4bbb@reader.netnews.com> User-Agent: ForteAgent/8.00.32.1272 MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Transfer-Encoding: 7bit Lines: 81 X-Trace: sv3-G2SsVlxyoM60xzTQ4T4CAio9e4L1/STrX9mISZeqDtJroFYDqRSfWUOQRBXFVfGiE8KVKkhH4Xq8SS3!y3D9fMKABdY1wqFqWY8f1C+IG/MHW7/Vs9GVPdhr64jWpsHBgaRH6JuV22WnKpszzBPmeqhyg4mF!hjMYMw== 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: 4842 On Sat, 15 Jun 2024 00:47:00 -0400, bitrex wrote: >On 6/14/2024 7:10 PM, john larkin wrote: >> On Fri, 14 Jun 2024 16:35:59 -0400, bitrex wrote: >> >>> On 6/14/2024 12:33 PM, john larkin wrote: >>>> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde" >>>> wrote: >>>> >>>>> "john larkin" wrote in message news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com... >>>>>> On Fri, 14 Jun 2024 11:08:56 -0400, "Edward Rawde" >>>>>> wrote: >>>>>> >>>>>>> >>>>>>> "john larkin" wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com... >>>>>>>> On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde" >>>>>>>> wrote: >>>>>>>> >>>>>>>>> "Bill Sloman" wrote in message news:v4f2nm$2augj$1@dont-email.me... >>>>>>>>>> One option John Larjkin doesn't seem to have explored is using Renesas HFA3096 five transistor array as basis for his >>>>>>>>>> mononstable >>>>>>>>>> and level shifter. >>>>>>>>>> >>>>>>>>>> It offers three 8GHz NPN parts and two 5.5GHz PNP parts in a single array. >>>>>>>>>> >>>>>>>>>> https://www.renesas.com/us/en/document/dst/hfa3046-hfa3096-hfa3127-hfa3128-datasheet?r=494216 >>>>>>>>>> >>>>>>>>> >>>>>>>>> I put the NPN model parameters into a circuit designed by yourself. >>>>>>>>> It's late now but I got as far as Time step too small. >>>>>>>>> >>>>>>>> >>>>>>>> That is neither fast nor a monostable. >>>>>>> >>>>>>> Yes ok it's an astable and certainly not intended to be fast. >>>>>>> It was intended only to see if the model worked. Nothing more. >>>>>> >>>>>> It doesn't work! >>>>>> >>>>>>> >>>>>>>> >>>>>>>> There's no reason to use many-GHz parts in micropower circuits. One >>>>>>>> reason is that the sim breaks. >>>>>> >>>>>> Most versions of the HFA3046 are obsolete. The only one left at >>>>>> Digikey costs $12. It would be risky to design around that part. >>>>> >>>>> If it's obsolete or going obsolete then yes it would make no sense to use it. >>>>> I would guess that you get to do plenty of work because a manufacturer has suddenly decided to discontinue a part. >>>>> >>>>>> Wasn't HFA originally a Harris part? >>>>>> >>>>>> There are lots of dual (non-monolithic) diodes and bipolars and fets >>>>>> around, but the monolithic arrays are mostly gone. >>>>> >>>>> What part would you recommend (single or dual) and does it have a working LTSpice model? >>>> >>>> Just pull up some parts from the standard library, some low current >>>> NPNs like BC547 maybe. Look for low capacitances if you care about >>>> that; the HFAs are good in that respect. >>>> >>>> Why do people avoid making clean 4-wire connections on schematics? >>> >>> There's this new trend of breaking the circuit schematic up into little >>> boxes like this, it's nuts: >>> >>> >>> >>> >> >> That's criminal. >> > >Combining schematics and documentation in the same document is sort of >like a toothpaste and orange juice smoothie. I like orange juice, and >toothpaste is useful. However... We keep a separate design notes folder. It can say a lot more than could be hacked onto a schematic. I don't like a lot of comments on my schematics.