Path: ...!news.misty.com!weretis.net!feeder9.news.weretis.net!usenet.blueworldhosting.com!diablo1.usenet.blueworldhosting.com!nnrp.usenet.blueworldhosting.com!.POSTED!not-for-mail From: "Edward Rawde" Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Sat, 15 Jun 2024 00:56:47 -0400 Organization: BWH Usenet Archive (https://usenet.blueworldhosting.com) Lines: 70 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> <666ca9ad$0$2363142$882e4bbb@reader.netnews.com> Injection-Date: Sat, 15 Jun 2024 04:56:50 -0000 (UTC) Injection-Info: nnrp.usenet.blueworldhosting.com; logging-data="82903"; mail-complaints-to="usenet@blueworldhosting.com" Cancel-Lock: sha1:E/RH9daAkzwNi8xPbQfPj/ivN14= sha256:9FsO9T38nQ/gnXe4rU8gtf0tHAQ0DRooC2B3pqByMS4= sha1:OXvwgag/xKM3ZnwuiDUJ6nDe/Ks= sha256:J3Fi6WV274LJpw8/ZX70fdl43IBXN8oiAjZmr6xekgI= X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.6157 X-RFC2646: Format=Flowed; Response X-MSMail-Priority: Normal X-Newsreader: Microsoft Outlook Express 6.00.2900.5931 X-Priority: 3 Bytes: 4348 "bitrex" wrote in message news:666ca9ad$0$2363142$882e4bbb@reader.netnews.com... > 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: > > Reminds me of IEC logic symbols. Another example of nuts. > > >