Path: ...!news-out.netnews.com!postmaster.netnews.com!us11.netnews.com!not-for-mail X-Trace: DXC=99=]RNmO9IIOFN9XTd4>2BU5[F2hIijDO7J470dMQQ7KHFjJ2MJUSTB;dFo]Kk\e]Db`aYgF[?o2L2CZ[\]^B[A@kHC^e>8oCm@m0=1g^O3cNO X-Complaints-To: support@frugalusenet.com Date: Fri, 14 Jun 2024 16:35:59 -0400 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Fast monostable with a transistpor array Newsgroups: sci.electronics.design References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> Content-Language: en-US From: bitrex In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Lines: 65 Message-ID: <666ca9ad$0$2363142$882e4bbb@reader.netnews.com> NNTP-Posting-Host: 127.0.0.1 X-Trace: 1718397357 reader.netnews.com 2363142 127.0.0.1:58545 Bytes: 3825 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: