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From: john larkin <jl@650pot.com>
Newsgroups: sci.electronics.design
Subject: Re: Fast monostable with a transistpor array
Date: Sat, 15 Jun 2024 08:47:19 -0700
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On Sat, 15 Jun 2024 00:47:00 -0400, bitrex <user@example.net> wrote:

>On 6/14/2024 7:10 PM, john larkin wrote:
>> On Fri, 14 Jun 2024 16:35:59 -0400, bitrex <user@example.net> wrote:
>> 
>>> On 6/14/2024 12:33 PM, john larkin wrote:
>>>> On Fri, 14 Jun 2024 12:18:23 -0400, "Edward Rawde"
>>>> <invalid@invalid.invalid> wrote:
>>>>
>>>>> "john larkin" <jl@650pot.com> wrote in message news:8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com...
>>>>>> On Fri, 14 Jun 2024 11:08:56 -0400, "Edward Rawde"
>>>>>> <invalid@invalid.invalid> wrote:
>>>>>>
>>>>>>>
>>>>>>> "john larkin" <jl@650pot.com> wrote in message news:hilo6j9dgctalpiu4v09rpdavf6fetm1cv@4ax.com...
>>>>>>>> On Thu, 13 Jun 2024 23:25:37 -0400, "Edward Rawde"
>>>>>>>> <invalid@invalid.invalid> wrote:
>>>>>>>>
>>>>>>>>> "Bill Sloman" <bill.sloman@ieee.org> 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:
>>>
>>> <https://hackaday.com/wp-content/uploads/2024/05/hadimg_desrev_ltc4040_6.png>
>>>
>>>
>> 
>> 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.