Path: ...!eternal-september.org!feeder3.eternal-september.org!news.eternal-september.org!.POSTED!not-for-mail From: piglet Newsgroups: sci.electronics.design Subject: Re: Fast monostable with a transistpor array Date: Fri, 14 Jun 2024 18:59:59 +0100 Organization: A Patent noisesome spinner Lines: 109 Message-ID: References: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit Injection-Date: Fri, 14 Jun 2024 19:59:59 +0200 (CEST) Injection-Info: dont-email.me; posting-host="e46204b4e6e19ff842968af5713a467c"; logging-data="3150824"; mail-complaints-to="abuse@eternal-september.org"; posting-account="U2FsdGVkX19SvwRxNhXezUeAxvRkc56D" User-Agent: Mozilla Thunderbird Cancel-Lock: sha1:Ki/jtSl4lKHvaqWHGlM/hLAPycg= Content-Language: en-US In-Reply-To: <8epo6jhf5k5nbkkqp5ot9b6nq1lhoia870@4ax.com> Bytes: 4379 On 14/06/2024 17:03, john larkin wrote: > 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! > Yeah, there is something very wrong with that transistor model. Here is an emitter coupled multivib that can run fast. Should be possible somehow to gate it into being a monostable - worst case wrap a latch around it so it runs just one pulse? Version 4 SHEET 1 2848 1304 WIRE -512 528 -752 528 WIRE -336 528 -512 528 WIRE -336 576 -336 528 WIRE -752 624 -752 528 WIRE -512 672 -512 528 WIRE -336 688 -336 656 WIRE -224 688 -336 688 WIRE -336 720 -336 688 WIRE -336 720 -448 720 WIRE -336 752 -336 720 WIRE -752 800 -752 704 WIRE -656 800 -752 800 WIRE -224 800 -272 800 WIRE -656 832 -656 800 WIRE -224 848 -224 800 WIRE -752 880 -752 800 WIRE -512 880 -512 768 WIRE -448 880 -512 880 WIRE -336 880 -336 848 WIRE -336 880 -384 880 WIRE -512 944 -512 880 WIRE -336 944 -336 880 WIRE -752 1072 -752 960 WIRE -512 1072 -512 1024 WIRE -512 1072 -752 1072 WIRE -336 1072 -336 1024 WIRE -336 1072 -512 1072 FLAG -224 848 0 FLAG -656 832 0 FLAG -224 688 out SYMBOL VOLTAGE -752 608 R0 SYMATTR InstName V1 SYMATTR Value 5 SYMBOL npn -448 672 M0 SYMATTR InstName Q1 SYMATTR Value 2SC3838K SYMBOL npn -272 752 M0 SYMATTR InstName Q2 SYMATTR Value 2SC3838K SYMBOL VOLTAGE -752 864 R0 SYMATTR InstName V2 SYMATTR Value 5 SYMBOL res -352 560 R0 SYMATTR InstName R2 SYMATTR Value 390 SYMBOL cap -384 864 R90 WINDOW 0 0 32 VBottom 2 WINDOW 3 32 32 VTop 2 SYMATTR InstName C1 SYMATTR Value 5p SYMBOL res -528 928 R0 SYMATTR InstName R3 SYMATTR Value 1k SYMBOL res -352 928 R0 SYMATTR InstName R4 SYMATTR Value 1k TEXT -816 1112 Left 0 !.tran 100u TEXT -120 976 Left 2 ;EPW SED JUN 2024 TEXT -264 1064 Left 2 ;FAST ASTABLE MULTIVIBRATOR TEXT -120 1032 Left 2 ;EMITTER COUPLED TEXT -144 848 Left 1 ;TRADITIONALLY SHOWN WITH TEXT -176 872 Left 1 ;CURRENT SOURCES FOR EMITTERS TEXT -160 896 Left 1 ;TRY CHANGING R3 R4 FOR 5mA ? TEXT -152 552 Left 1 ;ALTERNATIVE OUTPUT CAN BE TEXT -192 576 Left 1 ;TAKEN ACROSS R IN Q1 COLLECTOR piglet