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Groups > sci.electronics.design > #452475
| From | Winfield Hill <hill@rowland.harvard.edu> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: bad, better delay circuits |
| Date | 2017-03-18 12:29 -0700 |
| Organization | Rowland Institute |
| Message-ID | <oak1qk0un7@drn.newsguy.com> (permalink) |
| References | <1roqcclua35sdrn6jduc9q0folr3fg8oqu@4ax.com> |
John Larkin wrote...
>
> The second circuit looks better.
I'm using diodes to reset 22pF caps for some
variable nanosecond-delay circuits. Variable
pullup, 220-ohm plus 1k pot. Works well, but
the issue is what diode? Need a relatively
high-current capability for rapid cycling, but
a moderately low capacitance across the 22pF.
Ended up with SD103AW, accept the added 15pF.
SD101AW is only 1.5pF, but too wimpy. Didn't
find a small compromise Schottky diode.
What'd you choose?
In another case, used 74LVC1G125 or 126 to
discharge the cap, that worked even better.
Ground logic input, control with OE pin.
Very speedy discharge and release. Remote
time delay adjustment with voltage to LVDS.
https://www.dropbox.com/s/d1axmzcwdl0bvly/3-state-delay-timer.JPG?dl=0
--
Thanks,
- Win
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bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 10:04 -0700
Re: bad, better delay circuits Winfield Hill <hill@rowland.harvard.edu> - 2017-03-18 12:29 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 16:15 -0700
Re: bad, better delay circuits Winfield Hill <hill@rowland.harvard.edu> - 2017-03-18 19:08 -0700
Re: bad, better delay circuits "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-18 17:02 -0500
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 16:25 -0700
Re: bad, better delay circuits rickman <gnuarm@gmail.com> - 2017-03-18 19:40 -0400
Re: bad, better delay circuits dagmargoodboat@yahoo.com - 2017-03-19 10:42 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-19 15:37 -0700
Re: bad, better delay circuits "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-19 22:24 -0500
Re: bad, better delay circuits dagmargoodboat@yahoo.com - 2017-03-20 08:58 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-20 09:42 -0700
Re: bad, better delay circuits Robert Baer <robertbaer@localnet.com> - 2017-03-20 23:55 -0800
Re: bad, better delay circuits "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-21 00:46 -0500
Re: bad, better delay circuits bill.sloman@ieee.org - 2017-03-21 22:54 -0700
Re: bad, better delay circuits "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-22 02:10 -0500
Re: bad, better delay circuits rickman <gnuarm@gmail.com> - 2017-03-19 18:47 -0400
Re: bad, better delay circuits Clifford Heath <no.spam@please.net> - 2017-03-20 09:55 +1100
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-19 16:12 -0700
Re: bad, better delay circuits "Tim Williams" <tiwill@seventransistorlabs.com> - 2017-03-19 10:32 -0500
Re: bad, better delay circuits Clifford Heath <no.spam@please.net> - 2017-03-19 13:36 +1100
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-18 19:44 -0700
Re: bad, better delay circuits Clifford Heath <no.spam@please.net> - 2017-03-19 15:58 +1100
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-19 15:43 -0700
Re: bad, better delay circuits Winfield Hill <hill@rowland.harvard.edu> - 2017-03-19 17:54 -0700
Re: bad, better delay circuits Clifford Heath <no.spam@please.net> - 2017-03-20 12:44 +1100
Re: bad, better delay circuits Winfield Hill <hill@rowland.harvard.edu> - 2017-03-20 12:22 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-20 15:49 -0700
Re: bad, better delay circuits whit3rd <whit3rd@gmail.com> - 2017-03-18 23:51 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-19 08:22 -0700
Re: bad, better delay circuits George Herold <gherold@teachspin.com> - 2017-03-20 17:55 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-22 08:54 -0700
Re: bad, better delay circuits JM <dontreplytothis173@gmail.com> - 2017-03-22 16:02 +0000
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-22 09:47 -0700
Re: bad, better delay circuits Winfield Hill <hill@rowland.harvard.edu> - 2017-03-22 10:31 -0700
Re: bad, better delay circuits John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-22 10:52 -0700
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