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Groups > sci.electronics.components > #6389
| Subject | Re: IC test clip with LEDs |
|---|---|
| Newsgroups | sci.electronics.components, sci.electronics.misc |
| References | <pq85b0$f6c$1@dont-email.me> <pq8ddt$k9h$1@gioia.aioe.org> <pqad0s$ckg$1@dont-email.me> |
| From | Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> |
| Date | 2018-10-23 12:08 -0400 |
| Message-ID | <lv2dndSWmcb-2lLGnZ2dnUU7-W3NnZ2d@supernews.com> (permalink) |
Cross-posted to 2 groups.
On 10/18/2018 12:39 PM, James Harris wrote: > On 17/10/2018 23:34, Computer Nerd Kev wrote: >> In sci.electronics.components James Harris >> <james.harris.1@gmail.com> wrote: >>> I remember years ago seeing a clip that would fit over an IC and >>> show the logic state of each pin on an LED (or an LED pair). >>> Something like this >>> >>> https://uk.farnell.com/3m/923690-08/test-clip-dil-8way/dp/178270 >>> >>> Do such clips still exist but with LEDs on top and what are they >>> called? >> >> This is my take on such a device: >> http://computernerdkev.heliohost.org/logicvis/index.htm >> >> Another DIY design was published in the Aug. 1987 issue of the >> Australian version of "Electronics Today International", with the >> largely inaccurate name of "In-Circuit Digital IC Tester". >> Therefore I made it available on my webpage about DIY IC tester >> designs: http://computernerdkev.heliohost.org/ictesters/index.htm > > That brings back memories! > >> >> As noted in my description there, it powers the LEDs from the >> outputs of the chip that it's clipped to, which might cause issues >> in circuits that can't supply enough extra current. >> >> Similar pre-built devices were sold at the same time, but I don't >> know of any still available. > > I wonder why they fell out of favour. They aren't much use for anything faster than a burglar alarm. Usually they just told you high, low or 'pulsing'. Nobody builds burglar alarms out of TTL anymore. > Is there a better way to monitor > digital ICs in-circuit these days? A logic analyzer. You can get slow USB ones for under $100, and pretty fast ones for $300. Cheers Phil Hobbs -- Dr Philip C D Hobbs Principal Consultant ElectroOptical Innovations LLC / Hobbs ElectroOptics Optics, Electro-optics, Photonics, Analog Electronics Briarcliff Manor NY 10510 http://electrooptical.net https://hobbs-eo.com
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IC test clip with LEDs James Harris <james.harris.1@gmail.com> - 2018-10-17 21:16 +0100
Re: IC test clip with LEDs not@telling.you.invalid (Computer Nerd Kev) - 2018-10-17 22:34 +0000
Re: IC test clip with LEDs James Harris <james.harris.1@gmail.com> - 2018-10-18 17:39 +0100
Re: IC test clip with LEDs Ralph Mowery <rmowery28146@earthlink.net> - 2018-10-18 12:48 -0400
Re: IC test clip with LEDs not@telling.you.invalid (Computer Nerd Kev) - 2018-10-18 21:51 +0000
Re: IC test clip with LEDs James Harris <james.harris.1@gmail.com> - 2018-10-20 11:50 +0100
Re: IC test clip with LEDs Computer Nerd Kev <not@telling.you.invalid> - 2018-10-21 08:19 +0000
Re: IC test clip with LEDs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-23 12:08 -0400
Re: IC test clip with LEDs jjhudak4@gmail.com - 2018-10-23 11:40 -0700
Re: IC test clip with LEDs Phil Hobbs <pcdhSpamMeSenseless@electrooptical.net> - 2018-10-25 09:46 -0400
Re: IC test clip with LEDs "jfeng@my-deja.com" <jfeng@my-deja.com> - 2018-10-17 15:56 -0700
Re: IC test clip with LEDs James Harris <james.harris.1@gmail.com> - 2018-10-18 17:40 +0100
Re: IC test clip with LEDs three_jeeps <jjhudak@gmail.com> - 2018-10-18 13:41 -0700
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