Big crowbar module for <4VDC?
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From: Joerg on 18 Dec 2008 21:32 Jim Thompson wrote: > On Thu, 18 Dec 2008 16:10:36 -0800 (PST), Tim Williams > <tmoranwms(a)gmail.com> wrote: > >> On Dec 17, 7:12 pm, Jim Thompson <To-Email-Use-The-Envelope-I...(a)My- >> Web-Site.com> wrote: >>> Second question. You _are_ aware that the crowbar goes on the _input_ >>> side of the linear regulator, aren't you ?:-) >> Hey Jim, you respect AoE2 last I heard, right? Why, then, do they >> also recommend putting the crowbar at the output? Which is, >> incidentially, the logical place to put it when you want to protect >> $10k equipment powered by said supply anyway. Equipment >> supply, >> protect equipment. QED. >> >> Tim > > Pardon my quoting Maxim ;-)... > > http://www.maxim-ic.com/glossary/index.cfm/Ac/V/ID/1039/Tm/crowbar > > or Hobby Projects > > http://www.hobbyprojects.com/thyristor_triac_and_diac/thyristor_as_a_crowbar.html > Has the author ever heard of a gate trigger voltage? Assume 1.5V for now: Zener 5.1V plus Vgt = 6.6V. Phssst ... crackle ... pop ... *BANG* .... there goes the majority of connected logic chips. Many of those won't take anything above 6V. The proper way to do a crowbar is with a TL431. [...] -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Jim Thompson on 18 Dec 2008 21:37 On Thu, 18 Dec 2008 18:19:08 -0800, Joerg <notthisjoergsch(a)removethispacbell.net> wrote: [snip] > >Hey, maybe you should have done an apprenticeship under Earl William >Muntz before going to MIT ;-) My father had a policy of refusing to service Muntz TV's ;-) ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine Sometimes I even put it in the food
From: Jim Thompson on 18 Dec 2008 21:39 On Thu, 18 Dec 2008 18:32:11 -0800, Joerg <notthisjoergsch(a)removethispacbell.net> wrote: [snip] > >The proper way to do a crowbar is with a TL431. > >[...] Of course. TL431 was one of my jelly-bean-parts-of-choice during the mid '70's thru late '80's. ...Jim Thompson -- | James E.Thompson, P.E. | mens | | Analog Innovations, Inc. | et | | Analog/Mixed-Signal ASIC's and Discrete Systems | manus | | Phoenix, Arizona 85048 Skype: Contacts Only | | | Voice:(480)460-2350 Fax: Available upon request | Brass Rat | | E-mail Icon at http://www.analog-innovations.com | 1962 | I love to cook with wine Sometimes I even put it in the food
From: Joerg on 18 Dec 2008 21:51 Jim Thompson wrote: > On Thu, 18 Dec 2008 18:19:08 -0800, Joerg > <notthisjoergsch(a)removethispacbell.net> wrote: > > [snip] >> Hey, maybe you should have done an apprenticeship under Earl William >> Muntz before going to MIT ;-) > > My father had a policy of refusing to service Muntz TV's ;-) > I can understand why. I did the same in Germany, there was a brand named "Kuba" where I told neighbors that I won't fix those anymore. Hey, did you post a few MP3 tunes from your father yet? -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM.
From: Joerg on 18 Dec 2008 21:53
Jim Thompson wrote: > On Thu, 18 Dec 2008 18:32:11 -0800, Joerg > <notthisjoergsch(a)removethispacbell.net> wrote: > > [snip] >> The proper way to do a crowbar is with a TL431. >> >> [...] > > Of course. TL431 was one of my jelly-bean-parts-of-choice during the > mid '70's thru late '80's. > With me they still are. When I feel extra generous I might even spring for a TLV431 on regular circuits (not crowbars), but not often. -- Regards, Joerg http://www.analogconsultants.com/ "gmail" domain blocked because of excessive spam. Use another domain or send PM. |