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Groups > sci.electronics.design > #453935
| From | Sylvia Else <sylvia@not.at.this.address> |
|---|---|
| Newsgroups | sci.electronics.design |
| Subject | Re: Ignition circuit issue. |
| Date | 2017-03-28 11:13 +1100 |
| Message-ID | <ejto4gFgbh6U1@mid.individual.net> (permalink) |
| References | <ejoupmFhi4bU3@mid.individual.net> <dljedc94rmsgrh4gvv5ettk1tc26i4kivv@4ax.com> <ejp5l5FinsjU1@mid.individual.net> <97e92e25-4f48-4f6d-b18f-8b34df839ab7@googlegroups.com> |
On 28/03/2017 1:16 AM, dagmargoodboat@yahoo.com wrote: > On Sunday, March 26, 2017 at 2:33:13 AM UTC-4, Sylvia Else wrote: > >> Finally got the engine running today, using this ignition circuit, and >> LPG, after many hours spent cursing a PIC32MX that I was temporarily >> using to generate the trigger pulse - got caught out by yet another PIC >> errata - input capture doesn't work when the processor is in the idle state. >> >> Sylvia. > > Was that PIC quirk the problem? Otherwise, I'd ask > o Whether C4 might be bad, open, or the wrong value? No, and I even replaced it. Its value is far from critical anyway. > > Or, that not being the case, maybe the LT1243's upset about having its > FB pin pulled all the way to +5v (wind-up?)? It's within spec. Another possibility is that the LT1243 is interpreting the sudden drop in FB as an indicator of an output short, but if so, I'd expect it to object to every such occurrence, not just the first. > > Is the LT1243's Vref getting glitched from your reset circuit, upsetting > the LT? > > Just some wild ideas. From your description it really sounds like it's > RT/CT pin-related, and you've already put your finger on it (so to speak :). The IC is not really designed with this application in mind. Perhaps it just plain doesn't like being used this way. Sylvia.
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Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-26 15:36 +1100
Re: Ignition circuit issue. John Larkin <jjlarkin@highlandtechnology.com> - 2017-03-25 22:33 -0700
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-26 17:33 +1100
Re: Ignition circuit issue. Larry Sheldon <lfsheldon@gmail.com> - 2017-03-27 00:54 -0500
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-27 19:34 +1100
Re: Ignition circuit issue. dagmargoodboat@yahoo.com - 2017-03-27 07:16 -0700
Re: Ignition circuit issue. makolber@yahoo.com - 2017-03-27 09:18 -0700
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-28 11:13 +1100
Re: Ignition circuit issue. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-27 16:25 -0700
Re: Ignition circuit issue. Lasse Langwadt Christensen <langwadt@fonz.dk> - 2017-03-27 16:31 -0700
Re: Ignition circuit issue. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-27 16:36 -0700
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-28 15:19 +1100
Re: Ignition circuit issue. Neon John <no@never.com> - 2017-03-31 14:41 -0400
Re: Ignition circuit issue. Jim Thompson <To-Email-Use-The-Envelope-Icon@On-My-Web-Site.com> - 2017-03-31 11:55 -0700
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-28 12:03 +1100
Re: Ignition circuit issue. piglet <erichpwagner@hotmail.com> - 2017-03-28 08:39 +0100
Re: Ignition circuit issue. Sylvia Else <sylvia@not.at.this.address> - 2017-03-28 20:54 +1100
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