---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 07/20/13: 11 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:57 AM - Re: Battery capacity tester- Why isn't there a flyback diode? (user9253) 2. 09:21 AM - Re: Battery capacity tester-was flyback diode, now clock source (Mark Todd) 3. 09:38 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III) 4. 10:56 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Roger & Jean) 5. 11:02 AM - jumpimg gauge needles (bob noffs) 6. 11:23 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (JOHN TIPTON) 7. 11:59 AM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Bill) 8. 01:02 PM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III) 9. 01:06 PM - Re: jumpimg gauge needles (Robert L. Nuckolls, III) 10. 02:15 PM - Re: jumpimg gauge needles (bob noffs) 11. 03:22 PM - Re: Re: Battery capacity tester-was flyback diode, now clock source (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:57:54 AM PST US Subject: AeroElectric-List: Re: Battery capacity tester- Why isn't there a flyback diode? From: "user9253" A quartz clock with hands can be used instead of an AC powered clock. Strip the ends of two wires. Flatten the ends with a hammer and anvil. Make a sandwich of the two flattened wires with a paper or plastic insulator between them. Place this sandwich in the clock battery holder between the AA battery and a holder contact. Connect the other ends of the two wires to the tester relay. Joe -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=404970#404970 ________________________________ Message 2 _____________________________________ Time: 09:21:57 AM PST US From: Mark Todd Subject: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source > From: "Eric M. Jones" > > > There probably should be a "flyback" diode there. Actually I've been searching > the antique shops for an AC plug-in clock and haven't been able to find one. I went ahead and added the coil diode per yours and Bob's advice. As for the clock, I gave up on finding an AC clock. I didn't want an AC dependent time piece anyway. I just piggy-backed an 8V regulator (MC7808C) I had on hand and a couple of resistors for a voltage divider to give me a regulated 1.8 volt supply that seems to work just fine with the quartz clock I got at Goodwill for $1. Boy, that 55W light bulb sure gets warm after a few minutes. I bet a big ol' heat sink and a surplus computer cooling fan would probably extend bulb life. Back to the workbench! Mark ________________________________ Message 3 _____________________________________ Time: 09:38:22 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source >I went ahead and added the coil diode per yours and Bob's advice. As >for the clock, I gave up on finding an AC clock. I didn't want an >AC dependent time piece anyway. I just piggy-backed an 8V regulator >(MC7808C) I had on hand and a couple of resistors for a voltage >divider to give me a regulated 1.8 volt supply that seems to work >just fine with the quartz clock I got at Goodwill for $1. Good workaround . . . >Boy, that 55W light bulb sure gets warm after a few minutes. I bet >a big ol' heat sink and a surplus computer cooling fan would >probably extend bulb life. Back to the workbench! Yeah, they do. Not sure how you would heat sink it . . . most of the energy is radiated. But a fan would help. A salvaged 12v cooling fan from a computer should be low-cost option. The one I'm finishing up on the bench has 3 lamps. Let me know how the fan thingy works out for you. I might just do the same thing with this one. Bob . . . ________________________________ Message 4 _____________________________________ Time: 10:56:13 AM PST US From: "Roger & Jean" Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source >>Boy, that 55W light bulb sure gets warm after a few minutes. I bet a big >>ol' heat sink and a surplus computer cooling fan would probably extend >>bulb life. Back to the workbench! > > Yeah, they do. Not sure how you would heat sink > it . . . most of the energy is radiated. But a fan > would help. A salvaged 12v cooling fan from a computer > should be low-cost option. The one I'm finishing up > on the bench has 3 lamps. Let me know how the fan > thingy works out for you. I might just do the same > thing with this one. I understood that these lamps were designed to work for many 100's of hours without any form of cooling, other than ambient air. If this is the case, then I do not see much advantage in going to the $effort$ of adding extra cooling. Please correct me if I am wrong. Roger ________________________________ Message 5 _____________________________________ Time: 11:02:15 AM PST US Subject: AeroElectric-List: jumpimg gauge needles From: bob noffs i know this has come up before but i can't find it. a friend with a 912 has the needles on his falcon engine gauges jumping and twitching while engine is running. are there places to look at to fix this? he has been told to run wire from regulator to battery terminal, not just to bus. anything else come to mind? bob noffs ________________________________ Message 6 _____________________________________ Time: 11:23:22 AM PST US From: "JOHN TIPTON" Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source What's a 'fly-back' diode John ----- Original Message ----- From: "Roger & Jean" Sent: Saturday, July 20, 2013 6:55 PM Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source > > >>>Boy, that 55W light bulb sure gets warm after a few minutes. I bet a big >>>ol' heat sink and a surplus computer cooling fan would probably extend >>>bulb life. Back to the workbench! >> >> Yeah, they do. Not sure how you would heat sink >> it . . . most of the energy is radiated. But a fan >> would help. A salvaged 12v cooling fan from a computer >> should be low-cost option. The one I'm finishing up >> on the bench has 3 lamps. Let me know how the fan >> thingy works out for you. I might just do the same >> thing with this one. > > > I understood that these lamps were designed to work for many > 100's of hours without any form of cooling, other than ambient air. > If this is the case, then I do not see much advantage in going to > the > $effort$ of adding extra cooling. Please correct me if I am wrong. > > Roger > > > ________________________________ Message 7 _____________________________________ Time: 11:59:54 AM PST US Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source From: Bill That was my question John! I found this: http://en.wikipedia.org/wiki/Flyback_diode Bill On Sat, Jul 20, 2013 at 11:22 AM, JOHN TIPTON wrote: > jmtipton@btopenworld.com> > > What's a 'fly-back' diode > > John ________________________________ Message 8 _____________________________________ Time: 01:02:12 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source > I understood that these lamps were designed to work for many > 100's of hours without any form of cooling, other than ambient air. > If this is the case, then I do not see much advantage in going to the > $effort$ of adding extra cooling. Please correct me if I am wrong. Oh sure. Those are quartz-glass envelopes high temperature materials elsewhere. They're in no 'danger' for operating uncooled. Bob . . . ________________________________ Message 9 _____________________________________ Time: 01:06:03 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: jumpimg gauge needles At 01:01 PM 7/20/2013, you wrote: >i know this has come up before but i can't find it. a friend with a >912 has the needles on his falcon engine gauges jumping and >twitching while engine is running. are there places to look at to >fix this? he has been told to run wire from regulator to battery >terminal, not just to bus. anything else come to mind? > Does the jumping stop with the alternator OFF? Can you describe the architecture of his ground system? Do all the gauges wiggle or just some . . . and what do they display. Are there oil, coolant or fuel SENSORS that ground locally . . . in others words ground where they mount and then carry their data off on a single wire? Bob . . . ________________________________ Message 10 ____________________________________ Time: 02:15:44 PM PST US Subject: Re: AeroElectric-List: jumpimg gauge needles From: bob noffs bob, i know the answer to some of your questions but i will track down arnie and get answers for them all and get back to you. bob noffs On Sat, Jul 20, 2013 at 3:05 PM, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > nuckolls.bob@aeroelectric.com**> > > > At 01:01 PM 7/20/2013, you wrote: > >> i know this has come up before but i can't find it. a friend with a 912 >> has the needles on his falcon engine gauges jumping and twitching while >> engine is running. are there places to look at to fix this? he has been >> told to run wire from regulator to battery terminal, not just to bus. >> anything else come to mind? >> >> > Does the jumping stop with the alternator > OFF? > > Can you describe the architecture of his > ground system? Do all the gauges wiggle > or just some . . . and what do they display. > Are there oil, coolant or fuel SENSORS > that ground locally . . . in others words > ground where they mount and then carry their > data off on a single wire? > > > Bob . . . > > ________________________________ Message 11 ____________________________________ Time: 03:22:49 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: Battery capacity tester-was flyback diode, now clock source At 01:59 PM 7/20/2013, you wrote: >That was my question John!=C2 > >I found this: >http://en.wikipedia.org/wiki/Fl yback_diode This is a good description. See also this series of articles on 'spike suppression' on our website. http://tinyurl.com/mkcshhs Bob . . . ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.