---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Mon 10/10/22: 5 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 07:12 AM - Re: Time delay on relay needed (user9253) 2. 07:36 AM - Re: Time delay on relay needed (Robert L. Nuckolls, III) 3. 12:17 PM - Re: Integration of Rotax 912iS (Eric Page) 4. 12:25 PM - Re: Time delay on relay needed (rparigoris) 5. 04:59 PM - Dual Battery Setup (Robert Schmid) ________________________________ Message 1 _____________________________________ Time: 07:12:00 AM PST US Subject: AeroElectric-List: Re: Time delay on relay needed From: "user9253" Do a Google search for "capacitor time delay circuit". One of the results of my search turned up this one with a delay of 1.5 seconds. https://www.arrow.com/en/research-and-events/articles/make-a-simple-capacitor-transistor-timing-circuit -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=508045#508045 ________________________________ Message 2 _____________________________________ Time: 07:36:29 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Time delay on relay needed At 11:47 PM 10/9/2022, you wrote: > >Hi Group >I am working on a project where an Arduino is completely unhappy if >a 12 volt buzzer is connected to it's 10 amp relay. What kind of 'buzzer'? A legacy electro-mechanical device like we used to build in Cub Scouts? Bob . . . Un impeachable logic: George Carlin asked, "If black boxes survive crashes, why don't they make the whole airplane out of that stuff?" ________________________________ Message 3 _____________________________________ Time: 12:17:02 PM PST US Subject: AeroElectric-List: Re: Integration of Rotax 912iS From: "Eric Page" Reviving this thread from a year ago: http://forum.matronics.com/viewtopic.php?t=16777418 I've fleshed out my electrical system architecture diagram and would appreciate another round of checks by the group. Changes since my simplified diagram was posted last year: - Renamed Main Bus to Airframe Bus. - Eliminated the complicated module to switch power to the Airframe Bus, in favor of a simple relay-and-switch arrangement. - Added an Endurance Bus with dual feed paths. - Added an Overvoltage Protection Module in the path from the Rotax Fuse Box X3 Pin 3 to the Battery Bus. - Developed wiring diagrams for the Airframe and Endurance Buses. In addition to any problems you find, I have two specific questions: 1. The Rotax 912iS Installation Manual specifies 30A fuses at the Battery Bus, for the 12AWG wires to the Backup Battery Switch and the Fuse Box X3 Pin 3. Can/should 16AWG fusible links be used instead? 2. Is my use of fusible links acceptable for the Endurance & Airframe Bus feeders at the Battery Bus and the hot side of the Battery Contactor? Related links: Previous simplified diagram: http://forum.matronics.com/download.php?id=48574 Rotax 912iS wiring diagram: http://forum.matronics.com/download.php?id=48575 LTC1696 data sheet: https://www.analog.com/media/en/technical-documentation/data-sheets/1696fb.pdf Thanks! Read this topic online here: http://forums.matronics.com/viewtopic.php?p=508051#508051 Attachments: http://forums.matronics.com//files/overvoltage_protection_relay_module_rev_b_221.pdf http://forums.matronics.com//files/electrical_architecture__kitfox_5__rotax_912is_171.pdf ________________________________ Message 4 _____________________________________ Time: 12:25:07 PM PST US Subject: AeroElectric-List: Re: Time delay on relay needed From: "rparigoris" Hi Joe Thank you for reply. Bob: The Buzzer is an electro mechanical: https://www.amazon.com/gp/product/B000XBJ3AE/ref=ppx_yo_dt_b_search_asin_title?ie=UTF8&psc=1 The Arduino is powered by a 12 volt battery going through a converter to make 5 volts for the Arduino. The buzzer is using the 12 volts to operate. We put it on a scope today and saw perturbations of the 5 volts peak to peak of between 10 and 12 volts. We added transorbs and .1 mF ceramic capacitors across the two parallel buzzers and also a .1 mF ceramic capacitor just before the DC to DC converter. Got peak to peak down to 5 to 6 volts. So far it seems to be working OK. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=508052#508052 ________________________________ Message 5 _____________________________________ Time: 04:59:15 PM PST US From: Robert Schmid Subject: AeroElectric-List: Dual Battery Setup I am new to this list, but was told to come here for advice on my electrical design for a fuel injected, electronic ignition single engine plane. I have looked at AeroElectric design recommendations but wanted to hear feedback on the following changes ... - Have 2 identical, redundant, in parallel batteries instead of one full and one backup ... I need to weight anyhow - Have 2 identical, redundant, in parallel high pressure fuel pumps - I run an electronic circuit breaker system called VP-X for all components except ignition coils and injectors per SDS EFI manufacturer recommendation - With the VPX, I can switch all components individually in my EFIS, measure amp usage and I have therefore very few switches on the panel My engine start procedure is designed as follows ... - MAIN on - FUEL PUMP(S) on - Fuel pressure CHECK - Starting engine - Oil pressure CHECK My runup procedure is designed as follows ... - Battery CHECK for 1, 2, both by using DPDT battery switch ... leave on both for takeoff, 1 or 2 in cruise - Fuel pumps CHECK for 1, 2, both by using DPDT fuel pump switch ... leave on both for takeoff, 1 or 2 in cruise - Coils CHECK for 1, 2, both by pulling push button circuit breakers ... leave on both for entire flight Duckie Wiring.pdf I have attached my electrical drawing, a draft so be gentle =F0=9F=98=89. P lease take a look but focus on my battery setup as it's different from Bob's design. Thanks Robert [image: photo] *Robert Schmid* +1 (408) 805-5450 <+1+(408)+805-5450> | robert@theschmids.org theschmids.org "Age is something that doesn't matter, unless you are a cheese." - Luis Bunuel. ------------------------------------------------------------------------------------- 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.