---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 10/28/17: 10 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:09 AM - Re: Rotax/Ducati Voltage Regulator/Rectifier (Jan de Jong) 2. 03:08 AM - Re: Rotax/Ducati Voltage Regulator/Rectifier (GTH) 3. 04:29 AM - Rotax 914 TCU interface (Peter Pengilly) 4. 06:04 AM - Re: Rotax/Ducati Voltage Regulator/Rectifier (Robert L. Nuckolls, III) 5. 06:54 AM - Re: Rotax/Ducati Voltage Regulator/Rectifier (user9253) 6. 09:57 AM - Re: Re: Rotax/Ducati Voltage Regulator/Rectifier (Ken Ryan) 7. 11:48 AM - Re: Rotax/Ducati Voltage Regulator/Rectifier (user9253) 8. 01:42 PM - Re: Re: Constructing an automatic RCA video camera feed splitter (Alec Myers) 9. 05:03 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page) 10. 05:10 PM - Re: Constructing an automatic RCA video camera feed splitter (Eric Page) ________________________________ Message 1 _____________________________________ Time: 02:09:18 AM PST US Subject: Re: AeroElectric-List: Rotax/Ducati Voltage Regulator/Rectifier From: Jan de Jong I attach a pdf presuming to depict R/R principle of operation. I await (dis)agreement. I hope that will help. Jan de Jong On 10/28/2017 6:30 AM, jrevens wrote: > > Can someone on this list tell me definitively how the Rotax/Ducati regulator/rectifier as used with the 912 series engines actually works? There is so much conflicting info on the internet about it. I don't believe it is a shunt or series type, and might be a switching type regulator, but I'd like to know for sure just to educate myself. I've read so many comments from folks who state emphatically that it is this or that, but there is only one correct answer of course. Also, I know that many of the frequent failures of these units are being attributed to excess temperature by many. Now I recently read that these units actually create more heat when operating with a small electrical load on the system versus fully loaded closer to the maximum rating. Others say just the opposite. I know that there are many contributors to this forum who really know what they are talking about, and I sure would appreciate knowing the actual facts. > > In the same vein, I was wondering if Bob N. or anyone else ever fully investigated or tested the Silent Hektik unit. I was able to get one from a friend in Europe and I'm going to use it on my new Kitfox. It's a very nice looking piece. > > Thanks in advance for any information or comments relating to these questions. > > -------- > John Evens > Thorp T-18 N71JE (built & flying) > Kitfox SS7 N27JE (building) ________________________________ Message 2 _____________________________________ Time: 03:08:49 AM PST US Subject: Re: AeroElectric-List: Rotax/Ducati Voltage Regulator/Rectifier From: GTH /Le 28/10/2017 06:30, jrevens a crit : / > Also, I know that many of the frequent failures > of these units are being attributed to excess temperature by many. Now > I recently read that these units actually create more heat when > operating with a small electrical load on the system versus fully > loaded closer to the maximum rating. Others say just the opposite./ Hi John, FWIW, here is a brief article on what we found when conducting an actual lab study of the Rotax and Schicke GR4 voltage R/R during the build of our project some 14 years ago. I drew the schematics after opening a couple of failed Rotax regulators. My friend Jerome had to run some component on an industrial bench to determine their characteristics. http://contrails.free.fr/elec_ducati_en.php My buddy's students also conducted a thermal study of the regulator. Their - unpublished- 48 page report is only in French, though. Hop this helps, -- Best regards, Gilles http://contrails.free.fr http://lapierre.skunkworks.free.fr ________________________________ Message 3 _____________________________________ Time: 04:29:41 AM PST US From: "Peter Pengilly" Subject: AeroElectric-List: Rotax 914 TCU interface Does anyone have any experience with the Rotax 914 Turbo Control Unit interface app? I know the TCU has the on-board adapter and a straight RS232 interface lead will work. Where is the interface software obtained from? The TCU in question is flashing the yellow light, meaning an airbox/throttle position sensor is broken/disconnected. Apparently this app will indicate which sensor to look at. Is the software straight forward to use? Thanks in advance, Peter ________________________________ Message 4 _____________________________________ Time: 06:04:39 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Rotax/Ducati Voltage Regulator/Rectifier At 04:06 AM 10/28/2017, you wrote: >I attach a pdf presuming to depict R/R principle of operation. >I await (dis)agreement. >I hope that will help. Here's a real schematic to go with it . . . http://tinyurl.com/ybvvwy9s Bob . . . ________________________________ Message 5 _____________________________________ Time: 06:54:35 AM PST US Subject: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier From: "user9253" My RV-12 with a Rotax 912ULS came with the Ducati rectifier/regulator. The Ducati is switching type regulator. It obeys ohm's law. The more current that flows, the warmer it gets. Mike Miller is very knowledgeable about the Ducati. He has posted on VansAirforce and also on this website, if I remember right. There are different opinions about why the Ducati fails including heat, poor thermal design, and poor manufacturing practices. I and others have had success using a lawnmower regulator. Search eBay for AM101406, or MIA881279, or JDR1406. No matter what brand regulator is installed, keep it cool and mount it using heat conductive paste. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473912#473912 ________________________________ Message 6 _____________________________________ Time: 09:57:21 AM PST US From: Ken Ryan Subject: Re: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier Joe, Regarding your statement: "No matter what brand regulator is installed, keep it cool and mount it using heat conductive paste" Does that apply to the Ducati? I ask because mine does not have a metal back. The backside of mine is that potting material, and it is set back from the case by almost 1/16". The only thing making contact are the tiny ears with the mounting holes. Ken On Sat, Oct 28, 2017 at 5:53 AM, user9253 wrote: > > My RV-12 with a Rotax 912ULS came with the Ducati rectifier/regulator. > The Ducati is switching type regulator. It obeys ohm's law. The more > current that flows, the warmer it gets. Mike Miller is very knowledgeable > about the Ducati. He has posted on VansAirforce and also on this website, > if I remember right. There are different opinions about why the Ducati > fails including heat, poor thermal design, and poor manufacturing practices. > I and others have had success using a lawnmower regulator. Search eBay > for AM101406, or MIA881279, or JDR1406. No matter what brand regulator is > installed, keep it cool and mount it using heat conductive paste. > > -------- > Joe Gores > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=473912#473912 > > ________________________________ Message 7 _____________________________________ Time: 11:48:51 AM PST US Subject: AeroElectric-List: Re: Rotax/Ducati Voltage Regulator/Rectifier From: "user9253" Yeah, the small mounting contact area will not conduct much heat. But even so, every little bit helps. Use heat conductive grease. A shroud with attached blast tube will help also. You might already have thermal grease for spark plug threads. Below is a quote from Jim Weir. > go down to the drugstore and get a small tube of that white stuff you rub on your nose in the summertime (zinc oxide). It isn't the BEST thermal conductor you can find, but it will do a fine job in most instances. A wise man once said that anything will conduct heat better than air. You do not have to buy the expensive stuff containing silver. -------- Joe Gores Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473915#473915 Attachments: http://forums.matronics.com//files/reg_shroud_185.pdf ________________________________ Message 8 _____________________________________ Time: 01:42:16 PM PST US From: Alec Myers Subject: Re: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter Eric, et al. Now, I have written a first attempt at the software for this. It uses 220 instructions, 9 bytes of RAM, and two bytes of non-volatile memory. Its coded for the 16f18323, which costs about $1. All 14-pin PICs use pretty much the same pinout, as far as I can tell. Pinout as it stands is A0 - right button - momentary short to ground A1 - left button - momentary short to ground A4,5, C0-5 video selects, active low The pins can change easily, on this PIC theyre all equivalent, except I thought it best not to use A3 as thats Vpp which goes to something high for ICSP. If you want active high for the video select we can do that too, but that means we cant hack about with bit-oring the outputs, as Bob discussed. Operation: Right button short push (<1 sec): advance to next camera and stop sequencing Right button long push (>1 sec): advance to next camera and continue automatic sequencing forward Left button short push: previous camera and stop sequencing Left button long push: previous camera and automatic sequence in reverse If power is applied with the left button held down: Left button: reduce camera count by 1 Right button: increase camera count by 1 If power is applied with the right button held down: Left button: decrease sequence delay by one second (to a maximum of 1 seconds, wraps around to 16 seconds) Right button: increase sequence delay by one second (to a maximum of 16 seconds, wraps around to 1 second) If power button is applied with both buttons held down: Reset to 4 cameras, and 3 second sequence period I have to check if the EEPROM memory can be programmed along with the code. ________________________________ Message 9 _____________________________________ Time: 05:03:52 PM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Eric Page" Alec, I think my last post on this subject (on Fri 10/20) must not have been echoed out via email, as it drew no reply at the time. To sum it up, I found another, better option for the video switch IC. That was the CD4051B, but I've since found an even better one. The CD74HC4051E has high bandwidth, is a true 8:1 mux in a single IC instead of two 4-channel switches, and it requires only 3 control lines to select one of 8 inputs. http://www.ti.com/lit/ds/symlink/cd74hc4051.pdf Since just 3 control lines are used, an 8-pin PIC is all we need, so I went back to the PIC12F683. For ease of layout, the pin assignments work best like this: 1: Vdd 2: Control B 3: Control A 4: Vpp 5: Control C 6: Switch (Left) / ICSPCLK 7: Switch (Right) / ICSPDAT 8: Vss With the CD74HC4051E and PIC12F683, I was just able to make everything fit in the space of a DB-25 backshell I found on Digi-Key (not necessarily the biggest one, but the only one I could find with a drawing that shows interior dimensions)... https://www.digikey.com/product-detail/en/norcomp-inc/983-025-010R031/925PE-ND/858537 To save a bit of space, I used a two-position male pin header instead of a tactile switch for the duplicate left switch on the board. It can be closed with one of these little shorting jumpers... https://www.digikey.com/product-detail/en/sullins-connector-solutions/SPC02SYAN/S9001-ND/76375 I hope it isn't a big pain to alter the code for different PICs. I'm sorry you didn't see my earlier post -- it's the last one in this thread... http://forum.matronics.com/viewtopic.php?t=16767494 For some reason I don't understand, the Matronics server has split this discussion into more than a dozen separate threads, some with just one or two posts. I emailed Matt Dralle about it, but he must be away or busy, as he didn't reply. Bob, I presume you must have missed my post last week also. I asked about the DB-25 backshell you posted a picture of. Do you have a part number so I can get a dimensioned drawing, or do you know the interior dimensions? It looks like it might be bigger than the one I found, and a bit more room for video signal trace routing would be welcome. Cheers, Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473918#473918 ________________________________ Message 10 ____________________________________ Time: 05:10:17 PM PST US Subject: AeroElectric-List: Re: Constructing an automatic RCA video camera feed splitter From: "Eric Page" alec(at)alecmyers.com wrote: > I have to check if the EEPROM memory can be programmed along with the code. I would be surprised if it isn't. The PICAXE chips I've played around with are based on PICs, and their EEPROMs are loadable during programming. Of course, that might be a function of the PICAXE bootloader and not a native capability of the bare silicon... Eric Read this topic online here: http://forums.matronics.com/viewtopic.php?p=473919#473919 ------------------------------------------------------------------------------------- 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.