---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Tue 07/21/20: 6 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 08:20 AM - Re: best practices for Molex? (Robert L. Nuckolls, III) 2. 09:08 AM - Re: best practices for Molex? (Kent or Jackie Ashton) 3. 10:04 AM - Re: best practices for Molex? (Charlie England) 4. 11:34 AM - Re: TypeS Lithium Jump starter (rparigoris) 5. 08:13 PM - Re: Re: TypeS Lithium Jump starter (Robert L. Nuckolls, III) 6. 08:40 PM - Re: best practices for Molex? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 08:20:39 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: best practices for Molex? > I've seen come 'conventions' but they tend to > be institutional . . . In the dozens of 'design to specs' products I've worked, I don't recall any specification dictating gender of the pins EXCEPT where the device was form, fit and function for an existing device. Virtually all customers had a preference for the style of connector but the pin out gender was left open. Most connectors are relatively 'scoop proof' these days as illustrated by this combination of pins and housing . . . Bob . . . ________________________________ Message 2 _____________________________________ Time: 09:08:38 AM PST US From: Kent or Jackie Ashton Subject: Re: AeroElectric-List: best practices for Molex? Heres a good discussion of Molex connectors http://tech.mattmillman.com/info/crimpconnectors/ -Kent > On Jul 20, 2020, at 12:54 PM, prestonkavanagh wrote: > > > I'm wiring one of my first connectors, a 4-wire molex from wingtip light back to the wiring conduit and ultimately a faston tab on a panel switch. Is there a standard for which side is male and which female? > > The radios tend to come with female plugs, so I thought to extend that: everything that points either to center line or the panel is male. But is there a standard practice? And is there a FAQ on best practices? Did I miss the relevant section in the book? Thanks for the ongoing help - I'll be paying it forward! > > -------- > PBK3 > PA-12, BD-4, RV6a, gliders > > > > > Read this topic online here: > > http://forums.matronics.com/viewtopic.php?p=497374#497374 > > > > > > > > > ________________________________ Message 3 _____________________________________ Time: 10:04:32 AM PST US From: Charlie England Subject: Re: AeroElectric-List: best practices for Molex? I *try* to keep power supply terminals female if possible. Murphy seems to hang around my shop too much and even with the shroud around the pins on Dsub connectors, I can find a way to drop one perfectly vertical on a bolt head, etc, and find the power pin in a 37 pin connector. To answer a question you didn't ask...Would I use a typical Molex if there were any other option? No. Emphatically, NO. I know that a lot of mfgrs use them and a lot of people have good results with them, but I've seen countless examples in industrial equipment go intermittent or fail due to corrosion on the mating surfaces, likely due to vibration. I've had less than stellar service from them in a/c, too, with really poor performance from the small ones used for signal wires. My go-to connector for about 90% of stuff in the a/c is the subD. Anything under about 7A (with the machined pins), and I'll go higher by ballasting a pair of pins on occasion. Gold plated so no corrosion issues like Molex, and can be much more compact for 2 pin stuff by just using the pins/sockets/heat shrink with no shell as detailed in the AEC book. FWIW... Charlie On Tue, Jul 21, 2020 at 11:17 AM Kent or Jackie Ashton wrote: > kjashton@vnet.net> > > Here=99s a good discussion of Molex connectors > http://tech.mattmillman.com/info/crimpconnectors/ > > -Kent > > > On Jul 20, 2020, at 12:54 PM, prestonkavanagh < > preston.kavanagh@gmail.com> wrote: > > > preston.kavanagh@gmail.com> > > > > I'm wiring one of my first connectors, a 4-wire molex from wingtip ligh t > back to the wiring conduit and ultimately a faston tab on a panel switch. > Is there a standard for which side is male and which female? > > > > The radios tend to come with female plugs, so I thought to extend that: > everything that points either to center line or the panel is male. But i s > there a standard practice? And is there a FAQ on best practices? Did I > miss the relevant section in the book? Thanks for the ongoing help - I'l l > be paying it forward! > > > > -------- > > PBK3 > > PA-12, BD-4, RV6a, gliders > > > > > > > > > > Read this topic online here: > > > > http://forums.matronics.com/viewtopic.php?p=497374#497374 > > > > > > > > > > > > > > > > > > > > =========== =========== =========== =========== =========== > > ________________________________ Message 4 _____________________________________ Time: 11:34:56 AM PST US Subject: AeroElectric-List: Re: TypeS Lithium Jump starter From: "rparigoris" Hi Group A note on jump starter packs. I purchased a 4,000amp 12 volt jump starter a while back. I was working on a project and needed 1,500 watts for 15 seconds (a little less than 140 amps) and not go below 10.9 volts. Although after speaking with mfg. they did indeed test and saw 4,000 amps, it was for some nanosecond at some way low voltage. Here's the real poop: it could hardly hold up 35 amps for 15 seconds! https://www.northerntool.com/shop/tools/product_200676383_200676383 Their# is 216-464-8131 Their 4,000 amp unit can put out ~ 40 amps for 3 seconds at minimum of 10.9 volts, after 15 seconds down to ~35 amps and if it were cold probably 20 or 25 amps. The battery is only 8aH. Ron P. Read this topic online here: http://forums.matronics.com/viewtopic.php?p=497389#497389 ________________________________ Message 5 _____________________________________ Time: 08:13:18 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: TypeS Lithium Jump starter At 01:31 PM 7/21/2020, you wrote: > >Hi Group >A note on jump starter packs. I purchased a 4,000amp 12 volt jump >starter a while back. I was working on a project and needed 1,500 >watts for 15 seconds (a little less than 140 amps) and not go below >10.9 volts. Although after speaking with mfg. they did indeed test >and saw 4,000 amps, it was for some nanosecond at some way low >voltage. Here's the real poop: it could hardly hold up 35 amps for 15 seconds! >https://www.northerntool.com/shop/tools/product_200676383_200676383 Yeah, there's been a host of similar products with similar track records. Some of you may remember the sensational Bolder Technologies, thin metal film jelly-roll cells that caused a big stir about 22 years ago: https://tinyurl.com/yyw6a6j6 https://tinyurl.com/y42v9ztj https://tinyurl.com/mu8oe6c We had a sample array of cells in a 12v configuration test at B&C about a year or so earlier. Yup, those 2 A.h. cells would dump current at over 400A when loaded down to 9v! They had a boat load of manufacturing process problems to solve and never quite made it. I think the company has been sold several times and presently languishes in India? But just because a cell is small does not necessarily mean it's not up to the stated task. Take the EarthX product I published test data on a few days ago. After 6+ years the battery still stores 10+ a.h. of energy. When loaded to 9v this morning, it still offered respectable 400+ amps of cranking current. The cell's robustness is exceedingly sensitive to production and design variables. The smaller the cell, the greater the sensitivity. EarthX appears to have their ducks marching along in good order. But as Ron has illustrated, not everyone is so talented. Bob . . . ________________________________ Message 6 _____________________________________ Time: 08:40:53 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: best practices for Molex? At 12:01 PM 7/21/2020, you wrote: >=C2 I *try* to keep power supply terminals female >if possible. Murphy seems to hang around my shop >too much and even with the shroud around=C2 >the=C2 pins on Dsub=C2 connectors, I can find a way >to drop one perfectly vertical on a bolt head, >etc, and find the power pin in a 37 pin connector.=C2 =C2 > >To answer a question you didn't ask...Would I >use a typical Molex if there were any other >option? No. Emphatically, NO. I know that a lot >of mfgrs use them and a lot of people have good >results with them, but I've seen countless >examples in industrial equipment go intermittent >or fail due to corrosion on the mating surfaces, >likely due to vibration. I've had less than >stellar service from them in a/c, too, with >really poor performance from the small ones used >for signal wires. My go-to connector for about >90% of stuff in the a/c is the subD. Anything >under about 7A (with the machined pins), and >I'll go higher by ballasting a pair of pins on >occasion. Gold plated so no corrosion issues >like Molex, and can be much more compact for 2 >pin stuff by just using the pins/sockets/heat >shrink with no shell as detailed in the AEC book. > >FWIW... > >Charlie Agreed. Paralleling ballasted pins was employed on the Beech Horizon's DC power distribution system. I first used them on a power distribution controller in the GQM-163 SSST prototype https://tinyurl.com/yxwsd5p9 https://tinyurl.com/8x5rssq https://tinyurl.com/6myc494 When considering a new connector requirement, my first thought is to figure out why a d-Sub WONT work. 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