---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 02/17/19: 8 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 12:31 AM - Re: PTT, snap action or not? (John Tipton) 2. 02:46 AM - Re: The Benefits of Maplestory 2 Critical Rate (donjohnston) 3. 05:02 AM - Re: PTT, snap action or not? (Robert L. Nuckolls, III) 4. 05:41 AM - Re: PTT, snap action or not? (Art Zemon) 5. 06:45 AM - Re: MAC 3 LED Trim Indicator... (chaskuss@yahoo.com) 6. 07:14 AM - Alternator Filters (Robert L. Nuckolls, III) 7. 07:19 AM - Re: PTT, snap action or not? (Robert L. Nuckolls, III) 8. 05:48 PM - Re: PTT, snap action or not? (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 12:31:37 AM PST US From: John Tipton Subject: Re: AeroElectric-List: PTT, snap action or not? Are the ones with the =98snap=99 action, the ones that would som etimes stick closed, I wonder ? John Sent from my iPad ----x--O--x---- > On 17 Feb 2019, at 1:09 am, Robert L. Nuckolls, III wrote: > > At 05:41 AM 2/14/2019, you wrote: >> Thank you Bob and Charlie. The AeroElectric list never fails to deliver. >> >> So, it sounds like a PTT switch that clicks when pushed (snap action) or n ot really doesn't matter. I didn't think it did, but I wondered if one was p referred over another.=C3=82 >> >> My current button on the (throw over) yoke (Debonair) does not, but the c opilot side on the panel does. I think I prefer the click. >> >> Regards, >> Jim > > really small tactile feedback, panel > mount push buttons are not common > catalog items. That one I showed you > mounts in a 1/2" hole and probably > wouldn't fit in a classic horn grip. > > This button has been around since I > can remember . . . these were optional > on the control horns on Cessnas and > tied them into the PTT system via a > drooping coil cord under the yolk. > > https://tinyurl.com/y2neb9nf > > Very small and easy to mount. > > Bob . . . ________________________________ Message 2 _____________________________________ Time: 02:46:34 AM PST US Subject: AeroElectric-List: Re: The Benefits of Maplestory 2 Critical Rate From: "donjohnston" ceengland7(at)gmail.com wrote: > I submit that Matt does such an incredible job filtering spam, that when a single email slips through, we feel violated. Agreed. It does seem like the volume has increased lately. I wonder if these messages are sent through the email gateway or are posted directly using the forum interface? Read this topic online here: http://forums.matronics.com/viewtopic.php?p=487652#487652 ________________________________ Message 3 _____________________________________ Time: 05:02:57 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: PTT, snap action or not? At 02:15 AM 2/17/2019, you wrote: >Are the ones with the =98snap=99 action, the >ones that would sometimes stick closed, I wonder ? > >John Good question . . . and it depends on the mechanism along with the antagonizing circumstance. Larger switches can have some spring loaded monkey-motion as part of the operating mechanism. Parts that are certainly at-risk for wear or failure. But in the realm of tiny switches, the most common mechanism is a domed, 'click' disk not unlike this: http://www.freepatentsonline.com/6596954.pdf Widely used in all manner of membrane protected keypads and eteched circuit board mounted push buttons. https://tinyurl.com/yxqv237s This class of switch is unlikely to stick mechanically . . . more likely to fail-to-close electrically due to wear-out. Some push buttons are adaptations of their panel-mounted, toggle switch cousins. Here's a rather small example that mounts in a 1/4 inch hole. https://tinyurl.com/y3lqn5ul This style might fail mechanically in a closed condition. It could also fall victim to contamination of the clearance between button and mounting barrel. Here's a pretty 'busy' push-button design that probably has a nice tactile feedback . . . but it's big . . . mounts in a 1/2" hole. https://tinyurl.com/y3k6p4gn Emacs! This design might have a mechanical failure mode that manifests in a stuck closed condition, I think any switch based on snap-disk mechanism would be relatively free of stick-shut failure modes. Same for mechanisms that simply butt the contacts together upon actuation. All others are kind of a toss-up. Bob . . . ________________________________ Message 4 _____________________________________ Time: 05:41:07 AM PST US From: Art Zemon Subject: Re: AeroElectric-List: PTT, snap action or not? Bob, I have followed a couple of your links to the corresponding switches on Digikey's website. Once there, I don't see any indication that the switches have a snap-action. Were I shopping for such a switch, how would I find them? Or is the only way to ask someone like you, who has the knowledge in his head? -- Art Z. -- https://CheerfulCurmudgeon.com/ *"Be kind, for everyone you meet is fighting a hard battle."* ________________________________ Message 5 _____________________________________ Time: 06:45:59 AM PST US From: chaskuss@yahoo.com Subject: Re: AeroElectric-List: MAC 3 LED Trim Indicator... Matt, why not supply us with a close up photo or two? Often, the LED polar ity can be identified by a difference in the legs of the LED. If the leads are to short to extend, could you de-solder them [one at a time] from the b oard and solder in new leads? Charlie On Sunday, February 17, 2019, 1:15:39 AM UTC, Charlie England wrote: On 2/16/2019 6:27 PM, Matt Dralle wrote: Hello, A fellow homebuilder friend of mine has a old-style three-LED (Red|Green|R ed) MAC Trim Position Indicator.=C2- The Green LED was burned out, and th e wires were cut off too short. I told him I would try to replace the LED and lead wires.=C2- I got it a part without completely destroying it.=C2- But the internal wiring and po larity of the LEDs isn't that clear to me, nor is the actuation of it throu gh a servo electronically. I'm not sure how to activate three LEDs with onl y three wires? (Or did there used to be four wires?) Does anyone have a PDF schematic of the 3-LED MAC Trim Indicator that you could email to me? Or better yet, does anyone have a spare or unused one of these they would like to sell me? Thank you, Matt Dralle Is it accessible enough to clip-lead the LED in for testing? If so, just p ick a direction. If it works, you're done. If it doesn't, reverse the leads . Assuming that the current limiting is done external to the LED itself, it won't matter if you insert it backward; it just won't light up. Charlie | | Virus-free. www.avast.com | ________________________________ Message 6 _____________________________________ Time: 07:14:24 AM PST US From: "Robert L. Nuckolls, III" Subject: AeroElectric-List: Alternator Filters A few days ago there was a thread concerning add-on filter devices to various places on the engine driven power sources. An AvWeb article was cited as a reference on the topic. Unfortunately, the article cited was not well grounded in physics or practice. I spent a little time on the keyboard ironing out some of the 'lumpier' ideas: https://tinyurl.com/yxqx2gab Bob . . . ________________________________ Message 7 _____________________________________ Time: 07:19:20 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: PTT, snap action or not? At 07:39 AM 2/17/2019, you wrote: >Bob, > >I have followed a couple of your links to the corresponding switches >on Digikey's website. Once there, I don't see any indication that >the switches have a snap-action. Were I shopping for such a switch, >how would I find them? Or is the only way to ask someone like you, >who has the knowledge in his head? yeeeaahh . . . probably. You kinda "know" based on the switch's envelope and pedigree. I.e. some of those push buttons evolved from the toggle switch world. You can comb though the data sheets offered on EVERY DigiKey offering. They will often describe operating forces, pre-travel and over-travel numbers that allude to if not define a snap-action device. But that's what the List is for . . . got a likely candidate? Post it to the list and let's talk about it. Bob . . . ________________________________ Message 8 _____________________________________ Time: 05:48:06 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: PTT, snap action or not? At 07:39 AM 2/17/2019, you wrote: >Bob, > >I have followed a couple of your links to the corresponding switches >on Digikey's website. Once there, I don't see any indication that >the switches have a snap-action. Were I shopping for such a switch, >how would I find them? Or is the only way to ask someone like you, >who has the knowledge in his head? Did a little poking around in the DigiKey catalog. I think this push button is the smallest device you can get with any probability of having some tactile feedback. Seems you can get colored caps to go on the actuator. https://tinyurl.com/y4wbsgoe https://tinyurl.com/y4mguheq There's a version with a smaller mounting barrel but the body size behind the panel is unchanged. I'd stay with the 1/4-40 threaded part. In any case, the price is certainly right. 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.