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
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| Subject: | Re: 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 <nuckolls.bob@aeroelec
tric.com> 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
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| Subject: | Re: The Benefits of Maplestory 2 Critical Rate |
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
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| Subject: | Re: 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
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| Subject: | Re: 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
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| Subject: | Re: 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 <ceengla
nd7@gmail.com> 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
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| Subject: | 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
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| Subject: | Re: 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
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| Subject: | Re: 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 . . .
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