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PTT, snap action or not?

 
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jhausch



Joined: 14 Jan 2008
Posts: 35

PostPosted: Wed Feb 13, 2019 6:40 pm    Post subject: PTT, snap action or not? Reply with quote

I tried searching
PTT AND snap AND action
No results
PTT and snap
No results
snap AND action
Some results, but none for PTT

So....

Is there a best practice or pro/con related to snap action switches for the PTT function?

Regards, Jim


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nuckolls.bob(at)aeroelect
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PostPosted: Wed Feb 13, 2019 7:17 pm    Post subject: PTT, snap action or not? Reply with quote

At 08:40 PM 2/13/2019, you wrote:
Quote:
--> AeroElectric-List message posted by: "jhausch" <jimhausch(at)gmail.com>

I tried searching
PTT AND snap AND action
No results
PTT and snap
No results
snap AND action
Some results, but none for PTT

So....

Is there a best practice or pro/con related to snap action switches for the PTT function?

Here is a likely candidate:

https://tinyurl.com/y3g6jwlw

[img]cid:7.1.0.9.0.20190213211121.0597fb88(at)aeroelectric.com.0[/img]




Bob . . .


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ceengland7(at)gmail.com
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PostPosted: Wed Feb 13, 2019 7:28 pm    Post subject: PTT, snap action or not? Reply with quote

On 2/13/2019 8:40 PM, jhausch wrote:
Quote:


I tried searching
PTT AND snap AND action
No results
PTT and snap
No results
snap AND action
Some results, but none for PTT

So....

Is there a best practice or pro/con related to snap action switches for the PTT function?

Regards, Jim

All you need is a momentary, normally open switch. (Snap or not is

usually a description for a toggle switch like a home light switch, that
stays in the position selected.) The switch takes the PTT line to
ground, the radio detects it and goes into transmit mode. Current
requirements are almost non-existent, so you can pick just about
anything that suits your fancy.

Charlie

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jhausch



Joined: 14 Jan 2008
Posts: 35

PostPosted: Thu Feb 14, 2019 3:42 am    Post subject: PTT, snap action or not? Reply with quote

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 not really doesn't matter. I didn't think it did, but I wondered if one was preferred over another. 
My current button on the (throw over) yoke (Debonair) does not, but the copilot side on the panel does. I think I prefer the click.
Regards,
Jim


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nuckolls.bob(at)aeroelect
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PostPosted: Sat Feb 16, 2019 5:10 pm    Post subject: PTT, snap action or not? Reply with quote

At 05:41 AM 2/14/2019, you wrote:
Quote:
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 not really doesn't matter. I didn't think it did, but I wondered if one was preferred over another.Â

My current button on the (throw over) yoke (Debonair) does not, but the copilot 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 . . .


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John M Tipton



Joined: 07 Aug 2018
Posts: 45
Location: Devon - England

PostPosted: Sun Feb 17, 2019 12:31 am    Post subject: PTT, snap action or not? Reply with quote

Are the ones with the ‘snap’ action, the ones that would sometimes 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(at)aeroelectric.com (nuckolls.bob(at)aeroelectric.com)> wrote:
Quote:
At 05:41 AM 2/14/2019, you wrote:
Quote:
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 not really doesn't matter. I didn't think it did, but I wondered if one was preferred over another.Â

My current button on the (throw over) yoke (Debonair) does not, but the copilot 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 . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Feb 17, 2019 5:02 am    Post subject: PTT, snap action or not? Reply with quote

At 02:15 AM 2/17/2019, you wrote:
Quote:
Are the ones with the ‘snap’ 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

[img]cid:.0[/img]

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 . . .


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art(at)zemon.name
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PostPosted: Sun Feb 17, 2019 5:41 am    Post subject: PTT, snap action or not? Reply with quote

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."


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Feb 17, 2019 7:19 am    Post subject: PTT, snap action or not? Reply with quote

At 07:39 AM 2/17/2019, you wrote:
Quote:
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 . . .


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nuckolls.bob(at)aeroelect
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PostPosted: Sun Feb 17, 2019 5:48 pm    Post subject: PTT, snap action or not? Reply with quote

At 07:39 AM 2/17/2019, you wrote:
Quote:
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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