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PTT, snap action or not?

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jhausch

Joined: 14 Jan 2008
Posts: 35

Posted: Wed Feb 13, 2019 6:40 pm Post subject: PTT, snap action or not?

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

nuckolls.bob(at)aeroelect
Guest

Posted: Wed Feb 13, 2019 7:17 pm Post subject: PTT, snap action or not?

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
Guest

Posted: Wed Feb 13, 2019 7:28 pm Post subject: PTT, snap action or not?

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

Posted: Thu Feb 14, 2019 3:42 am Post subject: PTT, snap action or not?

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

nuckolls.bob(at)aeroelect
Guest

Posted: Sat Feb 16, 2019 5:10 pm Post subject: PTT, snap action or not?

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 . . .

John M Tipton

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

Posted: Sun Feb 17, 2019 12:31 am Post subject: PTT, snap action or not?

Are the ones with the â€˜snapâ€™ 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.Ã‚ 



 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 . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 17, 2019 5:02 am Post subject: PTT, snap action or not?

At 02:15 AM 2/17/2019, you wrote:

  	  Quote: 	
		  Are the ones with the â€˜snapâ€™ 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
Guest

Posted: Sun Feb 17, 2019 5:41 am Post subject: 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?

Â  Â  -- Art Z.



-- 

https://CheerfulCurmudgeon.com/"Be kind, for everyone you meet is fighting a hard battle."

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nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 17, 2019 7:19 am Post subject: PTT, snap action or not?

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 . . .

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Feb 17, 2019 5:48 pm Post subject: PTT, snap action or not?

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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