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Any ideas on two minute delayed off

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rparigoris

Joined: 24 Nov 2009
Posts: 805

Posted: Wed May 26, 2010 8:43 pm Post subject: Any ideas on two minute delayed off

Hi group.



Working on our gear warning system that needs to address needs for both powered flight and soaring flight we have designed one that does pretty good.



However we need a devise that can silence horn for approx. two minutes. In other words by switching a momentary switch, power to horn will be killed for approx. two minutes.



Needs to be able to handle 500 mA (at) 14.4 volts.



Something small and reliable like a delayed off relay, or??



Any ideas, and where to purchase would be appreciated.



Thx.

Ron Parigoris

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu May 27, 2010 5:06 am Post subject: Any ideas on two minute delayed off

At 11:43 PM 5/26/2010, you wrote:

 	  Quote: 	
		  

<rparigor(at)suffolk.lib.ny.us>



Hi group.



Working on our gear warning system that needs to address needs for 

both powered flight and soaring flight we have design one that does 

pretty good.



However we need a devise that can silence horn for approx. two 

minutes. In other words by switching a momentary switch power to 

horn will be killed for two minutes.



Needs to be able to handle 500 mA (at) 14.4 volts.



Something small and reliable like a delayed off relay, or??



Any ideas, and where to purchase would be appreciated.



Thx.

Ron Parigoris


	


   You can build such a timer from Radio Shack parts.

   What kind of 'horn' are we talking about. Solid

   state, piezo electric or an electro-mechanical

   buzzer?



   Bob . . .

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Ed Anderson

Joined: 10 Jan 2006
Posts: 475

Posted: Thu May 27, 2010 5:12 am Post subject: Any ideas on two minute delayed off

Go to Google and typing in "555 timer relay" - you will find a lot of

circuits that would give you what you want and some units and kits as well.

Here's a couple of examples



http://www.aaroncake.net/circuits/relaytim.asp



http://www.hobbytron.net/R-UT-5.html



Ed Anderson



Rv-6A N494BW Rotary Powered



Matthews, NC



eanderson(at)carolina.rr.com



http://www.andersonee.com



http://www.dmack.net/mazda/index.html



http://www.flyrotary.com/



http://members.cox.net/rogersda/rotary/configs.htm#N494BW



http://www.rotaryaviation.com/Rotorhead%20Truth.htm



--

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_________________
Ed Anderson
Rv-6A N494BW Rotary Powered
Matthews, NC
eanderson@carolina.rr.com

jonlaury

Joined: 06 Nov 2006
Posts: 336

Posted: Thu May 27, 2010 7:51 am Post subject: Re: Any ideas on two minute delayed off

I've dealt with Carl's hobbies and they are first rate for service and suppport. I had to build a timer for another project and used the one in this link. I built it from a kit (educational and fun) or you can buy it assembled. This one has a toggle feature  that seems like it would do what you want.

http://www.electronickits.com/kit/complete/elec/ck1614.htm?gclid=CNPA94rj2o4CFRcIYgodoEizAA



John

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rparigoris

Joined: 24 Nov 2009
Posts: 805

Posted: Thu May 27, 2010 9:09 am Post subject: Any ideas on two minute delayed off

Hi Bob"You can build such a timer from Radio Shack parts.  What kind of 'horn' are we talking about. Solid  state, piezo electric or an electro-mechanical  buzzer?"LOUD piezo. I was hoping to get away simple with something like an off the shelf reed switch/relay unit? Or perhaps 555 route is best?Ron Parigoris   [quote][b]

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nuckolls.bob(at)aeroelect
Guest

Posted: Thu May 27, 2010 10:35 am Post subject: Any ideas on two minute delayed off

At 12:05 PM 5/27/2010, you wrote:

 	  Quote: 	
		  Hi Bob



"You can build such a timer from Radio Shack parts.  What kind of 

'horn' are we talking about. Solid  state, piezo electric or an 

electro-mechanical  buzzer?"



LOUD piezo. I was hoping to get away simple with something like an 

off the shelf reed switch/relay unit? Or perhaps 555 route is best?


	


   Yeah, simple SHORT delays are possible with some

   rudimentary circuits using relays . . . but when

   you need LONG delays, some electronics is in order.



   Suggest:



http://aeroelectric.com/Pictures/Schematics/Piezo_Horn_Silence-Timer.pdf

   You can try an aluminum electrolytic in the time delay

   slot and see if it works well enough for you. A

   tantalum per number suggested works best but they're

   a bit pricy.



   Bob . . .

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kuffel(at)cyberport.net
Guest

Posted: Thu May 27, 2010 1:34 pm Post subject: Any ideas on two minute delayed off

The Carl's Electronics CANCK158 universal start stop timer kit has all the 

pieces you need including the relay and push button.



See:



http://www.electronickits.com/kit/complete/timers/canck158.htm



At $15.95 for the kit ($18.95 assembled) it would be hard to find a better, 

less expensive solution.  Just run your buzzer wire through the Normally 

Closed branch of the relay.



Tom Kuffel

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