Matronics Email Lists :: View topic - Looking for a circuit that when you press a button power

Matronics Email Lists
Web Forum Interface to the Matronics Email Lists

Get Email Distribution Too! FAQ Search Memberlist Usergroups Register

Profile Log in to check your private messages Log in

Looking for a circuit that when you press a button power

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

nuckolls.bob(at)aeroelect
Guest

Posted: Sun Sep 15, 2013 5:45 am Post subject: Looking for a circuit that when you press a button power

At 03:01 PM 9/14/2013, you wrote:

 	  Quote: 	
		  



Driving a servo max current would be 900  milliamps.

.a circuit that will only be on for 3 seconds maximum, even if 

you're still holding down the button. If you let go early, it turns 

off early. Do I have that right?  You GOT it


	


   Okay, this conversation is an excellent example

   of the $time$ that can be expended when the

   participants in a discussion all have different

   mental images of what's being asked . . .



   If I understand your design goals correctly

   you're wanting a trim motor run time limiter

   that will trip for any motor command exceeding

   3 seconds . . . but resets as soon as power

   is removed. Hence, a series of trim commands

   of 3 seconds or less will be conducted to

   the motor without modification. A stick trim

   switch would, therefore be limited in how far

   the airplane could be driven out of trim

   by the fault.



   Do I presume correctly from the current draw

   value that we're talking about a Ray-Allen

   actuator?  If so, then the motor to be controlled

   is a permanent magnet device wherein direction

   is determined by the polarity of applied voltage.

   This fact does not preclude putting the run-limit

   circuitry in the ground side of the supply power.



   This narration also suggests that the timing

   function need not be terribly accurate. A

   specification of 3.0 +/- 0.5 seconds would

   probably suffice . . . timer accuracy requirements

   drive selection of components.



   Is the narrative above accurate? The creative

   designers need to know before serious sifting

   of the ingredients suited to a recipe for

   success.



   Bob . . .

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Mike Welch

Joined: 13 Feb 2011
Posts: 272

Posted: Sun Sep 15, 2013 6:57 am Post subject: Looking for a circuit that when you press a button power

Bob N,



  Didn't you already do this circuit for me two years ago, for that IvoProp electric Prop controller?



Mike Welch

- The Matronics AeroElectric-List Email Forum -

Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:

http://www.matronics.com/Navigator?AeroElectric-List

Display posts from previous:

	Matronics Email Lists Forum Index -> AeroElectric-List	All times are GMT - 8 Hours
Page 1 of 1

Jump to:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum