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Looking for a circuit that when you press a button powe

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jskiba(at)icosa.net
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Posted: Sun Sep 15, 2013 6:53 am Post subject: Looking for a circuit that when you press a button powe

As usual Bob you are correct on all statements 



The one other item I would like to add is to also include a two speed  function.

 A slower rate of movement for the servo at a higher airspeed controlled by manual switch or airspeed switch, vs the full rate of the servo at slow airspeeds (pattern) again that portion could be store bought (ray allen speed control one example but those are $45 each so building one at the same time as the original requested circuit, I would think would be lots cheaper and I would learn something about it in the process) 



*Note I just found your drawing for two speed trim system but cannot find the Component "AEC9013-110-1 Speed Control" on your site any longer. Ref: http://www.aeroelectric.com/PPS/Flight/Trim/Two_Speed_Trim_2.pdf

Does this drawing show everything to build the speed controller ?



Sorry for wasting $time$ that can be expended when the

   participants in a discussion all have different

   mental images of what's being asked . . .



Thanks in advance for everyone's time 

Jeff.




--> <nuckolls.bob(at)aeroelectric.com>



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

 	  Quote: 	
		  

--> <jskiba(at)icosa.net>



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 . . .

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kuffel(at)cyberport.net
Guest

Posted: Sun Sep 15, 2013 7:27 am Post subject: Looking for a circuit that when you press a button powe

Jeff,



<<  The one other item I would like to add is to also include a two speed 

function.  >>



The circuit I published (June 2013 Kitplanes magazine) does that also.  All 

out full featured parts cost is $30 about 1/10th the TCW unit..



Tom Kuffel

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