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SPDT momentary push-button switch (comm flip-flop)

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rjquillin(at)gmail.com
Guest

Posted: Thu May 10, 2007 7:48 am Post subject: SPDT momentary push-button switch (comm flip-flop)

At 07:50 5/10/2007, you wrote:

 	  Quote: 	
		  I did touching the wire to ground and the frequency toggled ONCE. It was

necessary to then touch this wire to aircraft power to get it to toggle

a second time.



Bill


	


I don't have the 155 service/installation manual, but looking at the 

SM for the 155A there are some internal pull-up provisions for the 

external switch.

A momentary to ground should be all that is required.

By means of whatever type switch you choose to use.



Perhaps there is some issue within your 155?



Ron Q.

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wgill10(at)comcast.net
Guest

Posted: Thu May 10, 2007 9:33 am Post subject: SPDT momentary push-button switch (comm flip-flop)

Ron,



The 155 is fine...the install manual calls for a SPDT switch with

connections to ground AND aircraft power. 



Bill



--

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nuckollsr(at)cox.net
Guest

Posted: Thu May 10, 2007 7:59 pm Post subject: SPDT momentary push-button switch (comm flip-flop)

At 09:50 AM 5/10/2007 -0500, you wrote:



 	  Quote: 	
		  



Bob,



SPDT is correct per the installation manual (previously sent to you a

few months ago). If I had known earlier, I wouldn't have made this

provision when I ordered the grip.


	


   Oh yeah, thanks for reminding me.

 	  Quote: 	
		  I did touching the wire to ground and the frequency toggled ONCE. It was

necessary to then touch this wire to aircraft power to get it to toggle

a second time.


	


  Okay, take a peek at:



http://www.aeroelectric.com/Pictures/Schematics/KX-155_Flip-Flop_Alternative.jpg



  I think you can fool the radio into believing that there's a

  SPDT on-(on) switch in your stick grip. Wire the SPST n.o. push

  button as shown in the lower half of the drawing. This switch will

  apply the expected 14v when the button is pushed just as required

  in the upper half of the drawing. When the switch is open, the

  resistor pulls the line to ground with probably enough Umph to

  make the radio believe that its a real, double-throw switch.



  See if this works and get back to us.



  Bob . . .

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