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

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nuckollsr(at)cox.net
Guest

Posted: Thu May 10, 2007 6:13 am Post subject: SPDT momentary push-button switch (comm flip-flop)

At 09:34 PM 5/9/2007 -0500, you wrote:



 	  Quote: 	
		  I plan to install a comm flip-flop pushbutton switch in a wood grip from 

Custom Aircraft Grips in Kelso, WA. I have a King KX 155 nav/comm which 

requires a SPDT momentary switch for this feature vs. the SPST switch that 

was supplied with the grip. The bore diameter in the grip for the switch 

is 11/32 . I appreciate any leads that are provided regarding a source for 

this switch. Thanks.


	


  Are there actually three wires that are connected to

  this switch? It's unusual to need more than a momentary

  connection (usually ground) to a single flip-flop signal

  lead. While there might be SPDT ON-(ON) switches described/

  recommended for this application, I would be surprised that

  a SPST OFF-(ON) switch would not be adequate to the task.

  Bob . . .



        ----------------------------------------

        ( IF one aspires to be "world class",  )

        ( what ever you do must be exercised   )

        ( EVERY day . . .                      )

        (                  R. L. Nuckolls III  )

        ----------------------------------------

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wgill10(at)comcast.net
Guest

Posted: Thu May 10, 2007 6:51 am Post subject: SPDT momentary push-button switch (comm flip-flop)

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.



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

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rjquillin(at)gmail.com
Guest

Posted: Fri May 11, 2007 7:06 am Post subject: SPDT momentary push-button switch (comm flip-flop)

At 22:09 5/10/2007, you wrote:

 	  Quote: 	
		  Aha! good data sir. How big are the resistors and to

    what voltage do they pull up? The snipit from the

    install manual suggests that pulling to ground is

    the expected resting condition with the lead being

    pulled up to +14 to effect a "flip".


	


I need to point out, my manual is for the 155A, not a 155 as Bill has.

My post was 'in case' the "A" had been inadvertently omitted from the model.

Bill also clearly states, if I read correctly, his IM details 

connections to both +14 and ground; presumably in addition to the 

input pin on the radio.



I'd like to see the IM page if possible...



For the 155A from the SM;

External input pin through 221 ohm resistor and diode in series to 

the base of a PNP (with internal series base and emitter-base 

resistors shown).  Emitter hard +5,  Collector pulled to ground via 

47.5k and output to guts via 4.75k.

The input is protected by a 40V zener and debounce by a 330pF to 

ground between the resistor and diode.



The 155A IM clearly shows N.O. momentary to ground to effect transfer.



Base pulled low, xstr turns on and supplies +5 via 4.75 to guts.



Bob, pdf to you directly to save BW.

Bill, let me know if you are interested too...



Ron Q.

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