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mdnanwelch7(at)hotmail.co
Guest

Posted: Wed May 12, 2010 4:16 pm Post subject: Dynon D10A audio alarm output signal

Group,

  

   While searching Dynon's archives I found the following correspondence from a guy that wanted to do exactly the same thing as me......set the audio alert signal to ALSO activate a line of LEDs.

   In addition to the audio tone that the D10A emits, I want it to also power a "555 timer/decade counter---LED strobe circuit" that I built.

   The circuit is built,  now I just need to know a good way to send a power source to it from th D10A's alarm signal.

   Evidently, according to Dynon support, I can choose between a steady tone, or an increasing rate intermittant tone, increasing in frequency the closer one gets to critical AOA.

   I believe my decade counter circuit needs a solid 5-15volts, so I'd choose the steady tone.

  

   The following is the archived messages; 



 QUESTION:

I am interested in connecting the AOA audio on my D10A to a device that would be audible or visible in the cabin of the RV-6. I assume the audio output is a modulated signal. Is there an easy way to convert this output to DC voltage that would drive a beeper/buzzer/warning light/whatever?

______________________________________________________________________________

ANSWER;  (from Dynon Technical Support)

The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz. It will drive into an audio panel and put noise in your headset. We generate different noises for different alarms (general alarm, AoA, autopilot, altitude alerter...)



If you're looking to put it into a external buzzer or drive an external light, we can't be much help, as we didn't design it for that nor have we ever attempted it. With a small op-amp and 

 some thought it could be done for sure though. 

 ____________________________________________________________________________

  

  

   My question is; with the audio alarm signal(s) that the D10A produces(described by Dynon Tech Support), how can I tap into that signal for my LED circuit, and not screw it up for the intercom "audio in"?

  

   Any ideas?   Thanks for your help!!

  

 Mike Welch

 



 		 	   		  The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. Get busy.  [quote][b]

etienne.phillips(at)gmail
Guest

Posted: Wed May 12, 2010 9:13 pm Post subject: Dynon D10A audio alarm output signal

Hi Mike

As an alternative, would it not be easier and more reliable to use the serial stream output to get the AoA? Although this would involve a microprocessor, you would have direct access to the real AoA value at all times, not just when the alarm sounds. 

If you are looking for a strobe that flashes for all alarms, then your way is probably better, but if it's just for AoA, then I would suggest looking at the serial stream.

Thanks

Etienne



On 13 May 2010, at 2:14 AM, Mike Welch wrote:

[quote]Group,

 

  While searching Dynon's archives I found the following correspondence from a guy that wanted to do exactly the same thing as me......set the audio alert signal to ALSO activate a line of LEDs.

  In addition to the audio tone that the D10A emits, I want it to also power a "555 timer/decade counter---LED strobe circuit" that I built.

  The circuit is built,  now I just need to know a good way to send a power source to it from th D10A's alarm signal.

  Evidently, according to Dynon support, I can choose between a steady tone, or an increasing rate intermittant tone, increasing in frequency the closer one gets to critical AOA.

  I believe my decade counter circuit needs a solid 5-15volts, so I'd choose the steady tone.

 

  The following is the archived messages; 



QUESTION:

I am interested in connecting the AOA audio on my D10A to a device that would be audible or visible in the cabin of the RV-6. I assume the audio output is a modulated signal. Is there an easy way to convert this output to DC voltage that would drive a beeper/buzzer/warning light/whatever?

______________________________________________________________________________

ANSWER;  (from Dynon Technical Support)

The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz. It will drive into an audio panel and put noise in your headset. We generate different noises for different alarms (general alarm, AoA, autopilot, altitude alerter...)



If you're looking to put it into a external buzzer or drive an external light, we can't be much help, as we didn't design it for that nor have we ever attempted it. With a small op-amp and 

some thought it could be done for sure though. 

____________________________________________________________________________

 

 

  My question is; with the audio alarm signal(s) that the D10A produces(described by Dynon Tech Support), how can I tap into that signal for my LED circuit, and not screw it up for the intercom "audio in"?

 

  Any ideas?   Thanks for your help!!

 

Mike Welch



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[b]

mdnanwelch7(at)hotmail.co
Guest

Posted: Thu May 13, 2010 5:13 am Post subject: Dynon D10A audio alarm output signal

Etienne,

  

   No, I think I'd rather try to just "capture" all the alarms that the unit sends.  I wouldn't have the foggiest idea how to incoporate a microprocessor.  My present LED circuit simply needs the 5-15 volt electrical source to activate, then, similar to the KIT Knight 2000 rolling strobe LEDs, my circuit visually warns me of an alarm.  I've got the LED circuit done, I just would like to know if I can tap into that audio alarm signal.   

  

   Is there a relatively easy way of tapping into this alarm signal, and not ruin it's intended purpose?

 

 "The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz."

  

 Thanks,   

 Mike Welch

  

 		 	   		  The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. Get busy.  [quote][b]

etienne.phillips(at)gmail
Guest

Posted: Thu May 13, 2010 5:55 am Post subject: Dynon D10A audio alarm output signal

Ok, fair enough  I'm into microprocessors, so sometimes default to them for a solution!

  

 I would suggest simply feeding the signal line through a diode, 4k7 resistor, then into the base of a switching transistor (2N2222 would be perfect for this). Your LED circuit then goes between +12V and the collector of the transistor. Emitter goes straight to ground. You may also want to put a 0.1uF cap between the node between the diode and the resistor, and ground to keep the circuit active whilst the audio signal switches through ground endlessly. (I would draw a diagram, but am a bit stretched at the moment - shout if the explanaition isn't clear). 

   

 There is probably an less crude solution, but failing all else, I'm confident this would work...

  

 Comments?

  

 Speaking of crude, here's an ascii-pic:

  

 ______________________ +12V

                    |  

                  00000

                    |

 sig-|>|-,-/\/\/\--|<

         =          |

 ________|__________|__ 0V

  

  

 Thanks

 Etienne

 On 13 May 2010 15:09, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:

 [quote] Etienne,

 

  No, I think I'd rather try to just "capture" all the alarms that the unit sends.  I wouldn't have the foggiest idea how to incoporate a microprocessor.  My present LED circuit simply needs the 5-15 volt electrical source to activate, then, similar to the KIT Knight 2000 rolling strobe LEDs, my circuit visually warns me of an alarm.  I've got the LED circuit done, I just would like to know if I can tap into that audio alarm signal.   

  

  Is there a relatively easy way of tapping into this alarm signal, and not ruin it's intended purpose?  



 "The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz."

 

 

Thanks,   

 Mike Welch

 



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[b]

mdnanwelch7(at)hotmail.co
Guest

Posted: Thu May 13, 2010 6:41 am Post subject: Dynon D10A audio alarm output signal

Etienne,

  

   Your suggestion is VERY close to what I thought would work, although I lack the true knowledge to actually design it.  I do, however, understand what you're getting at!

  

   Your typed diagram doesn't quite clear things up, although I do understand your description well enough to build it.  Maybe, when you get some time later, you could post a drawing.

  

   In my thoughts of a way to do this;     I began with the diode, then the resistor, and then either a transistor, or an integrated circuit (like an astable circuit using the 555 timer), to pull out the power I needed.   

   I spent my career as a concrete contractor and general contractor, and lack the expertise to design an electrical circuit.  I can, generally, build a "basic" circuit, because I took some electronics training in the military 30 years ago.

  

   Thanks a lot!!

  

 Mike Welch  

 

  

  

   Date: Thu, 13 May 2010 15:53:38 +0200

Subject: Re: Dynon D10A audio alarm output signal

From: etienne.phillips(at)gmail.com

To: aeroelectric-list(at)matronics.com

 Ok, fair enough  I'm into microprocessors, so sometimes default to them for a solution!

  

 I would suggest simply feeding the signal line through a diode, 4k7 resistor, then into the base of a switching transistor (2N2222 would be perfect for this). Your LED circuit then goes between +12V and the collector of the transistor. Emitter goes straight to ground. You may also want to put a 0.1uF cap between the node between the diode and the resistor, and ground to keep the circuit active whilst the audio signal switches through ground endlessly. (I would draw a diagram, but am a bit stretched at the moment - shout if the explanaition isn't clear). 

  

 There is probably an less crude solution, but failing all else, I'm confident this would work...

  

 Comments?

  

 Speaking of crude, here's an ascii-pic:

  

 ______________________ +12V

                    |  

                  00000

                    |

 sig-|>|-,-/\/\/\--|<

         =          |

 ________|__________|__ 0V

  

  

 Thanks

 Etienne

 On 13 May 2010 15:09, Mike Welch <mdnanwelch7(at)hotmail.com (mdnanwelch7(at)hotmail.com)> wrote:

  	  Quote: 	
		   Etienne,

 

  No, I think I'd rather try to just "capture" all the alarms that the unit sends.  I wouldn't have the foggiest idea how to incoporate a microprocessor.  My present LED circuit simply needs the 5-15 volt electrical source to activate, then, similar to the KIT Knight 2000 rolling strobe LEDs, my circuit visually warns me of an alarm.  I've got the LED circuit done, I just would like to know if I can tap into that audio alarm signal.   

 

  Is there a relatively easy way of tapping into this alarm signal, and not ruin it's intended purpose?  



 "The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz."

 



Thanks,   

 Mike Welch

 



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nuckolls.bob(at)aeroelect
Guest

Posted: Thu May 13, 2010 8:44 am Post subject: Dynon D10A audio alarm output signal

"The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz."

  	  Quote: 	
		   

 I would suggest simply feeding the signal line through a diode, 4k7 resistor, then into the base of a switching transistor (2N2222 would be perfect for this). Your LED circuit then goes between +12V and the collector of the transistor. Emitter goes straight to ground. You may also want to put a 0.1uF cap between the node between the diode and the resistor, and ground to keep the circuit active whilst the audio signal switches through ground endlessly. (I would draw a diagram, but am a bit stretched at the moment - shout if the explanaition isn't clear). 

  

 There is probably an less crude solution, but failing all else, I'm confident this would work...

  

 Comments? 	


   Etienne is on a useful track . . . I'll suggest the

   following clarification/amplification:



  http://aeroelectric.com/Pictures/Schematics/Dynon_Alarm_Tone_Detector.pdf 



   This circuit ASSUMES that when no tone is present, that the

   DC voltage on the Dynon Alarm Tone Output is zero volts.

   Check this with your voltmeter before marching on . . .



   The 10K isolation resistor reduces loading on the normal

   audio signal.



   The 2N3904 is a half-wave rectifier that pulls down

   on the charge stored on the 1 uF tantalum electrolytic.

   When the tone is present, the capacitor discharges

   on positive excursions of the alarm tone through 

   the 1K ohm resistor and 2N3904. This in turn pulls

   down on the base of 2N3906 and turns on the light.



   The R/C time-constant of the 1uf capacitor and

   a pair of 10K pull up resistors will keep the

   light turned on during negative excursions of

   the alarm tone signal. When the alarm tone goes

   away, the two 10K resistors in series pull the

   base of 2N3906 to the +12 rail and turns it

   OFF.



   Bob . . .      

     [quote][b]

sprocket(at)vx-aviation.c
Guest

Posted: Thu May 13, 2010 9:04 am Post subject: Dynon D10A audio alarm output signal

Been there, done that:  see [url=http://vx-aviation.com/page_2.html#V-Speed Auxiliary Display System]http://vx-aviation.com/page_2.html#V-Speed  Auxiliary Display System[/url]

  

 Thats the good news.  The bad news is that it  is no longer available.  Since the product was first introduced, Dynon  subsequently added a larger visual representation on screen and the audible  alarm.  Both of these go a long way to mitigating the need for an external  display.   Nevertheless, the product was popular... but it was too  costly to continue to sell at the price offered.

  

 I might have some circuit boards and  programmed microcontrollers left in inventory that could be pried  away, please contact me off list using the email address on the vx aviation  site.

  

 Thanks

 Vern Little

 www.vx-aviation.com

 [/url] 

  

  



  From: Etienne Phillips (etienne.phillips(at)gmail.com) 

 Sent: Wednesday, May 12, 2010 10:09 PM

 To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com)  

 Subject: Re: Dynon D10A audio alarm output  signal

 



 Hi Mike

 



 As an alternative, would it not be easier and more reliable to use the  serial stream output to get the AoA? Although this would involve a  microprocessor, you would have direct access to the real AoA value at all times,  not just when the alarm sounds. 

 



 If you are looking for a strobe that flashes for all alarms,  then your way is probably better, but if it's just for AoA, then I would suggest  looking at the serial stream.

 



 Thanks

 Etienne



  On 13 May 2010, at 2:14 AM, Mike Welch wrote:

  	  Quote: 	
		     Group,

 

  While    searching Dynon's archives I found the following correspondence from a guy    that wanted to do exactly the same thing as me......set the audio alert signal    to ALSO activate a line of LEDs.

  In addition to the audio tone that the D10A emits, I want it to    also power a "555 timer/decade counter---LED strobe circuit"    that I built.

  The    circuit is built,  now I just need to know a good way to send a power    source to it from th D10A's alarm signal.

  Evidently, according to Dynon support, I    can choose between a steady tone, or an increasing rate intermittant tone,    increasing in frequency the closer one gets to critical AOA.

  I believe my decade counter circuit    needs a solid 5-15volts, so I'd choose the steady tone.

 

  The following is the archived    messages; 



QUESTION:

I am interested in    connecting the AOA audio on my D10A to a device that would be audible or    visible in the cabin of the RV-6. I assume the audio output is a modulated    signal. Is there an easy way to convert this output to DC voltage that would    drive a beeper/buzzer/warning    light/whatever?

______________________________________________________________________________

ANSWER;     (from Dynon Technical Support)

The output of the audio line is 16.8V    peak-peak, at 1k ohm of impedance, and between 200 and 1KHz. It will drive    into an audio panel and put noise in your headset. We generate different    noises for different alarms (general alarm, AoA, autopilot, altitude    alerter...)



If you're looking to put it into a external buzzer or drive    an external light, we can't be much help, as we didn't design it for that nor    have we ever attempted it. With a small op-amp and 

some thought it could be    done for sure though. 

____________________________________________________________________________

 

 

  My question    is; with the audio alarm signal(s) that the D10A produces(described by Dynon    Tech Support), how can I tap into that signal for my LED circuit, and not    screw it up for the intercom "audio in"?

 

  Any ideas?   Thanks for your    help!!

 

Mike Welch



      The New Busy is not the too busy. Combine all your e-mail accounts with    Hotmail. [url=http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4]Get busy. 	  Quote: 	
		  



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   Release Date:  05/13/10 06:26:00

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mdnanwelch7(at)hotmail.co
Guest

Posted: Thu May 13, 2010 12:41 pm Post subject: Dynon D10A audio alarm output signal

Hi Vern,

  

   For my present airplane (with the Dynon D10A, I already have built the strobing LED circuit.  I just needed clarification on how to grab some of that audio signal, without screwing everything up.

   So, at this time, and for what I already have, I think Bob's version of Etienne's design is what I should go after.

  

   However!!  I do have another D10A that is planned for my GlaStar, and your circuitry would be a serious consideration.

   I'll contact you off-list for more info.

  

   Thanks for everyone's help.

  

 Mike Welch

 

  From: sprocket(at)vx-aviation.com

To: aeroelectric-list(at)matronics.com

Subject: Re: Dynon D10A audio alarm output signal

Date: Thu, 13 May 2010 10:03:08 -0700



 Been there, done that:  see [url=http://vx-aviation.com/page_2.html#V-Speed Auxiliary Display System]http://vx-aviation.com/page_2.html#V-Speed Auxiliary Display System[/url]

  

 Thats the good news.  The bad news is that it is no longer available.  Since the product was first introduced, Dynon subsequently added a larger visual representation on screen and the audible alarm.  Both of these go a long way to mitigating the need for an external display.   Nevertheless, the product was popular... but it was too costly to continue to sell at the price offered.

  

 I might have some circuit boards and programmed microcontrollers left in inventory that could be pried away, please contact me off list using the email address on the vx aviation site.

  

 Thanks

 Vern Little

 www.vx-aviation.com

 [/url] 

  

  



  From: Etienne Phillips (etienne.phillips(at)gmail.com) 

 Sent: Wednesday, May 12, 2010 10:09 PM

 To: aeroelectric-list(at)matronics.com (aeroelectric-list(at)matronics.com) 

 Subject: Re: Dynon D10A audio alarm output signal

 



 Hi Mike

 



 As an alternative, would it not be easier and more reliable to use the serial stream output to get the AoA? Although this would involve a microprocessor, you would have direct access to the real AoA value at all times, not just when the alarm sounds. 

 



 If you are looking for a strobe that flashes for all alarms, then your way is probably better, but if it's just for AoA, then I would suggest looking at the serial stream.

 



 Thanks

 Etienne



  On 13 May 2010, at 2:14 AM, Mike Welch wrote:

  	  Quote: 	
		   Group,

 

  While searching Dynon's archives I found the following correspondence from a guy that wanted to do exactly the same thing as me.....set the audio alert signal to ALSO activate a line of LEDs.

  In addition to the audio tone that the D10A emits, I want it to also power a "555 timer/decade counter---LED strobe circuit" that I built.

  The circuit is built,  now I just need to know a good way to send a power source to it from th D10A's alarm signal.

  Evidently, according to Dynon support, I can choose between a steady tone, or an increasing rate intermittant tone, increasing in frequency the closer one gets to critical AOA.

  I believe my decade counter circuit needs a solid 5-15volts, so I'd choose the steady tone.

 

  The following is the archived messages; 



QUESTION:

I am interested in connecting the AOA audio on my D10A to a device that would be audible or visible in the cabin of the RV-6. I assume the audio output is a modulated signal. Is there an easy way to convert this output to DC voltage that would drive a beeper/buzzer/warning light/whatever?

______________________________________________________________________________

ANSWER;  (from Dynon Technical Support)

The output of the audio line is 16.8V peak-peak, at 1k ohm of impedance, and between 200 and 1KHz. It will drive into an audio panel and put noise in your headset. We generate different noises for different alarms (general alarm, AoA, autopilot, altitude alerter...)



If you're looking to put it into a external buzzer or drive an external light, we can't be much help, as we didn't design it for that nor have we ever attempted it. With a small op-amp and 

some thought it could be done for sure though. 

____________________________________________________________________________

 

 

  My question is; with the audio alarm signal(s) that the D10A produces(described by Dynon Tech Support), how can I tap into that signal for my LED circuit, and not screw it up for the intercom "audio in"?

 

  Any ideas?   Thanks for your help!!

 

Mike Welch



  The New Busy is not the too busy. Combine all your e-mail accounts with Hotmail. [url=http://www.windowslive.com/campaign/thenewbusy?tile=multiaccount&ocid=PID28326::T:WLMTAGL:ON:WL:en-US:WM_HMP:042010_4]Get busy. 	  Quote: 	
		  



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mdnanwelch7(at)hotmail.co
Guest

Posted: Fri May 14, 2010 6:39 am Post subject: Dynon D10A audio alarm output signal

Bob,



 



  Regarding your circuit, I've got the 3906, but I don't have the 3904.  Is it okay to switch the 3904 with a 2N4401?  I have some of these on hand.



 



  Also, I'm having a bit of trouble finding the specific electrolytic tantalum capacitor on Digikey.  Do you have a part number?  Thanks.



 



Mike Welch



 



 

 		 	   		  

_________________________________________________________________

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nuckolls.bob(at)aeroelect
Guest

Posted: Fri May 14, 2010 10:26 am Post subject: Dynon D10A audio alarm output signal

At 09:21 AM 5/14/2010, you wrote:

  	  Quote: 	
		  Bob,

  

   Regarding your circuit, I've got the 3906, but I don't have the 3904.  Is it okay to switch the 3904 with a 2N4401?  I have some of these on hand. 	


   ANY jelly bean pnp, npn pair can be used here. It's

   exceedingly non-critical.

  	  Quote: 	
		   

   Also, I'm having a bit of trouble finding the specific electrolytic tantalum capacitor on Digikey.  Do you have a part number?  Thanks. 	


   ANY 1 uf tantalum (or aluminum for that matter)

   would be fine too. Radio Shack has a suitable

   part here:



  http://www.radioshack.com/product/index.jsp?productId 62392



   If you're ordering OTHER things from Digikey too then

   this one would work.



   http://search.digikey.com/scripts/DkSearch/dksus.dll?Detail&name=399-3528-ND

 

   Did you check the output voltage when no tone is present?



   Also, it occurs to me that the output tone COULD

   be capacitively coupled . . . which means we'll need

   to add a diode to the circuit. But it will be a RS

   part too . . . so marching ahead with the current

   experiment is a good thing.



    Bob . . .    [quote][b]

mdnanwelch7(at)hotmail.co
Guest

Posted: Fri May 14, 2010 12:59 pm Post subject: Dynon D10A audio alarm output signal

Bob,

  

   Mike (at) Dynon Tech support confirms--zero voltage when alarm is not sounding.

  

   What about that diode you mentioned?  Probably wouldn't hurt, right?

  

   And why do they still call it Radio Shack?  Shouldn't rename themselves Cell Phone Shack??

  

 Mike Welch



 		 	   		  Hotmail is redefining busy with tools for the New Busy. Get more from your inbox. See how.  [quote][b]

nuckolls.bob(at)aeroelect
Guest

Posted: Mon May 17, 2010 8:28 am Post subject: Dynon D10A audio alarm output signal

Bob, 



 Mike (at) Dynon Tech support confirms--zero voltage when alarm is not sounding. 



    Okay, it would be interesting to see their output schematic

    but . . .



 What about that diode you mentioned? Probably wouldn't hurt, right? 



    . . . you are correct. We can design for the worst case

    and assume the output is capacitor coupled. I should have

    done that first step out of the gate.  See changes

    to the schematic at:



  http://aeroelectric.com/Pictures/Schematics/Dynon_Alarm_Tone_Detector_A.pdf

 

 And why do they still call it Radio Shack? Shouldn't rename themselves Cell Phone Shack?? 



    Hmmm . . . Radio Shack has indeed experienced

    a constellation of changes in marketing philosophy

    over the years. The fact that they still exist 

    amongst the big-box outlets is a demonstration of

    their recipes for success. But when you've got many

    store fronts and advertisements spread over so much

    area, its a sure bet that their logo and brand name

    have significant good-will value.



    I suspect the ol' "If it ain't broke, don't fix it"

    rule is in effect here.



    Bob . . .

        [quote][b]

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