Matronics Email Lists :: View topic - Electronic Ignition spark advance signal boost CORRECTION

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

Electronic Ignition spark advance signal boost CORRECTION

Matronics Email Lists Forum Index -> AeroElectric-List

View previous topic :: View next topic

Author Message

nuckolls.bob(at)aeroelect
Guest

Posted: Mon Dec 18, 2017 4:24 pm Post subject: Electronic Ignition spark advance signal boost CORRECTION

 	  Quote: 	
		  

 The Electroair spark advance signal voltage output is from 0.00V to 0.40V, and is scaled 0.01 volt per every degree of advance.  So just to be clear:

 0.01V = 1 degree of advance

 0.10V = 10 degrees of advance

 0.28V = 28 degrees of advance



 What I would like to achieve is to amplify the spark advance signal voltage x 10 so that the GRT could see every 0.1V as 1 degree of spark advance, so again for clarity:

 0.1V = 1 degree of advance

 1.0V = 10 degrees of advance

 2.8V = 28 degrees of advance 	


   There are hundreds of combinations of jelly-bean

   parts that would suffice to your design goals.

   My personal favorite of the moment is the Analog

   Devices AD626 instrumentation grade amplifier.

   It works well at 5.0 volt supply, has a huge

   common mode input range, features factory trimmed

   preset gains of 10 or 100. Has an output range

   that easily brackets your requirement (0.03 to 4.7v).



   The beauty of this critter is that no external

   resistors or calibration adjustments are needed

   to address your task.



 https://goo.gl/Q3SYvj

 

   They're a little pricey compared to some other

   candidates



 https://goo.gl/fxuF4Z

 

   but I think the convenience of minimizing

   external components combined with the simplicity

   of calibration more than offsets the difference

   in cost.  I used this chip in dozens of data

   acquisition tasks at Beech . . . it's still

   a work-horse in my toolbox of get-er-done parts.



   CORRECTION . . .



   Must have suffered a transient short between the

   headphones. Blew of the AD626 feature that makes

   it 'magic'.



   The inputs have a huge common mode signal rejection

   range. This means that it amplifies only what is

   impressed between pins 1 and 8 while ignoring

   the difference in voltage between 1,8 and 2,3.

  

   Hence, you tie pin 1 as close as practical to 

   ignition system ground, pin 8 to the advance

   signal output. Amplifier ground pins 2,3 tie

   to EFIS signal ground. This insures that the

   output between 5/2,3 is 10x that between 8/1

   irrespective of any difference in 'ground'

   of the ignition system vs. the EFIS system.



 [img]cid:7.1.0.9.0.20171218181736.0714d190(at)aeroelectric.com.1[/img] 



 



 

 

   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

dbf54a.jpg

Description:

Filesize:

110.67 KB

Viewed:

2500 Time(s)

Airdog77

Joined: 24 Nov 2013
Posts: 80
Location: Northern Virginia

Posted: Mon Jan 08, 2018 5:38 pm Post subject: Re: Electronic Ignition spark advance signal boost CORRECTIO

Bob,



I missed this post earlier and noted your comment Re. this corrected diagram in the other thread.



I'm hoping 4-5" from the case is close enough to tie into the ground wire for pin 1 input?  As I mention in the other thread, for some reason the ground wire on this unit is massive, around 12-14AWG.  



Thanks,

Wade

- 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

_________________
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com

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