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Electronic Ignition spark advance signal boost CORRECTION

 
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nuckolls.bob(at)aeroelect
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PostPosted: Mon Dec 18, 2017 4:24 pm    Post subject: Electronic Ignition spark advance signal boost CORRECTION Reply with quote

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 . . .


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Airdog77



Joined: 24 Nov 2013
Posts: 79
Location: Northern Virginia

PostPosted: Mon Jan 08, 2018 5:38 pm    Post subject: Re: Electronic Ignition spark advance signal boost CORRECTIO Reply with quote

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


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