Today's Message Index:
----------------------
1. 07:29 AM - Re: Electronic Ignition spark advance signal boost (Airdog77)
2. 08:14 AM - Re: Radiated Electronic Noise (not a grounding issue?) (user9253)
3. 08:34 AM - Re: Re: Electronic Ignition spark advance signal boost (C&K)
4. 08:52 AM - Re: Re: Electronic Ignition spark advance signal boost (Charlie England)
5. 09:31 AM - Re: Electronic Ignition spark advance signal boost (Robert L. Nuckolls, III)
6. 01:35 PM - 2017 List of Contributors (Matt Dralle)
7. 04:28 PM - Re: Electronic Ignition spark advance signal boost (Airdog77)
Message 1
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| Subject: | Re: Electronic Ignition spark advance signal boost |
Ken,
I think I've got the function of the non inverting op amp down.... pretty cool.
Just a couple of questions before I pull the trigger on purchasing any.
I noticed on Mouser that the input voltage is usually 1.8, 2.7 or 4.5 volts. Am
I reading this right that those are +/- input volt, so say -1.8V to +1.8V.
May seem like a silly question, but just asking since I need 0V or 0.01 volts
covered as a possible input voltage.
Also, I think I've got it right that the R1 and R2 resistors values are set simply
as a ratio to provide the correct gain. Are the resistor values completely
arbitrary, or any standards that I should be following? Right now I have R2
= 500 Ohm, R1 = 4.5K Ohm.
Again, thanks for the info on these op amps. Neat stuff.
Cheers,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476462#476462
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| Subject: | Re: Radiated Electronic Noise (not a grounding issue?) |
If MGL were made aware of your video, they might be more responsive to your support
request. That video must be hurting their sales. It looks like the EFIS
needs to be repaired. Another experiment would be to wrap tinfoil around the
top and front and bottom edge of the instrument panel wide enough to cover
the EFIS. That experiment would reinforce your theory that RF noise is being
emitted from the EFIS screen. Have you tried dimming the EFIS display to see
if that has an affect?
--------
Joe Gores
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476464#476464
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| Subject: | Re: Electronic Ignition spark advance signal boost |
Wade
A very good question.
If no one else replies I will do a little research this evening.
We want a single supply op amp that will run on 5 volts and is rail to
rail output (ie down to zero volts output).
Typically these are cmos type technology that run on a wide range of
voltage and consume negligible power in an application like this.
I will have to refresh my memory but I'm pretty sure down to .01 volts
is doable on a single supply op amp these days. Years ago an op amp
would be run on a dual +5 volt and -5 volt supply to do this. Someone
might offer to drop one in the mail and I will look around here. I'd
probably suggest initially trying more like 1K ohms for the input
resistor. Might need a bit higher if too low a value drags down the
input signal. A tiny adjustable resistor can always be used to tweak the
gain to precisely what you need.
Ken
On 17/12/2017 10:28 AM, Airdog77 wrote:
>
> Ken,
>
> I think I've got the function of the non inverting op amp down.... pretty cool.
Just a couple of questions before I pull the trigger on purchasing any.
>
> I noticed on Mouser that the input voltage is usually 1.8, 2.7 or 4.5 volts.
Am I reading this right that those are +/- input volt, so say -1.8V to +1.8V.
May seem like a silly question, but just asking since I need 0V or 0.01 volts
covered as a possible input voltage.
>
> Also, I think I've got it right that the R1 and R2 resistors values are set simply
as a ratio to provide the correct gain. Are the resistor values completely
arbitrary, or any standards that I should be following? Right now I have
R2 = 500 Ohm, R1 = 4.5K Ohm.
>
> Again, thanks for the info on these op amps. Neat stuff.
>
> Cheers,
> Wade
>
> --------
> Airdog
> Wade Parton
> Building Long-EZ N916WP
> www.longezpush.com
>
>
> Read this topic online here:
>
> http://forums.matronics.com/viewtopic.php?p=476462#476462
>
>
Message 4
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| Subject: | Re: Electronic Ignition spark advance signal boost |
I'd consider running the op amp on 12V instead of 5V. Since you want the
max output to be so close to 5V to drive the instrument input on the
efis, using 12V should help keep the output linear.
On 12/17/2017 10:33 AM, C&K wrote:
>
> Wade
> A very good question.
> If no one else replies I will do a little research this evening.
> We want a single supply op amp that will run on 5 volts and is rail to
> rail output (ie down to zero volts output).
> Typically these are cmos type technology that run on a wide range of
> voltage and consume negligible power in an application like this.
> I will have to refresh my memory but I'm pretty sure down to .01 volts
> is doable on a single supply op amp these days. Years ago an op amp
> would be run on a dual +5 volt and -5 volt supply to do this. Someone
> might offer to drop one in the mail and I will look around here. I'd
> probably suggest initially trying more like 1K ohms for the input
> resistor. Might need a bit higher if too low a value drags down the
> input signal. A tiny adjustable resistor can always be used to tweak
> the gain to precisely what you need.
> Ken
>
>
> On 17/12/2017 10:28 AM, Airdog77 wrote:
>>
>> Ken,
>>
>> I think I've got the function of the non inverting op amp down....
>> pretty cool. Just a couple of questions before I pull the trigger on
>> purchasing any.
>>
>> I noticed on Mouser that the input voltage is usually 1.8, 2.7 or 4.5
>> volts. Am I reading this right that those are +/- input volt, so say
>> -1.8V to +1.8V. May seem like a silly question, but just asking
>> since I need 0V or 0.01 volts covered as a possible input voltage.
>>
>> Also, I think I've got it right that the R1 and R2 resistors values
>> are set simply as a ratio to provide the correct gain. Are the
>> resistor values completely arbitrary, or any standards that I should
>> be following? Right now I have R2 = 500 Ohm, R1 = 4.5K Ohm.
>>
>> Again, thanks for the info on these op amps. Neat stuff.
>>
>> Cheers,
>> Wade
>>
>> --------
>> Airdog
>> Wade Parton
>> Building Long-EZ N916WP
>> www.longezpush.com
---
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| Subject: | Re: Electronic Ignition spark advance signal boost |
>
>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.
Emacs!
Bob . . .
Message 6
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| Subject: | 2017 List of Contributors |
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Message 7
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| Subject: | Re: Electronic Ignition spark advance signal boost |
Bob,
Wow.... thanks! Really takes the guesswork out of configuring the amp for a gain
of 10.
I'm thinking it most likely doesn't matter, but just to be certain: the Electroair
spark advance signal is only sent out over one wire, so I would not have any
input from the Electroair unit to Pin 1 on the AD626. I assume this is ok
for this configuration?
Thanks again!
Regards,
Wade
--------
Airdog
Wade Parton
Building Long-EZ N916WP
www.longezpush.com
Read this topic online here:
http://forums.matronics.com/viewtopic.php?p=476550#476550
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