---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sun 12/17/17: 7 ---------------------------------------------------------- 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 _____________________________________ Time: 07:29:27 AM PST US Subject: AeroElectric-List: Re: Electronic Ignition spark advance signal boost From: "Airdog77" 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 2 _____________________________________ Time: 08:14:25 AM PST US Subject: AeroElectric-List: Re: Radiated Electronic Noise (not a grounding issue?) From: "user9253" 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 ________________________________ Message 3 _____________________________________ Time: 08:34:11 AM PST US Subject: Re: AeroElectric-List: Re: Electronic Ignition spark advance signal boost From: C&K 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 _____________________________________ Time: 08:52:23 AM PST US Subject: Re: AeroElectric-List: Re: Electronic Ignition spark advance signal boost From: Charlie England 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 --- This email has been checked for viruses by Avast antivirus software. https://www.avast.com/antivirus ________________________________ Message 5 _____________________________________ Time: 09:31:55 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: 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 _____________________________________ Time: 01:35:30 PM PST US From: Matt Dralle Subject: AeroElectric-List: 2017 List of Contributors Dear Listers, The 2017 Matronics Email List and Forum Fund Raiser officially ended a couple of weeks ago and it's time that I published this year's List of Contributors (LOC). It is the people on this list that directly make these Email Lists and Forums possible! Their generous Contributions keep the servers and Internet connection up and running! You can still show your support this year and pick up a great gift at the same time. The Contribution Web Site is fast, easy, and secure: http://www.matronics.com/contribution Or, by dropping a personal check in the mail to: Matt Dralle / Matronics 581 Jeannie Way Livermore CA 94550 And finally, I'm proud to present The 2017 Fund Raiser List of Contributors: http://www.matronics.com/loc Thank you again to everyone that made a Contribution this year!! Matt Dralle Matronics Email List & Forum Administrator ________________________________ Message 7 _____________________________________ Time: 04:28:28 PM PST US Subject: AeroElectric-List: Re: Electronic Ignition spark advance signal boost From: "Airdog77" 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 ------------------------------------------------------------------------------------- Other Matronics Email List Services ------------------------------------------------------------------------------------- Post A New Message aeroelectric-list@matronics.com UN/SUBSCRIBE http://www.matronics.com/subscription List FAQ http://www.matronics.com/FAQ/AeroElectric-List.htm Web Forum Interface To Lists http://forums.matronics.com Matronics List Wiki http://wiki.matronics.com Full Archive Search Engine http://www.matronics.com/search 7-Day List Browse http://www.matronics.com/browse/aeroelectric-list Browse Digests http://www.matronics.com/digest/aeroelectric-list Browse Other Lists http://www.matronics.com/browse Live Online Chat! http://www.matronics.com/chat Archive Downloading http://www.matronics.com/archives Photo Share http://www.matronics.com/photoshare Other Email Lists http://www.matronics.com/emaillists Contributions http://www.matronics.com/contribution ------------------------------------------------------------------------------------- These Email List Services are sponsored solely by Matronics and through the generous Contributions of its members.