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Subject: Re: Finding 0 voltage in analog signals

Date: 01/24/02 at 3:19 PM
Posted by: corry
E-mail: corry@unt.edu
Message Posted:

In Reply to: Re: Finding 0 voltage in analog signals posted by David Ashby on 01/24/02 at 6:34 AM:

To be totally honest, I am not totally sure on all of that :) Yes I was planning on using chassis ground, and was told that something as simple as a 10 uF cap in between would be enough, but your method sounds much better so I will plan on using that. However, if the '-' wire goes to chassis ground, then I will need to get it to chassis ground, or I'll have to get that wire to ground. If I do that, won't that re-introduce the noise? Should I put in a capictor then? I understand the necessity to not falsly trigger, after all, I am trying to make this thing accurate so there can be no question when the inspection station looks at it (worst case I am sure I could get it state certified somehow so long as it is accurate). I also know my car makes lotsa electrical noise! I still have to put in a filter to my car stereo since I hear a nice rpm based noise in my radio. As for the peak to peak voltage, I have a question posted on a forum for thirdgen GM F-Body cars (Firebirds and Camaros) Just in case anyone here is interested in these cars, the site is http://www.thirdgen.org They have some people there who really know their cars, and have given me info to fix my car on many many many occasions :) Unfortunatly, the digital dash option was rare, usually only on the Trans Am's upgraded to the GTA model which in 1987 (the year of my car) I believe there were a total of 2500 or so GTA's made.
Again, thanks for the help here! I will definatly remember this site for my EE questions :) (If you can't tell, I try and learn about as much as I can, I build/repair/upgrade/network/program computers, I repair my own car, and now I have started dabbling in Digital logic, and basic electronics :) BTW, my next project is I am going to rebuild an old vacume tube amplifier, then just to be funny, and almost artistic, I want to make the vacume tube amp digitally controlled, including remote control! :)
Corry


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