---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Sat 11/07/09: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 0. 12:23 AM - Please Make A Contribution To Support Your Lists (Matt Dralle) 1. 04:59 AM - Re: p-lead signal conditioning or tach gen usage (Craig Winkelmann) 2. 05:45 AM - Re: Re: p-lead signal conditioning or tach gen usage (Robert L. Nuckolls, III) 3. 07:34 AM - Re: Garmin GNS 530 Internal Battery (joburke) ________________________________ Message 0 _____________________________________ Time: 12:23:56 AM PST US From: Matt Dralle Subject: AeroElectric-List: Please Make A Contribution To Support Your Lists Dear Listers, There is no advertising income to support the Matronics Email Lists and Forums. The operation is supported 100% by your personal Contributions during the November Fund Raiser. Please make your Contribution today to support the continued operation and upgrade of these services. You can pick up a really nice gift for making your Contribution too! You may use a Credit Card or Paypal at the Matronics Contribution Site here: http://www.matronics.com/contribution or, you can send a personal check to the following address: Matronics / Matt Dralle PO Box 347 Livermore, CA 94551-0347 Thank you in advance for your generous support! Matt Dralle Matronics Email List and Forum Administrator ________________________________ Message 1 _____________________________________ Time: 04:59:21 AM PST US Subject: AeroElectric-List: Re: p-lead signal conditioning or tach gen usage From: "Craig Winkelmann" Bob: I have assumes that the windings are Y-wound and not delta. The connector for the unit only has three pins and they are labeled a, b, and c. I am assuming by your comment that we are using two phases that we have picked up the signal improperly from the tach gen itself. However, when we tried to get a signal from one pin with the case as ground reference, we had no signal at all. Craig Read this topic online here: http://forums.matronics.com/viewtopic.php?p=271542#271542 ________________________________ Message 2 _____________________________________ Time: 05:45:45 AM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: p-lead signal conditioning or tach gen usage At 06:57 AM 11/7/2009, you wrote: > > >Bob: > >I have assumes that the windings are Y-wound and not delta. The >connector for the unit only has three pins and they are labeled a, b, and c. > >I am assuming by your comment that we are using two phases that we >have picked up the signal improperly from the tach gen >itself. However, when we tried to get a signal from one pin with >the case as ground reference, we had no signal at all. Understand . . . and it's what I would have expected. So there's no "improper" connection, only a "less than ideal" connection. The design goal is to craft a squaring circuit that has the narrowest window of uncertainty that is centered in the area of the waveform least likely to be problematic. What are the specs for signal input to your engine monitor? Does the square wave need to be of any particular "sqareness" i.e. rate of change or simply "clean" and free of extraneous changes in direction. If I were designing such an instrument, I'd be interested only in a clean representation of period be it a sine wave, pulse, trapezoid, etc . . . all I'm doing is counting transitions from highest to lowest voltage. I'd do all of my "squaring" internally to accommodate the needs of the electronics. So I'm betting that if you get a clean 5v signal of any shape . . . the electronics will be happy. Bob . . . --------------------------------------- ( It's MATRONICS FUND RAISER MONTH! ) ( Do your part to keep this marvelous ) ( tool sharp and available to all our ) ( brothers in the OBAM aviation ) ( community. ) --------------------------------------- ________________________________ Message 3 _____________________________________ Time: 07:34:37 AM PST US Subject: AeroElectric-List: Re: Garmin GNS 530 Internal Battery From: "joburke" Did you ever find a source for this information? I'm looking for the same thing. Thanks. 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