---------------------------------------------------------- AeroElectric-List Digest Archive --- Total Messages Posted Fri 07/08/16: 4 ---------------------------------------------------------- Today's Message Index: ---------------------- 1. 02:06 AM - Re: Cheap-n-Dirty In-Line ATC (Bob Verwey) 2. 12:46 PM - Re: do I need to change my capacitor (jrevens) 3. 03:58 PM - Re: Re: do I need to change my capacitor (Charlie England) 4. 04:04 PM - Re: Re: do I need to change my capacitor (Robert L. Nuckolls, III) ________________________________ Message 1 _____________________________________ Time: 02:06:55 AM PST US From: Bob Verwey Subject: Re: AeroElectric-List: Cheap-n-Dirty In-Line ATC That is a really frugal solution, fraught with simplicity and lightness! On 7 July 2016 at 20:09, Robert L. Nuckolls, III < nuckolls.bob@aeroelectric.com> wrote: > Needed to add a fuse to a device with limited > space and very low current requirements. Wound > up adding this ATC3 fuse to the gizmo using fast-ons > and heat shrink. While not as robust as a legacy > fuse-holder, the manner in which terminals are > retained in the ATC fuse doesn't raise much concern > for over stressing them with direct support > of 22AWG wire. > > > [image: Emacs!] > > Bob . . . > -- Best... Bob Verwey ________________________________ Message 2 _____________________________________ Time: 12:46:11 PM PST US Subject: AeroElectric-List: Re: do I need to change my capacitor From: "jrevens" On another internet forum the question was posed - "Why do you need a capacitor on the Rotax charging system?" A reply was posted by another member: "In our charging systems, the stator produces AC output which goes to the regulator/rectifier. The ouput of that is DC plus an AC voltage on top of it. A capacitor is often used to filter out higher frequency AC ripple on the rectified DC supply. It helps keep the electronics happy and audio quiet." I'm curious if this is an accurate statement, or not. -------- John Evens Thorp T-18 N71JE (built & flying) Kitfox SS7 N27JE (building) Read this topic online here: http://forums.matronics.com/viewtopic.php?p=457943#457943 ________________________________ Message 3 _____________________________________ Time: 03:58:34 PM PST US Subject: RE: AeroElectric-List: Re: do I need to change my capacitor From: Charlie England CgotLS0tLS0tLSBPcmlnaW5hbCBtZXNzYWdlIC0tLS0tLS0tCkZyb206IGpyZXZlbnMKRGF0ZTow Ny8wOC8yMDE2IDI6NDQgUE0gKEdNVC0wNjowMCkKVG86IGFlcm9lbGVjdHJpYy1saXN0QG1hdHJv bmljcy5jb20KU3ViamVjdDogQWVyb0VsZWN0cmljLUxpc3Q6IFJlOiBkbyBJIG5lZWQgdG8gY2hh bmdlIG15IGNhcGFjaXRvcgoKLS0+IEFlcm9FbGVjdHJpYy1MaXN0IG1lc3NhZ2UgcG9zdGVkIGJ5 OiAianJldmVucyIgPGpyZXZlbnNAY29tY2FzdC5uZXQ+CgpPbiBhbm90aGVyIGludGVybmV0IGZv cnVtIHRoZSBxdWVzdGlvbiB3YXMgcG9zZWQgLSAiV2h5IGRvIHlvdSBuZWVkIGEgY2FwYWNpdG9y IG9uIHRoZSBSb3RheCBjaGFyZ2luZyBzeXN0ZW0/IiAgQSByZXBseSB3YXMgcG9zdGVkIGJ5IGFu b3RoZXIgbWVtYmVyOgoKIkluIG91ciBjaGFyZ2luZyBzeXN0ZW1zLCB0aGUgc3RhdG9yIHByb2R1 Y2VzIEFDIG91dHB1dCB3aGljaCBnb2VzIHRvIHRoZSByZWd1bGF0b3IvcmVjdGlmaWVyLiBUaGUg b3VwdXQgb2YgdGhhdCBpcyBEQyBwbHVzIGFuIEFDIHZvbHRhZ2Ugb24gdG9wIG9mIGl0LiBBIGNh cGFjaXRvciBpcyBvZnRlbiB1c2VkIHRvIGZpbHRlciBvdXQgaGlnaGVyIGZyZXF1ZW5jeSBBQyBy aXBwbGUgb24gdGhlIHJlY3RpZmllZCBEQyBzdXBwbHkuIEl0IGhlbHBzIGtlZXAgdGhlIGVsZWN0 cm9uaWNzIGhhcHB5IGFuZCBhdWRpbyBxdWlldC4iIAoKSSdtIGN1cmlvdXMgaWYgdGhpcyBpcyBh biBhY2N1cmF0ZSBzdGF0ZW1lbnQsIG9yIG5vdC4KCi0tLS0tLS0tCkpvaG4gRXZlbnMKVGhvcnAg VC0xOCBONzFKRSAoYnVpbHQgJmFtcDsgZmx5aW5nKQpLaXRmb3ggU1M3IE4yN0pFIChidWlsZGlu ZykKCk5vdCBleGFjdGx5IGFjY3VyYXRlLiBUaGVyZSdzIG5vIEFDIG9uIHRoZSBvdXRwdXQgb2Yg dGhlIHJlY3RpZmllci4gVGhlcmUgaXMgYSByaXBwbGUgb2YgdmFyeWluZyBEQyB2b2x0YWdlLCB3 aGljaCBpcyB3aGF0IHRoZSBmaWx0ZXIgY2FwYWNpdG9yIGlzIHN1cHBvc2VkIHRvIHNtb290aC4g V2l0aCB0aGUgY3VycmVudCBjcm9wIG9mIHN3aXRjaGluZyBzdHlsZSByZWd1bGF0b3JzLCB0aGVy ZSAqc2hvdWxkKiBiZSBsaXR0bGUgdG8gbm8gcmlwcGxlLCBidXQgdGhlcmUgbWlnaHQgYmUgc29t ZSBoaWdoZXIgZnJlcXVlbmN5IG5vaXNlIGZyb20gdGhlIHN3aXRjaGVyLgoKTmVlZGVkPyBPbmx5 IHlvdSBjYW4ga25vdyBmb3Igc3VyZS4KCgoKCgoKCgoKCl8tPT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09Cl8tPSAgICAgICAgICAtIFRo ZSBBZXJvRWxlY3RyaWMtTGlzdCBFbWFpbCBGb3J1bSAtCl8tPSBVc2UgdGhlIE1hdHJvbmljcyBM aXN0IEZlYXR1cmVzIE5hdmlnYXRvciB0byBicm93c2UKXy09IHRoZSBtYW55IExpc3QgdXRpbGl0 aWVzIHN1Y2ggYXMgTGlzdCBVbi9TdWJzY3JpcHRpb24sCl8tPSBBcmNoaXZlIFNlYXJjaCAmIERv d25sb2FkLCA3LURheSBCcm93c2UsIENoYXQsIEZBUSwKXy09IFBob3Rvc2hhcmUsIGFuZCBtdWNo IG11Y2ggbW9yZToKXy09Cl8tPSAgIC0tPiBodHRwOi8vd3d3Lm1hdHJvbmljcy5jb20vTmF2aWdh dG9yP0Flcm9FbGVjdHJpYy1MaXN0Cl8tPQpfLT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PQpfLT0gICAgICAgICAgICAgICAtIE1BVFJP TklDUyBXRUIgRk9SVU1TIC0KXy09IFNhbWUgZ3JlYXQgY29udGVudCBhbHNvIGF2YWlsYWJsZSB2 aWEgdGhlIFdlYiBGb3J1bXMhCl8tPQpfLT0gICAtLT4gaHR0cDovL2ZvcnVtcy5tYXRyb25pY3Mu Y29tCl8tPQpfLT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PQpfLT0gICAgICAgICAgICAgIC0gTkVXIE1BVFJPTklDUyBMSVNUIFdJS0kg LQpfLT0gQWRkIHNvbWUgaW5mbyB0byB0aGUgTWF0cm9uaWNzIEVtYWlsIExpc3QgV2lraSEKXy09 ICAgLS0+IGh0dHA6Ly93aWtpLm1hdHJvbmljcy5jb20KXy09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT0KXy09ICAgICAgICAgICAgIC0g TGlzdCBDb250cmlidXRpb24gV2ViIFNpdGUgLQpfLT0gIFRoYW5rIHlvdSBmb3IgeW91ciBnZW5l cm91cyBzdXBwb3J0IQpfLT0gICAgICAgICAgICAgICAgICAgICAgICAgICAgICAtTWF0dCBEcmFs bGUsIExpc3QgQWRtaW4uCl8tPSAgIC0tPiBodHRwOi8vd3d3Lm1hdHJvbmljcy5jb20vY29udHJp YnV0aW9uCl8tPT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09CgoKCg= ________________________________ Message 4 _____________________________________ Time: 04:04:41 PM PST US From: "Robert L. Nuckolls, III" Subject: Re: AeroElectric-List: Re: do I need to change my capacitor At 02:44 PM 7/8/2016, you wrote: > >On another internet forum the question was posed - "Why do you need >a capacitor on the Rotax charging system?" A reply was posted by >another member: > >"In our charging systems, the stator produces AC output which goes >to the regulator/rectifier. The ouput of that is DC plus an AC >voltage on top of it. A capacitor is often used to filter out higher >frequency AC ripple on the rectified DC supply. It helps keep the >electronics happy and audio quiet." > >I'm curious if this is an accurate statement, or not. This statement and similar ones have been around for a long time. They have a 'ring of truth' about them. Everybody knows that capacitors are a hedge against noise. It's also common knowledge that the higher the noise frequency, the 'better' a capacitor works. This is a simplistic statement that is un- quantified (how high is high?) and just how does ripple on the bus figure into 'quiet audio systems'. I did some simple demonstrations with an SD-8 on B&C's bench about 20 years ago wherein I MEASURED the effects upon ripple voltage for both the battery and the legacy recommendation for a 'filter' capacitor. I was unable to support the notion that the capacitor was a useful addition to the system. It doesn't hurt anything but I'm unable to demonstrated that it helps anything either. The test-bench under construction will explore next generation options for PM dynamo rectifier/ regulators. It will also be instrumented adequately to explore answers to the capacitor question in more detail with a test report with measured data. But based on what I observed 20 years ago and since, I'm not a big proponent of adding fat caps to the bus. I may be wrong. If so, the REAL answer will be in somebody else's test report wherein it is demonstrated that some problem was mitigated by addition of a capacitor. But for now, my inclination is to suggest that the capacitor is equally effective in warding off meteor strikes. To the question in your subject line, what makes you think the capacitor is bad? Without evaluation on appropriate instruments, it's a rather enigmatic device. Of course, if it's all puffed up, leaking gooey stuff or smelling bad . . . well . . . yeah. The puppy has gone TU. Bob . . . ------------------------------------------------------------------------------------- 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.