Infinity crossover coil value
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From: Bob Urz on 22 Jan 2007 10:10 GregS wrote: > In article <1169253079_9287(a)sp6iad.superfeed.net>, sound(a)inetnebr.com wrote: > >>I had a customer bring in an Infinity KPX00 crossover for a 6.5" car >>unit. Coil L2 has burnt marks on it, Its a 24db linkquitz riley filter >>(or so the spec sheet says). >>Customer claims low tweeter output >> >>http://manuals.harman.com/INF/CAR/Owner's%20Manual/KAPPA%20PERFECT%206-1%20om.p >>df >> >>in: >>(+) >>-------| >> | >> == C=15.7ufd >> | C=14ufd R=(1,2,4) OUTPUT >> |------------][------------/\/\/\/\/\------| >> > | >> >L2 (burnt) | >> > * >>(tweeter) >> | * >> | | >>------------------------------------------------ >>(-) (-) >> >>So, the input is a series cap inductor combination with a 15.7 MFD and >>unknown coil in series with the amp. The center tap of the two feeds a >>14MFD cap and then goes through a series resistor adjustable pad >>to the tweeter. I tried to read the coil on my sencore, and it measures >>about .3 MH. It won't pass any ring test (air core) so i know turns are >>shorted and this value is suspect. Any clue on the value of this coil? >> >>Strange, this seems to be a 3rd order filter rather than what the tear >>sheets says. >>Only one coil on the high pass with two caps. >>Minus the pad, it looks like the 3rd order 18 DB filter here: >> >>http://www.apicsllc.com/apics/Misc/filter2.html >> >>and these calculated 3500hz values are (4 ohm nominal) >>C=7.5 ufd >>L=0.1364 mh >>C2=22.7 >> >>standard replacement coil values are .1,.13,.15,.20,.27,.33 and etc. >> >>Thoughts? >> >>Bob > > > Plugging in the values, I seem to get slightly higher values of L1. > but not much. A crossover cannot be tested by itself. The > drivers also play into the crossover, also making poles and things. > I would try some real time values and listening test. the value should be > between .3 and .5 mh. If you could measure the R, unwind the coil, > and measure R, that might tell the extent of the damage. > > greg The link i provided was found with a quick search. I am guessing its that topology. Some of the information seems to be conflicting. What do you mean by measure R with the coil wound and unwound? Bob ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: Eeyore on 22 Jan 2007 10:27 Arny Krueger wrote: > You've got to remember that Bob is a disciple of the inestimable Phildo and > George Is he ? I thought he was smarter than that but I don't see his posts here since Supernews filter his posts. Graham
From: Bob Urz on 22 Jan 2007 10:35 Eeyore wrote: > > Arny Krueger wrote: > > >>You've got to remember that Bob is a disciple of the inestimable Phildo and >>George > > > Is he ? > > I thought he was smarter than that but I don't see his posts here since > Supernews filter his posts. > > Graham > Supernews filter my posts? Interesting. Check google groups for a recap. Is all about a crossover coil value question if you would like to help Graham. If you believe Arny, i got some swamp land......... ;) Bob ----== Posted via Newsfeeds.Com - Unlimited-Unrestricted-Secure Usenet News==---- http://www.newsfeeds.com The #1 Newsgroup Service in the World! 120,000+ Newsgroups ----= East and West-Coast Server Farms - Total Privacy via Encryption =----
From: Arny Krueger on 22 Jan 2007 10:53 "Bob Urz" <sound(a)inetnebr.com> wrote in message news:1169473753_4717(a)sp6iad.superfeed.net > Arny Krueger wrote: > >> "Bob Urz" <sound(a)inetnebr.com> wrote in message >> news:1169434331_1227(a)sp6iad.superfeed.net >> >>> Arny Krueger wrote: >>> >>>> "Bob Urz" <sound(a)inetnebr.com> wrote in message >>>> news:1169431172_935(a)sp6iad.superfeed.net >>>> >>>> >>>>> Arny Krueger wrote: >>>>> >>>>> >>>>>> "Bob Urz" <sound(a)inetnebr.com> wrote in message >>>>>> news:1169311899_13943(a)sp6iad.superfeed.net >>>>>> >>>>>> >>>>>> >>>>>>> Arny Krueger wrote: >>>>>>> >>>>>>> >>>>>>> >>>>>>>> "BOB Urz" <"sound"@(remove) inetnebr.com> wrote in >>>>>>>> message news:1169270006_10549(a)sp6iad.superfeed.net >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>> >>>>>>>>> When i can get no rings out of them on the >>>>>>>>> sencore, you can about guarantee some turns are >>>>>>>>> shorted. >>>>>>>> >>>>>>>> >>>>>>>> That appears to be self-contradictory. >>>>>>>> >>>>>>>> Are you trying to saythat even though the coils >>>>>>>> pass a shorted-turn test, you still think they are >>>>>>>> too far gone to be worth measuring? >>>>>> >>>>>> >>>>>>> You DON'T understand Arny. >>>>>> >>>>>> >>>>>> Right Bob I can't read your mind. You wrote a post >>>>>> in a way that would only be meaningful to someone >>>>>> who had experience with a specific piece of fairly >>>>>> esoteric test equipment. >>>> >>>> >>>>> Well , lets see. I said i got no rings, and that about >>>>> guarantees a shorted turns. You (who obviously doesn't >>>>> know about ringers), says it appears to be >>>>> contradictory. So, you obviously thought you knew >>>>> something about ringers to make your statement "that >>>>> appears to be self contradictory". >>>> >>>> >>>> I know that this will make your day Bob, but I've never >>>> heard of a shorted-turn tester called a ringer. I said >>>> that the usage appeared to be contrdictory for that >>>> reason. Therefore your claim that I thought I knew >>>> what a ringer was is completely false. >>>> >>>> >>>> >>>> >>>>> If you did no know >>>>> what a ringer or ring test on a coil was, goggle was a >>>>> few key strokes away. >>>> >>>> >>>> I just googled "ringer shorted turn" and nothing >>>> popped up that was obviously relevant in the first few pages. >>>> >>>> Ditto for "ring test". >>>> >>>> >>>> >>> >>> Humm Arny, your not as smart as i thought. >>> >>> Google Marco search: >>> terms( coil ring test) >>> Results 11 - 20 of about 1,190,000 for coil ring test. >> >> >> Not what I said. I introduced a concept that seems >> foreign to you Bob - hits that are actually relevant to >> the topic. By citing all these irrelevant hits, you're showing that >> you can't determine relevance of the hits received to >> your own topic. > Ok Arny. Your a smart guy RIght? You have used google > before right? And you know how to search for topics? > > With the words "coil ring sencore", here are the hits (in > order) As usual Bob, you're being deceptive. I wasn't talking about the search string "coil ring sencore". If I didn't know anything about this type of equipment, how would I know that Sencore would be a relevant word to use for searching google? One other helpful tip for you Bob. I've repaired a lot of computers, radars, and audio equipment, both pro and consumer. But, I've never ever fixed a TV other than checking the tubes and replacing the ones that checked bad.
From: Arny Krueger on 22 Jan 2007 10:57
"Speedskater" <grafkc(a)cox.net> wrote in message news:z34th.14384$8U4.3926(a)newsfe20.lga > Bob, if in your first usage, you had said "using the > Sencore ring test" we would not be having this > discussion. Exactly. > I think of a Sencore as an old multi-meter. One finds a lot of Sencore equipment in TV repair shops. I last spent any time at all in a TV repair shop before I graduated from high school. > I had no idea that Sencore had a special coil test. If I sat down and thought about it for a while, I'd figure out that Sencore did have a flyback transformer tester in their product line, and that it should have a shorted turn detector in it. > To me rings out is an old telephone term. Agreed. It also has meaning in the context of live sound which is yet another area where Bob likes to pretend that I'm an idiot. |