Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Zeitgeist wrote: Not sure why tantalum was chosen over electrolytics, but here's my source article: IIRC, tantalum caps have a wider temperature range and narrower tolerances. (Electrolytics are usually no better than +/- 10%, with +20/-10% not being uncommon.) Electrolytics also have a limited life span -- eventually they dry out. Finally, they're less compact. All Electronics has tantalums, but I think they have a minimum order: http://www.allelectronics.com/cgi-bin/category/140800/Tantalum.html Digi-Key has been aggressively removing items from their catalog that contain heavy metals and toxic substances, so that's probably why you can't find them there. There's a big push in the electronics industry to use less toxic materials, especially in Europe, where companies are required to take devices back for recycling. http://www.benplace.com/vanagon_intermittent_syndrome.htm It looks like they're using the capacitor as a filter to shunt noise to ground. The value is probably non-critical. I'm not sure why they don't want you to use an electrolytic. This seems like a classic application for one. It may be the engine compartment is too hot for them. I always kind of suspected the underlying problem was that the mechanical AFMs would get worn spots where the signal would get noisy, kind of like a scratchy volume control. I never had a van with Vanagon syndrome, or I'd have attached an oscilloscope and found out.
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Not sure why tantalum was chosen over electrolytics, but here's my source article: http://www.benplace.com/vanagon_intermittent_syndrome.htm Maybe I can use an electrolytic, afterall... No engineering at all, in other words. Looks like the guy just grabbed the generic 'good capacitor' and it worked for him. No idea if it was the bulk capacitance it needed, or more high frequency noise shunting. I wouldn't want to use a regular electrolytic cap in a harsh environment, but I hate them anyway. But one of them in parallel with a decent .1 uF orange drop or something would work even better than the tantalum, most likely. The proper engineering fix involves finding out the failure mechanism, using an oscilloscope, etc., then putting in the right component to take care of it. That takes time, knowledge, and equipment that most people don't have though. Heck, in that application just try anything. It won't hurt! -- Jim
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
On Wed, 27 Sep 2006, Jim Cathey wrote: frequency noise shunting. I wouldn't want to use a regular electrolytic cap in a harsh environment, but I hate them anyway. But one of them in parallel with a decent .1 uF orange drop or something would work even better than the tantalum, most likely. I agree there, but OD's can get huge (thinking [EMAIL PROTECTED]) I recall that BC makes electrolytic caps rated for [EMAIL PROTECTED] (SAL-A 123?), since they are what I used on that CC amp. (most of them seem to be 65C rated). I think digi shows some tants still. The proper engineering fix involves finding out the failure mechanism, using an oscilloscope, etc., then putting in the right component to take care of it. That takes time, knowledge, and equipment that most people don't have though. Yeah *pats 7844,DC504,FG504...*. Since most of the electrolytics made 10+yrs ago had a rated life of 2Khrs or less, it is probabably a good bet that they are going bad... typically by leaking DC, but that takes a little setup to test. Heck, in that application just try anything. It won't hurt! Just beware old used caps since they can have nasty resistance properties. -j.
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
rumor has it that Zeitgeist wrote: I need to locate a 15 volt 22 microfarad tantalum capacitor, w/Part #. 15 TA 22. Radio shack doesn't seem to carry these, so I'd like to find a good online electronic components retailer. I intend to solder this unit into the airflow meter on my van, to clear up some erratic running conditions. Which online retailers do you folks use? Mouser Electronics http://www.mouser.com Good selection, fair prices, and no minimum order. *smile* --Philip, been a customer for 20 years
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
On Wed, 27 Sep 2006, Fmiser wrote: Mouser Electronics http://www.mouser.com Good selection, fair prices, and no minimum order. *smile* I think most tants have been discontinued. At least I cant find sprague/vishay anymore and the panasonics I used when I rebuilt a CC amp were discontinued (got a notice on that) Dunno if it was because of heavy metals or because normal electrolytics have improved vastly (Low ESR, better high-freq behavior, etc).. or superposition might just apply :) -j.
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Not sure why tantalum was chosen over electrolytics, but here's my source article: http://www.benplace.com/vanagon_intermittent_syndrome.htm Maybe I can use an electrolytic, afterall... On 9/27/06, John W. Reames III [EMAIL PROTECTED] wrote: I think most tants have been discontinued. At least I cant find sprague/vishay anymore and the panasonics I used when I rebuilt a CC amp were discontinued (got a notice on that) Dunno if it was because of heavy metals or because normal electrolytics have improved vastly (Low ESR, better high-freq behavior, etc).. or superposition might just apply :) Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Mouser electronics Peter
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
I need to locate a 15 volt 22 microfarad tantalum capacitor, Does it have to be tantalum? While common a few years ago they've largely disappeared. I know they were relatively expensive, probably due to the T, but worked well. They may have been somewhat toxic to make though. Also, they have a disturbing trait of sometimes catching fire, and they actually burn quite well. A tantalum cap can be installed reversed and survive for quite some time before burning up, it doesn't just happen at the factory. -- Jim
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
http://www.jdr.com/ but there is a $50 minimum. Check eBay. Anywhere online will kill you with shipping for a single piece. FYI - It's okay too use a higher voltage capacitor if you can find one local. Any TV repair shop that actually fixes things will have one close. Offer them a buck for one. -Dave Walton On 9/25/06, Zeitgeist [EMAIL PROTECTED] wrote: I need to locate a 15 volt 22 microfarad tantalum capacitor, w/Part #. 15 TA 22. Radio shack doesn't seem to carry these, so I'd like to find a good online electronic components retailer. I intend to solder this unit into the airflow meter on my van, to clear up some erratic running conditions. Which online retailers do you folks use? TIA Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Casey - Try Digikey. Barry Which online retailers do you folks use?
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Ya, apparently a 25 volt 22 microfarad capacitor will also work. Maybe I can scavenge one from some of my dead and dying electronic junkpile. On 9/25/06, dave walton [EMAIL PROTECTED] wrote: FYI - It's okay too use a higher voltage capacitor if you can find one local. Any TV repair shop that actually fixes things will have one close. Offer them a buck for one. - Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
www.mouser.com -- Luther KB5QHU Alma, Ark '83 300SD (236 kmi) '82 300CD (160 kmi) '82 300D (74 kmi) needs MAJOR work Quoting Zeitgeist [EMAIL PROTECTED]: I need to locate a 15 volt 22 microfarad tantalum capacitor, w/Part #. 15 TA 22. Radio shack doesn't seem to carry these, so I'd like to find a good online electronic components retailer. I intend to solder this unit into the airflow meter on my van, to clear up some erratic running conditions. Which online retailers do you folks use? TIA Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
If you don't find a new one, I have the following which were salvaged from various electronic units and were tested-good a couple of years ago. I've forgotten how to identify a tantalum capacitor: 5 22mfd 16v 10mm + 5mm and 7.5mm 2 22mfd 25v 13mm + 10mm 3 22mfd 25v 12mm + 5mm 1 22mfd 50v 11mm + 6mm I can retest to be sure they still hold a charge. Gerry '83 300D and 240D --- - Original Message - From: Barry Stark [EMAIL PROTECTED] Casey - Try Digikey. Barry Which online retailers do you folks use?
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Digikey is my favorite but Mouser is cheaper. Note if you call up some suppliers like Kemet they might send a free engineering sample kit. I have few of these laying around. Trampas -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Zeitgeist Sent: Monday, September 25, 2006 10:39 AM To: Mercedes Discussion List Subject: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor. I need to locate a 15 volt 22 microfarad tantalum capacitor, w/Part #. 15 TA 22. Radio shack doesn't seem to carry these, so I'd like to find a good online electronic components retailer. I intend to solder this unit into the airflow meter on my van, to clear up some erratic running conditions. Which online retailers do you folks use? TIA Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
Re: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor.
Casey, I wish you were closer. I need someone to fix the bridge rectifier in my battery charger. Tom Potter -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Zeitgeist Sent: Monday, September 25, 2006 9:39 AM To: Mercedes Discussion List Subject: [MBZ] OT: 15 volt 22 microfarad tantalum capacitor. I need to locate a 15 volt 22 microfarad tantalum capacitor, w/Part #. 15 TA 22. Radio shack doesn't seem to carry these, so I'd like to find a good online electronic components retailer. I intend to solder this unit into the airflow meter on my van, to clear up some erratic running conditions. Which online retailers do you folks use? TIA Casey Olympia, WA Biodiesel: I drive in a persistent vegetative state '87 300TD intercooler #22 (218k) '84 300D (216k) Gashuffer: '89 Vanagon Wolfsburg Edition (187K) http://users.zhonka.net/zeitgeist/Misc/IMG_0171.JPG ___ http://www.okiebenz.com For new parts see official list sponsor: http://www.buymbparts.com/ For used parts email [EMAIL PROTECTED] To Unsubscribe or change delivery options go to: http://okiebenz.com/mailman/listinfo/mercedes_okiebenz.com
