At 22:23 -0600 8/6/09, Sterling Jacobson wrote: >Do you have a good place to get the tantalum caps?
The ones I have came from DigiKey <http://digikey.com>, typical part number 495-1539-1-ND. They have just about everything but there are minimum order problems. Mine were purchased from them in reels of 1500 for automated assembly on other projects and It's not likely that you would want to do that. Jameco and All Electronics are worth a visit to their web sites. I believe all of the other capacitors, beside C6, are just distributed filters on the +12 or +5 volt power distribution system. Their capacitance values are not very critical and in general bigger is better. Tantalum caps have better high frequency performance than aluminum ones so effective series resistance is not anything to worry about. The aluminum caps that Apple used are all the same capacitance with a 16 volt rating. That probably made sense at the time for inventory purposes but the caps on the 5 volt line can be rated at 6.3 volts and the physical size and cost go down if you do that. The trick is to find caps that fit on the surface mount pads with access for a small soldering iron. Now you ask which caps are 5V and which are 12V. I'll get around to figuring that out right soon now. I'll start with an ohmmeter on a board from which the caps have been removed. Right soon now. . . Remember that electrolytic capacitors are polarity sensitive. They are labeled but sometimes one has to read the data sheet to figure out what the bar or the sloped corner means when the devices are tiny. If you have only one motherboard take a picture of it before you start cutting things off. Someone was advertising capacitor sets on this or perhaps another list. Archives are good. -- --> Halloween == Oct 31 == Dec 25 == Christmas <-- --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Vintage Macs group. The list FAQ is at http://lowendmac.com/lists/vintagemacs.shtml and our netiquette guide is at http://www.lowendmac.com/lists/netiquette.shtml To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/vintage-macs?hl=en Low End Mac RSS feed at feed://lowendmac.com/feed.xml -~----------~----~----~----~------~----~------~--~---
