<div id="RTEContent">OK... I'll bite<br> <br> Most bypass caps fail shorted.<br> <br> (why?)<br> <br> If the cap fails open... you may not notice the failure if common<br> practice was followed and there are redundant bypass caps.<br> System performance might be degraded slightly, but the chance of<br> seeing it is slim.<br> <br> If it fails shorted, you will notice. Tantalums are famous for failing shorted <br> and burning. Ceramics seldom fail, but if they do they might not be as spectacuar<br> as the tantalum. Electrolytics usually vent, or explode.<br> <br> I can't remember ever seeing a ceramic bypass cap failure that was not initiated<br> by some other component failure. In fact I can't remember seeing a ceramic<br> fail, period. It can happen but I didn't see it.<br> <br> I heard of some 'bad batch of caps' that found their way into some production<br> synths at some time in history... but a defective batch should not posion!
<br> the
whole pool. OTOH, who would use SSS CMOS chips (after their history).<br> <br> H^) harry<br><br><b><i>Aaron Lanterman <lanterma@ece.gatech.edu></i></b> wrote:<blockquote class="replbq" style="border-left: 2px solid rgb(16, 16, 255); margin-left: 5px; padding-left: 5px;"> <br>I've been reading up the sage advice on bypass caps, and something started <br>to worry me...<br><br>When caps fail, do they fail into "open circuits" or "short circuits?"<br><br>If the later, it could be scary if the cap runs from the power supply to <br>ground...<br><br>- Aaron, working on the transition form theory to practice<br><br>-----------------------------------------------------------------------------<br><br>Dr. Aaron Lanterman, Asst. Prof. Voice: 404-385-2548<br>School of Electrical and Comp. Eng. Fax: 404-894-8363<br>Georgia Institute of Technology E-mail: lanterma@ece.gatech.edu<br>Mail Code 0250 Web:
users.ece.gatech.edu/~lanterma<br>Atlanta, GA 30332 Office: GCATT 334B<br><br><br><br><br><br></blockquote><br></div>