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<div>Alan, this circuit board does not have large capacitors, they are only about 3\16 in dia and same height. Anyways 3,000 psi = no problem.</div><div>Hank</div><div><br></div>
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On Sunday, April 15, 2018, 1:06:34 AM MDT, Alan via Personal_Submersibles <personal_submersibles@psubs.org> wrote:
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<div><div id="yiv3984626465"><div><div>Brian,</div><div id="yiv3984626465AppleMailSignature">most of the led drivers, motor controllers or buck / boost units have </div><div id="yiv3984626465AppleMailSignature">those large cylindrical electrolytic capacitors which can crush under </div><div id="yiv3984626465AppleMailSignature">pressure. At the top of them most have a cross cut in them to weaken </div><div id="yiv3984626465AppleMailSignature">them at that point so if they blow they blow in a controlled direction. </div><div id="yiv3984626465AppleMailSignature">They would be particularly weak at that point with regard to crushing. </div><div id="yiv3984626465AppleMailSignature"> I am not sure how the capacitor would operate once it was crushed;</div><div id="yiv3984626465AppleMailSignature">whether it wouldn't work at all, or partially work, & whether that would</div><div id="yiv3984626465AppleMailSignature">result in the circuits failure or just reduce the life of the circuit.</div><div id="yiv3984626465AppleMailSignature">I read about this on the Psub list & other web sites years ago, so they</div><div id="yiv3984626465AppleMailSignature">must have a history of failing under pressure.</div><div id="yiv3984626465AppleMailSignature">Alan</div><div id="yiv3984626465AppleMailSignature"><br clear="none"><br clear="none">Sent from my iPad</div><div class="yiv3984626465yqt5699886431" id="yiv3984626465yqt18159"><div><br clear="none">On 15/04/2018, at 6:34 PM, Brian Cox via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote type="cite"><div><div style="font-family:Arial, sans-serif;font-size:10pt;"><div>Alan, What type of capacitor is good under pressure ?</div><div> </div><div> </div><div>Brian</div><div> </div><div><br clear="none"><br clear="none">--- <a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> wrote:<br clear="none"><br clear="none">From: Alan via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">To: Personal Submersibles General Discussion <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>><br clear="none">Subject: Re: [PSUBS-MAILIST] pressure test<br clear="none">Date: Sun, 15 Apr 2018 14:07:17 +1200<br clear="none"><br clear="none"></div><div>Hank,</div><div>probably me advising caution about pressurising the LED drivers</div><div>as most I've seen have large electrolytic capacitors that can be</div><div>crushed under pressure. </div><div>Alan<br clear="none"><br clear="none">Sent from my iPad</div><div><br clear="none">On 15/04/2018, at 8:04 AM, hank pronk via Personal_Submersibles <<a rel="nofollow" shape="rect" ymailto="mailto:personal_submersibles@psubs.org" target="_blank" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"></div><blockquote><div><div style="font-family:Helvetica Neue, Helvetica, Arial, sans-serif;font-size:13px;"><div>Today I pressure tested my LED light circuit board to see if it can handle the pressures Scott's P6 will see. I am happy to report the circuit board survived one hr at 3,000 psi soaking in oil. I was very cautious, because I kept hearing Hugh yelling at me from NZ at least I think it was Hugh. I stayed in Gamma and the pressure chamber was under Gamma while I pressured it up. </div><div>Hank</div></div></div></blockquote><blockquote><div><span>_______________________________________________</span><br clear="none"><span>Personal_Submersibles mailing list</span><br clear="none"><span><a rel="nofollow" shape="rect" ymailto="mailto:Personal_Submersibles@psubs.org" target="_blank" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a></span><br clear="none"><span><a rel="nofollow" shape="rect" target="_blank" href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a></span><br clear="none"></div></blockquote>_______________________________________________
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