<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div id="yui_3_16_0_1_1435045722717_2762"><span id="yui_3_16_0_1_1435045722717_2761">I'd give it a go too Hank.</span></div><div id="yui_3_16_0_1_1435045722717_2762"><span id="yui_3_16_0_1_1435045722717_3341">I've been doing a bit more Googling & can't find any specifics on capacitor</span></div><div id="yui_3_16_0_1_1435045722717_2762"><span id="yui_3_16_0_1_1435045722717_3340">pressure limits. Found this on an electronics forum. It may be of interest</span></div><div id="yui_3_16_0_1_1435045722717_2762" dir="ltr"><span id="yui_3_16_0_1_1435045722717_3456">to Ken in his led light driver design.</span></div><div id="yui_3_16_0_1_1435045722717_2762" dir="ltr"><span>Alan</span></div><div style="margin-top: 5px; margin-bottom: 5px; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" class="" id="yui_3_16_0_1_1435045722717_3573">It's kind of funny reading these posts looking for advice for pressure tolerant electronics.. It seemed like such an esoteric concern when I started designing electronics for ROVs. I didn't think that there would be many other people out there looking for this information.</div><div style="margin-top: 5px; margin-bottom: 5px; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" class="" id="yui_3_16_0_1_1435045722717_3572">Our electrical systems are routinely tested to 10.5kPSI (5000m+ some safety factor), and we really don't have too many issues with component failures (due to pressure). That being said, we do not use a handful of different types of components:</div><ol style="margin: 10px 2em; list-style-position: outside; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" id="yui_3_16_0_1_1435045722717_3557" class=""><li class="" style="" id="yui_3_16_0_1_1435045722717_3571">Electrolytic capacitors</li><li class="" style="" id="yui_3_16_0_1_1435045722717_3570">Tantalum capacitors</li><li id="yui_3_16_0_1_1435045722717_3556" class="" style="">Hermetically sealed components.</li><li class="" style="" id="yui_3_16_0_1_1435045722717_3670">Most metal can oscillators/crystals.</li><li class="" style="" id="yui_3_16_0_1_1435045722717_3671">PVC insulated wire if in an oil compensated housing.</li><li class="" style="" id="yui_3_16_0_1_1435045722717_3672">If critical, ferrite materials seem to exhibit fairly large changes with respect to pressure.</li></ol><div style="margin-top: 5px; margin-bottom: 5px; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" class="" id="yui_3_16_0_1_1435045722717_3673">Other than that, most components work just fine. There are a few special cases where we cannot design out large bulk capacitance, specifically for motor control, where our electronic housings require special 1 ATM pockets where we seal special components.</div><div style="margin-top: 5px; margin-bottom: 5px; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" class="" id="yui_3_16_0_1_1435045722717_3674">I have also had luck using MEMS oscillators in pressures below 5kPSI. Above that, we have had some failures. It's usually worth taking your final product to a pressure chamber and electronically monitoring it while it is operating at pressure, just to look for any sneaky issues.</div><div style="margin-top: 5px; margin-bottom: 5px; font-family: Helvetica, 'Helvetica Neue', Arial, sans-serif; font-size: small;" dir="ltr" class="">Let me know if you have any more specific questions too. I'll see if I can answer them for you.</div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1435045722717_2645"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1435045722717_2644"> <div dir="ltr" id="yui_3_16_0_1_1435045722717_2643"> <hr size="1" id="yui_3_16_0_1_1435045722717_2661"> <font size="2" face="Arial" id="yui_3_16_0_1_1435045722717_2642"> <b id="yui_3_16_0_1_1435045722717_3339"><span style="font-weight:bold;" id="yui_3_16_0_1_1435045722717_3338">From:</span></b> hank pronk via Personal_Submersibles <personal_submersibles@psubs.org><br> <b><span style="font-weight: bold;">To:</span></b> Personal Submersibles General Discussion <personal_submersibles@psubs.org> <br> <b><span style="font-weight: bold;">Sent:</span></b> Tuesday, June 23, 2015 3:08 PM<br> <b id="yui_3_16_0_1_1435045722717_3358"><span style="font-weight: bold;" id="yui_3_16_0_1_1435045722717_3357">Subject:</span></b> Re: [PSUBS-MAILIST] Fw: Amazon.com: Ebotrade-tech 42" 240w LED Off Road Light Bar Spot Flood Beam Work Light 4wd Boat Pickup Truck: Automotive<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1435045722717_2662"><br><br clear="none">Alan,<br clear="none">I think for the cost it is a worth while experiment.<br clear="none">Hank--------------------------------------------<br clear="none">On Mon, 6/22/15, Alan James via Personal_Submersibles <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1435045722717_3360">personal_submersibles@psubs.org</a>> wrote:<br clear="none"><br clear="none"> Subject: Re: [PSUBS-MAILIST] Fw: Amazon.com: Ebotrade-tech 42" 240w LED Off Road Light Bar Spot Flood Beam Work Light 4wd Boat Pickup Truck: Automotive<br clear="none"> To: "Personal Submersibles General Discussion" <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1435045722717_2663">personal_submersibles@psubs.org</a>><br clear="none"> Received: Monday, June 22, 2015, 9:24 PM<br clear="none"> <br clear="none"> Hank, I<br clear="none"> found this pic of a light bar being pulled<br clear="none"> apart.Looks like<br clear="none"> an impossible task potting the capacitors in this<br clear="none"> case.Who knows<br clear="none"> what pressure they will take.On the<br clear="none"> positve side, from the link it looks like you have a 2<br clear="none"> year Warantee :)Alan <br clear="none"> <br clear="none"> From: hank pronk via<br clear="none"> Personal_Submersibles<br clear="none"> <<a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org" id="yui_3_16_0_1_1435045722717_3359">personal_submersibles@psubs.org</a>><br clear="none"> <br clear="none"> To:<br clear="none"> <a shape="rect" ymailto="mailto:personal_submersibles@psubs.org" href="mailto:personal_submersibles@psubs.org">personal_submersibles@psubs.org</a> <br clear="none"> Sent: Tuesday, June 23,<br clear="none"> 2015 11:43 AM<br clear="none"> Subject:<br clear="none"> [PSUBS-MAILIST] Fw: Amazon.com: Ebotrade-tech 42" 240w<br clear="none"> LED Off Road Light Bar Spot Flood Beam Work Light 4wd Boat<br clear="none"> Pickup Truck: Automotive<br clear="none"> <br clear="none"> <br clear="none"> <br clear="none"> Jon,<br clear="none"> This is<br clear="none"> the light bar on Amazon<br clear="none"> Hank<br clear="none"> --- On Mon, 6/22/15, hank pronk <<a shape="rect" ymailto="mailto:hankpronk@live.ca" href="mailto:hankpronk@live.ca">hankpronk@live.ca</a>><br clear="none"> wrote:<br clear="none"> <br clear="none"> > From: hank<br clear="none"> pronk <<a shape="rect" ymailto="mailto:hankpronk@live.ca" href="mailto:hankpronk@live.ca">hankpronk@live.ca</a>><br clear="none"> > Subject: Amazon.com: Ebotrade-tech<br clear="none"> 42" 240w LED Off Road Light Bar Spot Flood Beam Work<br clear="none"> Light 4wd Boat Pickup Truck: Automotive<br clear="none"> ><br clear="none"> To: "<a shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca" href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>"<br clear="none"> <<a shape="rect" ymailto="mailto:hanker_20032000@yahoo.ca" href="mailto:hanker_20032000@yahoo.ca">hanker_20032000@yahoo.ca</a>><br clear="none"> > Received: Monday, June 22, 2015, 7:42<br clear="none"> PM<br clear="none"> > <br clear="none"> > <br clear="none"> > <br clear="none"> > <a shape="rect" href="http://www.amazon.com/Ebotrade-tech-Light-Flood-Pickup-Truck/dp/B00FWOKMI4/ref=sr_1_49?s=automotive" target="_blank">http://www.amazon.com/Ebotrade-tech-Light-Flood-Pickup-Truck/dp/B00FWOKMI4/ref=sr_1_49?s=automotive</a><br clear="none"> > <br clear="none"> <br clear="none"> > <br clear="none"> _______________________________________________<br clear="none"> 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