<html><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div>Thanks Ken,</div><div id="yui_3_16_0_1_1443589664239_3021">you have a lot of parts to fit in there. </div><div id="yui_3_16_0_1_1443589664239_3021">Maybe you will need to stack the PCBs</div><div id="yui_3_16_0_1_1443589664239_3021">Good luck.</div><div id="yui_3_16_0_1_1443589664239_3021">Alan</div><br> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1443589664239_2945"> <div style="font-family: HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif; font-size: 16px;" id="yui_3_16_0_1_1443589664239_2944"> <div dir="ltr" id="yui_3_16_0_1_1443589664239_2943"> <hr size="1"> <font size="2" face="Arial" id="yui_3_16_0_1_1443589664239_2942"> <b><span style="font-weight:bold;">From:</span></b> Ken Martindale 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> Wednesday, September 30, 2015 9:16 AM<br> <b><span style="font-weight: bold;">Subject:</span></b> [PSUBS-MAILIST] LED Light 10,000 Lumens<br> </font> </div> <div class="y_msg_container" id="yui_3_16_0_1_1443589664239_2946"><br>If you go to the forums you can find the latest installment of the LED<br>driver schematics and parts list.<br><br>I found a few errors which I corrected and I changed the PWM IC to one I<br>have more confidence in.<br><br>I did not use a reverse polarity protect diode since I didn't want to throw<br>away the power in a diode so I used a FET as the reverse polarity protect<br>device. It cost about $0.80 more to do this.<br><br>The cost of the electrical parts is about $88 from Digikey including the<br>Varo 29 LED array. This is for a single unit and the parts cost goes down if<br>higher quantity. This does not include the PWB.<br><br>I have ordered the first kit of parts from Digikey today to help me in<br>laying out the PWB which is next. These parts will be used in the first<br>prototype. I should have an area study done by next week so we can start<br>firming up the mechanical packing and making it fit into the housing Cliff<br>has generated.<br><br>The design meets all but one of our original requirements as stated in the<br>spec we generated. Meeting the full EMI requirements of MIL-STD-461 would<br>require a large EMI Filter which in the interests of small size was modified<br>to accept a small EMI Filter, mostly common mode filtering. I think it will <br><br>have no problems in the Sub's electrical environment.<br><br>One of the things I'm interested in is to put the driver on a single<br>rectangular PWB so we could use the driver as a stand-alone driver internal<br>to the Sub so the LED array could be all that is packaged outside the<br><br>sub. It would require a 4 conductor cable to the LED array outside the sub.<br>That may be for the future, for now we are going with Cliff's housing. <br><br>Wish us luck,<br><br>Ken Martindale<br><br><br>_______________________________________________<br>Personal_Submersibles mailing list<br><a ymailto="mailto:Personal_Submersibles@psubs.org" href="mailto:Personal_Submersibles@psubs.org">Personal_Submersibles@psubs.org</a><br><a href="http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles" target="_blank">http://www.psubs.org/mailman/listinfo.cgi/personal_submersibles</a><br><br><br></div> </div> </div> </div></body></html>