<html xmlns="http://www.w3.org/1999/xhtml" xmlns:v="urn:schemas-microsoft-com:vml" xmlns:o="urn:schemas-microsoft-com:office:office"><head><!--[if gte mso 9]><xml><o:OfficeDocumentSettings><o:AllowPNG/><o:PixelsPerInch>96</o:PixelsPerInch></o:OfficeDocumentSettings></xml><![endif]--></head><body><div style="color:#000; background-color:#fff; font-family:HelveticaNeue, Helvetica Neue, Helvetica, Arial, Lucida Grande, sans-serif;font-size:16px"><div> In case any one has come across one, </div><div>I am looking for a DC/DC step down (buck driver) module with constant current adjustment.</div><div>I need to drop the voltage from 50V input to 32-36 to drive my LEDs.</div><div id="yui_3_16_0_ym19_1_1464516854466_2377">There is this module...</div><div id="yui_3_16_0_ym19_1_1464516854466_2378" dir="ltr"><a class="enhancr2_f0e80f8e-364a-4ec8-2fa7-378e6b3d0f23" id="yui_3_16_0_ym19_1_1464516854466_2382" href="http://www.dx.com/p/zxy6005-2-6-dc-dc-60v-constant-voltage-current-regulated-power-supply-module-green-151115#.V0qbnpF96Uk">ZXY6005 2.6" DC~DC 60V Constant Voltage Current Regulated Power Supply Module - Green</a></div><div><br></div><div class="yahoo-link-enhancr-card ymail-preserve-class ymail-preserve-style img-overlay-selected" id="enhancr2_f0e80f8e-364a-4ec8-2fa7-378e6b3d0f23" style='font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; max-width: 400px;' dir="ltr" contenteditable="false" data-size="medium" data-type="yenhancr" data-embed-url="" data-category="product" data-url="http://www.dx.com/p/zxy6005-2-6-dc-dc-60v-constant-voltage-current-regulated-power-supply-module-green-151115#.V0qbnpF96Uk"> <a class="yahoo-enhancr-cardlink" id="yui_3_16_0_ym19_1_1464516854466_2403" style="color: rgb(0, 0, 0) !important; text-decoration: none !important;" href="http://www.dx.com/p/zxy6005-2-6-dc-dc-60v-constant-voltage-current-regulated-power-supply-module-green-151115#.V0qbnpF96Uk" target="_blank" rel="noreferrer"> <table class="card-wrapper yahoo-ignore-table" id="yui_3_16_0_ym19_1_1464516854466_2402" style="max-width: 400px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yui_3_16_0_ym19_1_1464516854466_2401"><tr id="yui_3_16_0_ym19_1_1464516854466_2400"> <td width="400" id="yui_3_16_0_ym19_1_1464516854466_2399"> <table width="100%" class="card yahoo-ignore-table" id="yui_3_16_0_ym19_1_1464516854466_2398" style="max-width: 400px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yui_3_16_0_ym19_1_1464516854466_2397"><tr id="yui_3_16_0_ym19_1_1464516854466_2396"> <td class="card-primary-image-cell" id="yui_3_16_0_ym19_1_1464516854466_2395" background="https://s.yimg.com/vv//api/res/1.2/V3XOP32kLvVSwfIxaR_inQ--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://img.dxcdn.com/productimages/sku_151115_1.jpg.cf.jpg" valign="top" style='background: url("https://s.yimg.com/vv//api/res/1.2/V3XOP32kLvVSwfIxaR_inQ--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://img.dxcdn.com/productimages/sku_151115_1.jpg.cf.jpg") no-repeat center / cover rgb(0, 0, 0); height: 200px; position: relative;' bgcolor="#000000"> <!--[if gte mso 9]><v:rect fill="true" stroke="false" style="width:400px;height:218px;position:absolute;top:0;left:0;"><v:fill type="frame" color="#000000" src="https://s.yimg.com/vv//api/res/1.2/V3XOP32kLvVSwfIxaR_inQ--/YXBwaWQ9bWFpbDtmaT1maWxsO2g9MjAwO3c9NDAw/http://img.dxcdn.com/productimages/sku_151115_1.jpg.cf.jpg"/></v:rect><![endif]--> <table class="yahoo-ignore-table" id="yui_3_16_0_ym19_1_1464516854466_2394" style="width: 100%;" border="0" cellspacing="0" cellpadding="0" valign="top"> <tbody id="yui_3_16_0_ym19_1_1464516854466_2393"><tr id="yui_3_16_0_ym19_1_1464516854466_2392"> <td id="yui_3_16_0_ym19_1_1464516854466_2391" background="https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png" valign="top" style='background: url("https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png") left top; height: 200px;' bgcolor="transparent"> <!--[if gte mso 9]><v:rect fill="true" stroke="false" style="width:400px;height:218px;position:absolute;top:-18px;left:0;"><v:fill type="pattern" color="#000000" src="https://s.yimg.com/nq/storm/assets/enhancrV2/12/overlay-tile.png"/><v:textbox inset="0,0,20px,0"><![endif]--> <table height="185" class="yahoo-ignore-table" id="yui_3_16_0_ym19_1_1464516854466_2390" style="width: 100%; height: 185px; min-height: 185px;"> <tbody id="yui_3_16_0_ym19_1_1464516854466_2389"><tr id="yui_3_16_0_ym19_1_1464516854466_2388"> <td class="card-richInfo2" id="yui_3_16_0_ym19_1_1464516854466_2387" style="padding: 15px 0px 0px 15px; text-align: left; vertical-align: top;"> <span style="color: rgb(255, 255, 255); font-size: 18px; font-weight: bold;"> $ 46.19 </span> </td> <td class="card-actions" id="yui_3_16_0_ym19_1_1464516854466_2465" style="padding: 15px 15px 0px 0px; text-align: right; vertical-align: top;"> <div class="card-share-container"></div> </td> </tr> </tbody></table> <!--[if gte mso 9]></v:textbox></v:rect><![endif]--> </td> </tr> </tbody></table> </td> </tr> <tr id="yui_3_16_0_ym19_1_1464516854466_2410"> <td id="yui_3_16_0_ym19_1_1464516854466_2409"> <table align="center" class="card-info yahoo-ignore-table" id="yui_3_16_0_ym19_1_1464516854466_2414" style="background: rgb(255, 255, 255); border-width: 1px 1px 3px; border-style: solid; border-color: rgb(224, 228, 233) rgb(224, 228, 233) rgb(0, 0, 0); border-image: none; width: 95%; margin-top: -40px; margin-right: auto; margin-left: auto; position: relative; z-index: 2; max-width: 380px;" border="0" cellspacing="0" cellpadding="0"> <tbody id="yui_3_16_0_ym19_1_1464516854466_2413"><tr id="yui_3_16_0_ym19_1_1464516854466_2412"> <td style="padding: 16px 0px 16px 12px; vertical-align: top; background-color: rgb(255, 255, 255);"> </td> <td style="padding: 16px 12px; width: 99%; vertical-align: middle;"> <h2 class="card-title" style='margin: 0px 0px 4px; line-height: 19px; font-family: "Helvetica Neue", Helvetica, Arial, sans-serif; font-size: 16px;'>ZXY6005 2.6" DC~DC 60V Constant Voltage Current Regulated Power Supply...</h2> <div class="card-description" style="color: rgb(153, 153, 153); line-height: 15px; font-size: 11px;">I like this from DX. Find the cool gadgets at a incredibly low price with worldwide free shipping here.</div> </td> <td id="yui_3_16_0_ym19_1_1464516854466_2411" style="padding: 16px 12px 16px 0px; text-align: right;"> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </td> </tr> </tbody></table> </a></div><div id="yui_3_16_0_ym19_1_1464516854466_2449" dir="ltr">it will do what I want, but is a bit big & expensive. One option is to buy a couple of these &</div><div id="yui_3_16_0_ym19_1_1464516854466_2451" dir="ltr">just use the voltage step down function & run a number of smaller constant current drivers off it.</div><div id="yui_3_16_0_ym19_1_1464516854466_2495" dir="ltr">For anyone running 36V, there are a heap of cheap constant current drivers & LEDs in that</div><div id="yui_3_16_0_ym19_1_1464516854466_2487" dir="ltr">range to make up cheap & powerful lights.</div><div id="yui_3_16_0_ym19_1_1464516854466_2486" dir="ltr">Alan<br></div></div></body></html>