Michael K Johnson via EV wrote:
Found an ebay listing for WRB4812S which has 36-72V input and 12V output. Bought it. Then re-read and found that it's a 1W part and the meter is listed at 2W.
Caution: A large majority of these small inexpensive DC/DC converters have really bad isolation. They may advertise "1000v" or so; but the fine print on the data sheet says things like "Isolation not guaranteed. Only sampled, all units are not tested. A one-time test, for one second. Designed to meet UL... (rather than actually meets UL)."
Get an extra one, and cut it open. 99% of the time, the isolation transformer is wound with enamelled magnet wire. The primary and secondary are directly on top of each other, with no supplemental insulation between them. Magnet wire insulation is only good for about 30vac continuous; so the primary and secondary are only insulated for 60vac continuous duty.
-- Anyone can make the simple complicated. Creativity is making the complicated simple. -- Charles Mingus -- Lee Hart's EV projects are at http://www.sunrise-ev.com/LeesEVs.htm _______________________________________________ UNSUBSCRIBE: http://www.evdl.org/help/index.html#usub http://lists.evdl.org/listinfo.cgi/ev-evdl.org For EV drag racing discussion, please use NEDRA (http://groups.yahoo.com/group/NEDRA)
