In my never ending quest to develop a robust and easy to build power supply for my mobile MP3 player, I've come across an interesting Lucent DC/DC converter from All electronics (www.allelectronics.com). The only problem is that the part requires 36-72V DC at about 1 amp for input. I've scoured the web for a useful boost setup, but every design I've seen that uses a regular transformer complains of very poor conversion efficiency. It's becoming clear from my readings that a flyback transformer setup is required to get efficient operation. However it's not clear how to obtain such a beast. The supply houses generally carry ordinary step down transformers. So any suggestions? The output doesn't require any rigid regulation, just the ability to provide 1A at about 40V or so. BAJ -- http://www.piclist.com#nomail Going offline? Don't AutoReply us! email listserv@mitvma.mit.edu with SET PICList DIGEST in the body