Dear David, I have no recipe for your thunderbolt powersupply, but the Ebay power supply you mention is not a linear power supply but a switching power supply!
I have two Thunderbolts however, these boards came from Telecom and have a 48V switcher built in. So I use them in the same way as I use my Z3801. As a suggestion for your power supply: You could consider using multiple transformers. One for each voltage. This will lower the dissipation, certainly for the low 5V voltage. Good luck, Jeroen David C. Partridge schreef: > I'm in the process of buying a Thunderbolt, and will need to provide it with > some volts. > > I sat down over the weekend to design a linear supply for it. Initially > things looked OK using a 12-0-12 transformer, and a few IC voltage > regulators, but then I did some worst case design and dissipation analysis, > and found that I needed to use a 15-0-15 transformer to allow for a -10% > mains variation, and add pass transistors and lots of heat sinking to all > the regulators to allow for a +10% mains variation. > > Add to that transformer regulation issues (over-size transformer), the time > to design the PCB and the cost of getting it made, and things started to > look expensive :-(. > > I can probably source a linear supply on eBay, but these are typically > pretty large and heavy. For example: eBay item number 330201077319 > > So is it reasonable to use an SMPS, and add additional filtering to the > output? Typically these talk in terms on 150mV ripple & noise which I need > to reduce by a factor of ten or better. > > If you have been there, done that, I'd be interested to hear what you did. > > Thanks > Dave Partridge > > > _______________________________________________ > time-nuts mailing list -- [email protected] > To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts > and follow the instructions there. > > > -- Ing. Jeroen Bastemeijer Delft University of Technology Department of Electrical Engineering Electronic Instrumentation Laboratory Mekelweg 4, Room 13.090 2628 CD Delft The Netherlands Phone: +31.15.27.86542 Fax: +31.15.27.85755 E-mail: [EMAIL PROTECTED] GPS: Lat N52.00002 Lon E4.37157 Alt 46.2m _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
