> Alternatively since you only need 25mA @ +12V, 25mA @ -12V and 300mA > @+5V (if I'm reading the right datasheet) you can use a much lower > voltage output transformer suited to the 5V regulator and use a pair of > voltage doublers or triplers to feed your 12V regulators. > A 7.5- 0 - 7.5V transformer should suffice (if you use low dropout > linear regulators), and the total linear regulator dissipation should > only be a few watts in normal operation.
Bruce, The thunderbolt manual says 750 mA @ +12V, 400 mA @ +5V and 10 mA @ -12V. I also purchased from Aibin Guo a Mean Well. Model: T-30B power supply along with a thunderbolt (and I'm satisfied), but I'm planning to use a multitap transformer for positive voltages, and, for -12V, one of those switching miniature modules (less than inch sized) often used to generate rs232 +/-12V; I have some of them on surplus boards. I thing that the -12V serves only to the rs232 port on the thunderbolt. Just another idea. Antonio I8IOV _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
