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                -----Original Message-----
                From:   Thomas C. Sefranek [mailto:tcs@CMCORP.COM]
                Sent:   Friday, January 14, 2000 5:09 AM
                To:     PICLIST@MITVMA.MIT.EDU
                Subject:        Re: +5 -5V Supply voltage

                Serge Marchal wrote:

                > Hi All...
                >
                > I need for a project to convert from a 9V battery
                > to a +5 -5 voltage, and consume the least current

                Well, how much current does your load require?
                (At +/- 5 volts?)

                > My  question is:
                > Should I use a regulator and how can I generate a negative
voltage
                > from a regulator

                Does you load REQUIRE regulated voltage?
                A regulator does not generate voltage, it REGULATES an
unregulated
                source.

                You need a switching converter.
                For low currents a capacitive converter is sufficient.
                For higher currents an inductive element is required.
                Losses in the converter will be reflected as additional
current demand
                on the 9 volt supply.

                > Any ideas ?
                >
                > Thanks
                > serge.

                --
                Thomas C. Sefranek  WA1RHP
                ARRL Instructor, Technical Specialist, VE Contact.
                http://www.harvardrepeater.org
                http://hamradio.cmcorp.com/inventory/Inventory.html