On Tue, 9 Feb 2010, peter green wrote:
> The last time I needed to do high side swtiching of a voltage higher
> than the pics supply (though neither the voltage or the current was all
> that high current arround 150ma voltage arround 10-15V) I used a circuit
> with two bipolar transistors one NPN one PNP (the transistors I used
> were a 2N3904 and a 2N3906 but the circuit should work with pretty much
> any bipolar transistors). A small schematic is attatched.

Thanks for the post and formulea.  That will work for doing some level
shifting of clock and data lines to a higher voltage IC.  It's a lot
of parts and soldering if I wanted to make 50 of them though.

I wish PCB's were not such a pain to make.  SMD parts are good but
difficult to work with.  I like prototyping, not finishing things. :-)

--
Ian Smith
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