Lpc2000

On Sun, Feb 01, 2004 at 06:15:29PM -0000, leon_heller wrote:
> I've just traced through the circuit of the Wiggler, simplified it (I
> didn't see why it needed two buffers in series on most of the signals)
> and put it into my PCB package as a schematic. I've uploaded it as a
> PDF file, if anyone cares to check it.

Don't you have to put the resistors between the parallel port and the
buffer? The buffer gets its power from the target board which is 3.3V.
As far as I know PC parallel ports are still running at 5V, at least
older ones. The AC244 does have the usual input protection diodes, so
I think you need current limiting resistors between PC and buffer.

Or is there some kind of magic going on which I don't understand?

Soeren