On Mon, 2010-03-15 at 11:31 +0100, ulf kypke wrote:

> i'm still looking for a very good 3.3v serial adapter, the prolific is
> not the best one.

Best trick is to cascade a MAX3232 level shifter with 3V3 power supply.
It will raise the signal level to just over 5V. That is enough for the
average serial-to-USB converter. It also protects the other end from
over voltage.

I once had to couple an AVR32 development board to an automotive GSM
modem using a bi-directional cascade of 3V3 and 5V powered MAX3232 level
shifters...

Bas.

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