gEDA-user: another I/O port idea

[DJ Delorie]

"John Luciani" <jluciani at gmail.com> writes:
> Why couldn't you replace the diodes with shorts and use BJT's rather than
> MOSFETs?

I prototyped a circuit with one NPN and one PNP transistor, with an
LED/resistor between their collectors.  With even a 1M resistor
between the bases (and no other connection on the base side), enough
current flowed to light the LED.

I tried a couple of other variations; none seemed to do what I wanted.
Any kind of connection between the bases caused each transistor to
bias the other.