[sdiy] best way to convert bipolar to Cmos compatible square/gate?

[dan snazelle]

I have been trying all day to find a way to do this without too many parts.

gone through the cmos cookbook, still no luck.


basically I am trying to get square pulses from a bipolar waveform.

my first thought was, Oh, just feed it into a comparator with a threshold pot.
but that was putting out a square that went from -12v to +12v

so then i thought, ok I will use one opamp to change the gain, and one opamp to offset it.


but that made me think.....there must be a better way.



maybe diodes to a 5v supply?

or is there a CMOS compatible comparator that reads a bipolar input and puts out cmos compatible pulses?




THANKS FOR ANY HELP