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

[Ove Ridé]

Connect the output of the comparator to a resistor + 4.7V Zener diode
("backwards") to ground. I believe the Zener should limit the voltage
in both directions. If not, also add a 1n4148 or similar to ground
(also "backwards") to limit negative swing.

On 20 September 2012 23:47, dan snazelle <subjectivity at hotmail.com> wrote:
> 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
>
>
>
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-- 
/Ove

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