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

[dan snazelle]

On Sep 20, 2012, at 5:51 PM, Ullrich Peter wrote:

> 
> Hi Dan!
> 
> What about using the comparator that outputs -12...+12V and adding a simple circuit like this:
> 
> 
>                                    diode
> from comparator   ------|>|------o-----/\/\/\------o---------- CMOS out (0V...5V)
>                                                                           |
>                                                                     Zenerdiode 4.7V parallel to 10k resistor
>                                                                           |
>                                                                           GND
> 





thanks guys

i had a feeling that a diode was going to be involved!!





> ________________________________________
> Von: synth-diy-bounces at dropmix.xs4all.nl [synth-diy-bounces at dropmix.xs4all.nl] im Auftrag von dan snazelle [subjectivity at hotmail.com]
> Gesendet: Donnerstag, 20. September 2012 23:47
> An: *SYNTH DIY
> Betreff: [sdiy] best way to convert bipolar to Cmos compatible square/gate?
> 
> 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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