[sdiy] In search of a reasonably precise comparator output

Pete Hartman pete.hartman at gmail.com
Wed Jun 20 18:02:00 CEST 2018

On Wed, Jun 20, 2018 at 10:30 AM, Lloyd Abbott <lloydabbott94 at gmail.com>

> What rails do you have available ? Have you considered a comparator IC
> (e.g. LM339) rather than using general purpose op-amps ?
> If you have 0V, +5V and +15V rails, with an LM339 you can reference the
> comparator input side to the 0V and +15V rails and have the output side
> referenced to 0V and +5V. The datasheet has an example circuit using one
> pullup resistor and one cap per comparator.

I was going to suggest this as well.  The 339 and its family are all open
collector outputs, so you can use a pull up to any voltage you like, a rail
or a reference voltage or whatever to get the swing you need and if
necessary convert levels.
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