[sdiy] 748 replacement??

[Aaron Lanterman]

On Aug 14, 2009, at 3:24 PM, Dan Snazelle wrote:
>
>
> in electronotes I often run into old chips
>
> I often see the 748 being used.
>
> can i replace this with either
>
> a. any modern comparator?  like a 339? 311?

Uhhh you wanna be careful there. Dedicated comparators usually don't  
work like usual op amps - they usually have some sort of open  
collector output, needing a pull up-down-whatever resistor. In  
principle, the answer to your question is usually yes, but the circuit  
would probably need to be modified.

- Aaron