[sdiy] comparators vs. clamping diodes as gate inputs to microprocessor?

[Chris Muir]

On Nov 5, 2009, at 10:24 AM, Danjel van Tijn wrote:

> Anyone have thoughts on this? Most of the solutions I have seen
> involve using comparators but Seb's clamp diode inputs (on his
> website) look like a  nice and simple solution (and cheap).

A comparator can be pretty bulletproof. As I mentioned last time this  
came up, the LM339 works really well for this because it's open  
collector. You can pull it up to whatever your logic level is. It also  
doesn't care how sharp your input is, it becomes really snappy on the  
output.

- C

Chris Muir
cbm at well.com	
http://www.xfade.com