Electronics question. specifically a circuit.

[techy101]

I was wondering if anyone who has a bit more of a history in electronic engineering might be able to verify for me that this circuit would work fine being bumped up to 9V. The relay would be replaced with a 12V version.

I tried a comparator circuit for this application, but couldn't seem to get it to work. So I figured I'd try something a tad more simple for this. It'll get the job done just the same.

Here's a link to the circuit diagram.
http://www.uoguelph.ca/%7Eantoon/circ/actrelay.htm


Thanks,
Matthew