MOTM

>...
>Looking at the Power Delay, it uses a 741, which is an antique, but
>afaik, you can still buy them.  Although, you should be able to
>replace it with a modern op-amp with the same pinout. ...

LM741s are readily available (and still in production, as far as I 
know). Note that the 741 is internally compensated, I think with 30 
pF. Many op amps require external compensation. This isn't at all 
hard to deal with, but you must deal with it.

Also, I've read that some circuits require the relatively low slew 
rate of the 741. I.e., using a high slew rate op amp in place of a 
741 can occasionally result is performance issues.
--
john


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