On Sun, 26 May 2002, Jinx wrote:

>> to be more specific : it's the ultrasonic receiver part. the original
>> use 2 741's.
>
>40kHz ? You will be OK for gain / bandwidth with 1458 if the
>original works with 741s. 741s are veteran op-amps with not
>great specs compared to today's devices and any general
>purpose op-amp / comparator you can pick off the shelf will
>sub for a 741. I'm guessing one 741 is used as an amp and
>the other as a comparator. You can check out the bandwidth
>(gain vs frequecy) figures for common op-amps - you'll find
>they equal or better the 741. A 1458 should equal it

The 741 could be used with phase lead feedback and it could outspeed a
358.

Peter

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