[sdiy] op amps [was: Re: TI SN74LS624N, worth buying?]

[Lanterman, Aaron]

> On 11/13/2011 03:19 PM, John Alex Hvidlykke wrote:
>> Op-amps are the workhorses of audio electronics, but they come in a
>> confusing lot of versions. That the 072 and 074 are almost omnipresent I am
>> aware of. But how good are they, compared to other "standard" op-amps? In my
>> box of amps I have several 741's and 1741's, which, as far as I am concerned
>> must be the lowest in the range. Do the 07x compare to them, or are they
>> much better/faster?

One bit of warning - don't necessarily always assume you can replace a 741 (or similar cruddy op amp by modern standards (with a better one). One or two of my students have come across cases where the slow slew of the 741 helped prevent parasitic oscillations - a TL07x in the same spot in the circuit would yield these crazy ultrasonic oscillations that sticking in capacitors wouldn't tame. (This doesn't seem to happen too often, though.)

- Aaron