[sdiy] op amp substitutes

[anthony]

>> Oh I said it was 'technically crappy'. From me that translates to "The
>> datasheet doesn't add up to what I've seen in real world applications.
>
> What parameter did you think missed the data sheet specs. Often people
> claim "too noisy" in a circuit populated with carbon comp resistors and
> electrolytics.  In those cases, its usually the PASSIVE components that
> contribute the
> major amount of noise.  I replace them with metal film and the noise 
> disappears.

I actually meant that they sound BETTER than you'd think from looking at the 
data sheet. From the datasheet it looks a lot like a run of the mill dual op 
amp.

> I reach for the 4558 these days for audio opamps that don't need the high
> impedance
> of the TL07x series.

I like to use them whenever I can because I have more of them than any other 
type by far.


> Keep in mind that 741 and 1458 belong in a sentence, and 324 and 358 
> belong
> in another. They ARE both opamps but are otherwise SO different that you 
> need
> to consider them separatly (wll imho :^)

That is actually how I group them in my mind. I guess maybe instead of 
having a drawer for singles another for doubles and another for quads isn't 
as good of an idea as putting them in drawers by type. I do have a drawer 
just for TL0XX (and other FET op amps like the 4072) and 4558.

Speaking of TL0XX, has anybody had any experience with 03X and 05X compared 
with the usual 074 and 084?

> Single package opamps are ideal for circuits that might otherwise interact 
> with
> the
> adjacent package.

> anyway..) they are fine. AND cheap.  Manufacturers often opt for cheap, 
> not
> good.
>
> Diy'ers don't have to do that...   ;^P

Po' ones do. It's an art unto itself really making what you have work 
instead of buying whatever might work best. I'm fortunate that I've saved 
just about everything that I've collected over the 32 short (or long 
depending on how sick I am in the morning) years. I'm fortunate that I've 
stocked up on resistors and caps. And I have a lot of great IC's. (Well I 
think they're great anyway.)
I'll be back in action soon and then it won't really be a big deal, but the 
extra research I'm making myself do is kind od worth it. (Especially since 
all I have right now is time. Lucky I have that.)

> H^) harry